Typescript: TS7006: Parameter 'xxx' implicitly has an 'any' type

Minimal error reproduction

export const users = require('../data'); // presumes @types/node are installed
const foundUser = users.find(user => user.id === 42); 
// error: Parameter 'user' implicitly has an 'any' type.ts(7006)

Option 1: Explicit user type (simple, no checks)

type User = { id: number; name: string /* and others */ }
const foundUser = users.find((user: User) => user.id === 42)

Option 2: Type guards (middleground)

Type guards are a good middleground between simplicity and strong types:

function isUserArray(maybeUserArr: any): maybeUserArr is Array<User> {
  return Array.isArray(maybeUserArr) && maybeUserArr.every(isUser)
}

function isUser(user: any): user is User {
  return "id" in user && "name" in user
}

if (isUserArray(users)) {
  const foundUser = users.find((user) => user.id === 42)
}

You can even switch to assertion functions (TS 3.7+) to get rid of if and throw an error instead.

function assertIsUserArray(maybeUserArr: any): asserts maybeUserArr is Array<User> {
  if(!isUserArray(maybeUserArr)) throw Error("wrong json type")
}

assertIsUserArray(users)
const foundUser = users.find((user) => user.id === 42) // works

Option 3: Runtime type system library (sophisticated)

A runtime type check library like io-ts or ts-runtime can be integrated for more complex cases.

Not recommended solutions

noImplicitAny: false undermines many useful checks of the type system:

function add(s1, s2) { // s1,s2 implicitely get `any` type
  return s1 * s2 // `any` type allows string multiplication and all sorts of types :(
}
add("foo", 42)

Also better provide an explicit User type for user. This will avoid propagating any to inner layer types. Instead typing and validating is kept in the JSON processing code of the outer API layer.

TypeError: int() argument must be a string, a bytes-like object or a number, not 'list'

What the error is telling, is that you can't convert an entire list into an integer. You could get an index from the list and convert that into an integer:

x = ["0", "1", "2"] 
y = int(x[0]) #accessing the zeroth element

If you're trying to convert a whole list into an integer, you are going to have to convert the list into a string first:

x = ["0", "1", "2"]
y = ''.join(x) # converting list into string
z = int(y)

If your list elements are not strings, you'll have to convert them to strings before using str.join:

x = [0, 1, 2]
y = ''.join(map(str, x))
z = int(y)

Also, as stated above, make sure that you're not returning a nested list.

How to set aliases in the Git Bash for Windows?

Follow below steps:

Open the file .bashrc which is found in location C:\Users\USERNAME\.bashrc

If file .bashrc not exist then create it using below steps:
1. Open Command Prompt and goto C:\Users\USERNAME\.
2. Type command notepad ~/.bashrc
  It generates the .bashrc file.
Add below sample commands of WP CLI, Git, Grunt & PHPCS etc.

# ----------------------
# Git Command Aliases
# ----------------------
alias ga='git add'
alias gaa='git add .'
alias gaaa='git add --all'

# ----------------------
# WP CLI
# ----------------------
alias wpthl='wp theme list'
alias wppll='wp plugin list'

Now you can use the commands:

ga instead of git add .
wpthl instead of wp theme list

Eg. I have used wpthl for the WP CLI command wp theme list.

Yum@M MINGW64 /c/xampp/htdocs/dev.test
$ wpthl
+------------------------+----------+-----------+----------+
| name                   | status   | update    | version  |
+------------------------+----------+-----------+----------+
| twentyeleven           | inactive | none      | 2.8      |
| twentyfifteen          | inactive | none      | 2.0      |
| twentyfourteen         | inactive | none      | 2.2      |
| twentyseventeen        | inactive | available | 1.6      |
| twentysixteen          | inactive | none      | 1.5      |
| twentyten              | inactive | none      | 2.5      |
| twentythirteen         | inactive | none      | 2.4      |
| twentytwelve           | inactive | none      | 2.5      |

For more details read the article Keyboard shortcut/aliases for the WP CLI, Git, Grunt & PHPCS commands for windows

Switch between python 2.7 and python 3.5 on Mac OS X

How to set the python version back to 2.7 if you have installed Anaconda3 (Python 3.6) on MacOS High Sierra 10.13.5

Edit the .bash_profile file in your home directory.

vi $HOME/.bash_profile

hash out the line # export PATH="/Users/YOURUSERNAME/anaconda3/bin:$PATH"

Close the shell open again you should see 2.7 when you run python.

Then if you want 3.6 you can simply uncomment your anaconda3 line in your bash profile.

Trying to unlink python will end in tears in Mac OSX.

You will something like this

unlink: /usr/bin/python: Operation not permitted

Hope that helps someone out !! :) :)

Change the location of the ~ directory in a Windows install of Git Bash

1.Right click to Gitbash shortcut choose Properties
2.Choose "Shortcut" tab
3.Type your starting directory to "Start in" field
4.Remove "--cd-to-home" part from "Target" field

A better way to check if a path exists or not in PowerShell

Add the following aliases. I think these should be made available in PowerShell by default:

function not-exist { -not (Test-Path $args) }
Set-Alias !exist not-exist -Option "Constant, AllScope"
Set-Alias exist Test-Path -Option "Constant, AllScope"

With that, the conditional statements will change to:

if (exist $path) { ... }

and

if (not-exist $path) { ... }
if (!exist $path) { ... }

how to rename an index in a cluster?

If you can't REINDEX a workaround is to use aliases. From the official documentation:

APIs in elasticsearch accept an index name when working against a specific index, and several indices when applicable. The index aliases API allow to alias an index with a name, with all APIs automatically converting the alias name to the actual index name. An alias can also be mapped to more than one index, and when specifying it, the alias will automatically expand to the aliases indices. An alias can also be associated with a filter that will automatically be applied when searching, and routing values. An alias cannot have the same name as an index.

Be aware that this solution does not work if you're using More Like This feature. https://github.com/elastic/elasticsearch/issues/16560

How to create permanent PowerShell Aliases

Open a Windows PowerShell window and type:

notepad $profile

Then create a function, such as:

function goSomewhereThenOpenGoogleThenDeleteSomething {
    cd C:\Users\
    Start-Process -FilePath "http://www.google.com"
    rm fileName.txt
}

Then type this under the function name:

Set-Alias google goSomewhereThenOpenGoogleThenDeleteSomething

Now you can type the word "google" into Windows PowerShell and have it execute the code within your function!

How to remove a package from Laravel using composer?

Remove package folder from vendor folder (Manual delete)
remove it from 'composer.json' & 'composer.lock' files
remove it from 'config/app.php' & 'bootstrap/cache/config.php' files
composer remove package-name
php artisan cache:clear & php artisan config:clear

Vagrant error : Failed to mount folders in Linux guest

I arrived at this page whilst looking for the same error message. For me the cause was different: I had ran a yum update on the system that installed a new kernel. The guest additions where out of date so it couldn't load them.

I rebuilt them with

sudo /etc/init.d/vboxadd setup

And a vagrant reload later my guest was up and running again.

I'm just adding it here in case someone else gets here the same way I did.

Edit (Per KCD's comment):
It is possible that you get an error saying:

The headers for the current running kernel were not found

This can be resolved by installing kernel-devel (yum install kernel-devel)

Aliases in Windows command prompt

Using doskey is the right way to do this, but it resets when the Command Prompt window is closed. You need to add that line to something like .bashrc equivalent. So I did the following:

Add "C:\Program Files (x86)\Notepad++" to system path variable
Make a copy of notepad++.exe (in the same folder, of course) and rename it to np.exe

Works just fine!

Is there a difference between PhoneGap and Cordova commands?

I have also noticed that cordova has a "serve" command that Phonegap doesn't. This command launches a local server on port 8000. This is handy for running your app in Chrome and using the Ripple emulator.

How to alias a table in Laravel Eloquent queries (or using Query Builder)?

Same as AMIB answer, for soft delete error "Unknown column 'table_alias.deleted_at'", just add ->withTrashed() then handle it yourself like ->whereRaw('items_alias.deleted_at IS NULL')

how to pass variable from shell script to sqlplus

You appear to have a heredoc containing a single SQL*Plus command, though it doesn't look right as noted in the comments. You can either pass a value in the heredoc:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql BUILDING
exit;
EOF

or if BUILDING is $2 in your script:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql $2
exit;
EOF

If your file.sql had an exit at the end then it would be even simpler as you wouldn't need the heredoc:

sqlplus -S user/pass@localhost @/opt/D2RQ/file.sql $2

In your SQL you can then refer to the position parameters using substitution variables:

...
}',SEM_Models('&1'),NULL,
...

The &1 will be replaced with the first value passed to the SQL script, BUILDING; because that is a string it still needs to be enclosed in quotes. You might want to set verify off to stop if showing you the substitutions in the output.

You can pass multiple values, and refer to them sequentially just as you would positional parameters in a shell script - the first passed parameter is &1, the second is &2, etc. You can use substitution variables anywhere in the SQL script, so they can be used as column aliases with no problem - you just have to be careful adding an extra parameter that you either add it to the end of the list (which makes the numbering out of order in the script, potentially) or adjust everything to match:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql total_count BUILDING
exit;
EOF

or:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql total_count $2
exit;
EOF

If total_count is being passed to your shell script then just use its positional parameter, $4 or whatever. And your SQL would then be:

SELECT COUNT(*) as &1
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&2'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

If you pass a lot of values you may find it clearer to use the positional parameters to define named parameters, so any ordering issues are all dealt with at the start of the script, where they are easier to maintain:

define MY_ALIAS = &1
define MY_MODEL = &2

SELECT COUNT(*) as &MY_ALIAS
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&MY_MODEL'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

From your separate question, maybe you just wanted:

SELECT COUNT(*) as &1
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&1'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

... so the alias will be the same value you're querying on (the value in $2, or BUILDING in the original part of the answer). You can refer to a substitution variable as many times as you want.

That might not be easy to use if you're running it multiple times, as it will appear as a header above the count value in each bit of output. Maybe this would be more parsable later:

select '&1' as QUERIED_VALUE, COUNT(*) as TOTAL_COUNT

If you set pages 0 and set heading off, your repeated calls might appear in a neat list. You might also need to set tab off and possibly use rpad('&1', 20) or similar to make that column always the same width. Or get the results as CSV with:

select '&1' ||','|| COUNT(*)

Depends what you're using the results for...

Dealing with "Xerces hell" in Java/Maven?

Every maven project should stop depending on xerces, they probably don't really. XML APIs and an Impl has been part of Java since 1.4. There is no need to depend on xerces or XML APIs, its like saying you depend on Java or Swing. This is implicit.

If I was boss of a maven repo I'd write a script to recursively remove xerces dependencies and write a read me that says this repo requires Java 1.4.

Anything that actually breaks because it references Xerces directly via org.apache imports needs a code fix to bring it up to Java 1.4 level (and has done since 2002) or solution at JVM level via endorsed libs, not in maven.

Error message "Forbidden You don't have permission to access / on this server"

I had the same issue for a specific controller only - which was really weird. I had a folder in the root of the CI folder that had the same name as the controller I was trying to access... Because of that, CI was directing the request to this directory instead of the controller itself.

After removing this folder (which was there a bit by mistake), it all worked fine.

To be more clear, here is what it looked like:

/ci/controller/register.php

/ci/register/

I had to remove /ci/register/.

Best way to get child nodes

firstElementChild might not be available in IE<9 (only firstChild)

on IE<9 firstChild is the firstElementChild because MS DOM (IE<9) is not storing empty text nodes. But if you do so on other browsers they will return empty text nodes...

my solution

child=(elem.firstElementChild||elem.firstChild)

this will give the firstchild even on IE<9

How do I use Apache tomcat 7 built in Host Manager gui?

For tomcat 8

1.Go to context.xml file located for instance../home/ubuntu/tomcat/webapps/manager/META-INF/

comment out valve tag. save and exit

2.Go to tomcat-users.xml file located in conf directory of tomcat. Add the respective roles

under the tomcat-users tag. Save and exit.

Restart the tomcat.

Now, you will be able to have access to the manager app.

How do I run a shell script without using "sh" or "bash" commands?

Enter "#!/bin/sh" before script. Then save it as script.sh for example. copy it to $HOME/bin or $HOME/usr/bin
The directory can be different on different linux distros but they end with 'bin' and are in home directory cd $HOME/bin or $HOME/usr/bin
Type chmod 700 script.sh
And you can run it just by typing run.sh on terminal. If it not work, try chmod +x run.sh instead of chmod 700 run.sh

Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?

The following is the un-installation for PostgreSQL 9.1 installed using the EnterpriseDB installer. You most probably have to replace folder /9.1/ with your version number. If /Library/Postgresql/ doesn't exist then you probably installed PostgreSQL with a different method like homebrew or Postgres.app.

To remove the EnterpriseDB One-Click install of PostgreSQL 9.1:

Open a terminal window. Terminal is found in: Applications->Utilities->Terminal
Run the uninstaller:
```
sudo /Library/PostgreSQL/9.1/uninstall-postgresql.app/Contents/MacOS/installbuilder.sh
```
If you installed with the Postgres Installer, you can do:
```
open /Library/PostgreSQL/9.2/uninstall-postgresql.app
```
It will ask for the administrator password and run the uninstaller.
Remove the PostgreSQL and data folders. The Wizard will notify you that these were not removed.
```
sudo rm -rf /Library/PostgreSQL
```
Remove the ini file:
```
sudo rm /etc/postgres-reg.ini
```
Remove the PostgreSQL user using System Preferences -> Users & Groups.
1. Unlock the settings panel by clicking on the padlock and entering your password.
2. Select the PostgreSQL user and click on the minus button.
Restore your shared memory settings:
```
sudo rm /etc/sysctl.conf
```

That should be all! The uninstall wizard would have removed all icons and start-up applications files so you don't have to worry about those.

phpMyAdmin + CentOS 6.0 - Forbidden

Non of the above mentioned solutions worked for me. Below is what finally worked:

#yum update
#yum install phpmyadmin

Be advised, phpmyadmin was working a few hours earlier. I don't know what happened.

After this, going to the browser, I got an error that said ./config.inic.php can't be accessed

#cd /usr/share/phpmyadmin/
#stat -c %a config.inic.php
#640
#chmod 644 config.inic.php

This shows that the file permissions were 640, then I changed them to 644. Finially, it worked.

Remember to restart httpd.

#service httpd restart

List Git aliases

Both Works Well

1 - Using Get Regex

$ git config --get-regexp alias

2 - Using list

$ git config --list | grep alias

Git for Windows: .bashrc or equivalent configuration files for Git Bash shell

for gitbash in windows10 look out for the config file in

/.gitconfig file

InvalidKeyException : Illegal Key Size - Java code throwing exception for encryption class - how to fix?

Add below code in your client code :

static {
    Security.insertProviderAt(new BouncyCastleProvider(),1);
 }

with this there is no need to add any entry in java.security file.

What's the purpose of SQL keyword "AS"?

When you aren't sure which syntax to choose, especially when there doesn't seem to be much to separate the choices, consult a book on heuristics. As far as I know, the only heuristics book for SQL is 'Joe Celko's SQL Programming Style':

A correlation name is more often called an alias, but I will be formal. In SQL-92, they can have an optional AS operator, and it should be used to make it clear that something is being given a new name. [p16]

This way, if your team doesn't like the convention, you can blame Celko -- I know I do ;)

UPDATE 1: IIRC for a long time, Oracle did not support the AS (preceding correlation name) keyword, which may explain why some old timers don't use it habitually.

UPDATE 2: the term 'correlation name', although used by the SQL Standard, is inappropriate. The underlying concept is that of a ‘range variable’.

UPDATE 3: I just re-read what Celko wrote and he is wrong: the table is not being renamed! I now think:

A correlation name is more often called an alias, but I will be formal. In Standard SQL they can have an optional AS keyword but it should not be used because it may give the impression that something is being renamed when it is not. In fact, it should be omitted to enforce the point that it is a range variable.

Getting list of Facebook friends with latest API

in the recent version of facebook sdk , facebook has disabled the feature that let you access some one friends list due to security reasons ... check the documentation to learn more ...

In Bash, how to add "Are you sure [Y/n]" to any command or alias?

Not the same, but idea that works anyway.

#!/bin/bash  
i='y'  
while [ ${i:0:1} != n ]  
do  
    # Command(s)  
    read -p " Again? Y/n " i  
    [[ ${#i} -eq 0 ]] && i='y'  
done

Output:
Again? Y/n N
Again? Y/n Anything
Again? Y/n 7
Again? Y/n &
Again? Y/n nsijf
$

Now only checks 1st character of $i read.

no such file to load -- rubygems (LoadError)

In case anyone else is googling this problem: I was able to fix mine by finding the elusive "rubygems" folder that I wanted to use and adding it to my $RUBYLIB environment variable.

find / -name "rubygems" -print

Once you find it, add the parent directory to your environment. In bash, like so:

export RUBYLIB=/path/to/parent

Now if you run gem, it should pick up the right library directory, and you're off and running.

Define an alias in fish shell

fish starts by executing commands in ~/.config/fish/config.fish. You can create it if it does not exist:

vim ~/.config/fish/config.fish

and save it with :wq

step1. make configuration file (like .bashrc)

config.fish

step2. just write your alias like this;

alias rm="rm -i"

What exactly is "exit" in PowerShell?

It's a reserved keyword (like return, filter, function, break).

Reference

Also, as per Section 7.6.4 of Bruce Payette's Powershell in Action:

But what happens when you want a script to exit from within a function defined in that script? ... To make this easier, Powershell has the exit keyword.

Of course, as other have pointed out, it's not hard to do what you want by wrapping exit in a function:

PS C:\> function ex{exit}
PS C:\> new-alias ^D ex

MSBuild doesn't copy references (DLL files) if using project dependencies in solution

I just deal with it like this. Go to the properties of your reference and do this:

Set "Copy local = false"
Save
Set "Copy local = true"
Save

and that's it.

Visual Studio 2010 doesn't initially put: <private>True</private> in the reference tag and setting "copy local" to false causes it to create the tag. Afterwards it will set it to true and false accordingly.

Meaning of tilde in Linux bash (not home directory)

It's possible you're seeing OpenDirectory/ActiveDirectory/LDAP users "automounted" into your home directory.

In *nix, ~ will resolve to your home directory. Likewise ~X will resolve to 'user X'.

Similar to automount for directories, OpenDirectory/ActiveDirectory/LDAP is used in larger/corporate environments to automount user directories. These users may be actual people or they can be machine accounts created to provide various features.

If you type ~Tab you'll see a list of the users on your machine.

Linux command to list all available commands and aliases

Add to .bashrc

function ListAllCommands
{
    echo -n $PATH | xargs -d : -I {} find {} -maxdepth 1 \
        -executable -type f -printf '%P\n' | sort -u
}

If you also want aliases, then:

function ListAllCommands
{
    COMMANDS=`echo -n $PATH | xargs -d : -I {} find {} -maxdepth 1 \
        -executable -type f -printf '%P\n'`
    ALIASES=`alias | cut -d '=' -f 1`
    echo "$COMMANDS"$'\n'"$ALIASES" | sort -u
}

How to pass command line arguments to a shell alias?

The easiest way, is to use function not alias. you can still call a function at any time from the cli. In bash, you can just add function name() { command } it loads the same as an alias.

function mkcd() { mkdir $1; cd $1 ;}

Not sure about other shells

About .bash_profile, .bashrc, and where should alias be written in?

Check out http://mywiki.wooledge.org/DotFiles for an excellent resource on the topic aside from man bash.

Summary:

You only log in once, and that's when ~/.bash_profile or ~/.profile is read and executed. Since everything you run from your login shell inherits the login shell's environment, you should put all your environment variables in there. Like LESS, PATH, MANPATH, LC_*, ... For an example, see: My .profile
Once you log in, you can run several more shells. Imagine logging in, running X, and in X starting a few terminals with bash shells. That means your login shell started X, which inherited your login shell's environment variables, which started your terminals, which started your non-login bash shells. Your environment variables were passed along in the whole chain, so your non-login shells don't need to load them anymore. Non-login shells only execute ~/.bashrc, not /.profile or ~/.bash_profile, for this exact reason, so in there define everything that only applies to bash. That's functions, aliases, bash-only variables like HISTSIZE (this is not an environment variable, don't export it!), shell options with set and shopt, etc. For an example, see: My .bashrc
Now, as part of UNIX peculiarity, a login-shell does NOT execute ~/.bashrc but only ~/.profile or ~/.bash_profile, so you should source that one manually from the latter. You'll see me do that in my ~/.profile too: source ~/.bashrc.

What's the difference between .bashrc, .bash_profile, and .environment?

A good place to look at is the man page of bash. Here's an online version. Look for "INVOCATION" section.

Parsing JSON using Json.net

You use the JSON class and then call the GetData() function.

/// <summary>
/// This class encodes and decodes JSON strings.
/// Spec. details, see http://www.json.org/
///
/// JSON uses Arrays and Objects. These correspond here to the datatypes ArrayList and Hashtable.
/// All numbers are parsed to doubles.
/// </summary>
    using System;
    using System.Collections;
    using System.Globalization;
    using System.Text;

public class JSON
{
    public const int TOKEN_NONE = 0;
    public const int TOKEN_CURLY_OPEN = 1;
    public const int TOKEN_CURLY_CLOSE = 2;
    public const int TOKEN_SQUARED_OPEN = 3;
    public const int TOKEN_SQUARED_CLOSE = 4;
    public const int TOKEN_COLON = 5;
    public const int TOKEN_COMMA = 6;
    public const int TOKEN_STRING = 7;
    public const int TOKEN_NUMBER = 8;
    public const int TOKEN_TRUE = 9;
    public const int TOKEN_FALSE = 10;
    public const int TOKEN_NULL = 11;

    private const int BUILDER_CAPACITY = 2000;

    /// <summary>
    /// Parses the string json into a value
    /// </summary>
    /// <param name="json">A JSON string.</param>
    /// <returns>An ArrayList, a Hashtable, a double, a string, null, true, or false</returns>
    public static object JsonDecode(string json)
    {
        bool success = true;

        return JsonDecode(json, ref success);
    }

    /// <summary>
    /// Parses the string json into a value; and fills 'success' with the successfullness of the parse.
    /// </summary>
    /// <param name="json">A JSON string.</param>
    /// <param name="success">Successful parse?</param>
    /// <returns>An ArrayList, a Hashtable, a double, a string, null, true, or false</returns>
    public static object JsonDecode(string json, ref bool success)
    {
        success = true;
        if (json != null) {
            char[] charArray = json.ToCharArray();
            int index = 0;
            object value = ParseValue(charArray, ref index, ref success);
            return value;
        } else {
            return null;
        }
    }

    /// <summary>
    /// Converts a Hashtable / ArrayList object into a JSON string
    /// </summary>
    /// <param name="json">A Hashtable / ArrayList</param>
    /// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
    public static string JsonEncode(object json)
    {
        StringBuilder builder = new StringBuilder(BUILDER_CAPACITY);
        bool success = SerializeValue(json, builder);
        return (success ? builder.ToString() : null);
    }

    protected static Hashtable ParseObject(char[] json, ref int index, ref bool success)
    {
        Hashtable table = new Hashtable();
        int token;

        // {
        NextToken(json, ref index);

        bool done = false;
        while (!done) {
            token = LookAhead(json, index);
            if (token == JSON.TOKEN_NONE) {
                success = false;
                return null;
            } else if (token == JSON.TOKEN_COMMA) {
                NextToken(json, ref index);
            } else if (token == JSON.TOKEN_CURLY_CLOSE) {
                NextToken(json, ref index);
                return table;
            } else {

                // name
                string name = ParseString(json, ref index, ref success);
                if (!success) {
                    success = false;
                    return null;
                }

                // :
                token = NextToken(json, ref index);
                if (token != JSON.TOKEN_COLON) {
                    success = false;
                    return null;
                }

                // value
                object value = ParseValue(json, ref index, ref success);
                if (!success) {
                    success = false;
                    return null;
                }

                table[name] = value;
            }
        }

        return table;
    }

    protected static ArrayList ParseArray(char[] json, ref int index, ref bool success)
    {
        ArrayList array = new ArrayList();

        // [
        NextToken(json, ref index);

        bool done = false;
        while (!done) {
            int token = LookAhead(json, index);
            if (token == JSON.TOKEN_NONE) {
                success = false;
                return null;
            } else if (token == JSON.TOKEN_COMMA) {
                NextToken(json, ref index);
            } else if (token == JSON.TOKEN_SQUARED_CLOSE) {
                NextToken(json, ref index);
                break;
            } else {
                object value = ParseValue(json, ref index, ref success);
                if (!success) {
                    return null;
                }

                array.Add(value);
            }
        }

        return array;
    }

    protected static object ParseValue(char[] json, ref int index, ref bool success)
    {
        switch (LookAhead(json, index)) {
            case JSON.TOKEN_STRING:
                return ParseString(json, ref index, ref success);
            case JSON.TOKEN_NUMBER:
                return ParseNumber(json, ref index, ref success);
            case JSON.TOKEN_CURLY_OPEN:
                return ParseObject(json, ref index, ref success);
            case JSON.TOKEN_SQUARED_OPEN:
                return ParseArray(json, ref index, ref success);
            case JSON.TOKEN_TRUE:
                NextToken(json, ref index);
                return true;
            case JSON.TOKEN_FALSE:
                NextToken(json, ref index);
                return false;
            case JSON.TOKEN_NULL:
                NextToken(json, ref index);
                return null;
            case JSON.TOKEN_NONE:
                break;
        }

        success = false;
        return null;
    }

    protected static string ParseString(char[] json, ref int index, ref bool success)
    {
        StringBuilder s = new StringBuilder(BUILDER_CAPACITY);
        char c;

        EatWhitespace(json, ref index);

        // "
        c = json[index++];

        bool complete = false;
        while (!complete) {

            if (index == json.Length) {
                break;
            }

            c = json[index++];
            if (c == '"') {
                complete = true;
                break;
            } else if (c == '\\') {

                if (index == json.Length) {
                    break;
                }
                c = json[index++];
                if (c == '"') {
                    s.Append('"');
                } else if (c == '\\') {
                    s.Append('\\');
                } else if (c == '/') {
                    s.Append('/');
                } else if (c == 'b') {
                    s.Append('\b');
                } else if (c == 'f') {
                    s.Append('\f');
                } else if (c == 'n') {
                    s.Append('\n');
                } else if (c == 'r') {
                    s.Append('\r');
                } else if (c == 't') {
                    s.Append('\t');
                } else if (c == 'u') {
                    int remainingLength = json.Length - index;
                    if (remainingLength >= 4) {
                        // parse the 32 bit hex into an integer codepoint
                        uint codePoint;
                        if (!(success = UInt32.TryParse(new string(json, index, 4), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out codePoint))) {
                            return "";
                        }
                        // convert the integer codepoint to a unicode char and add to string
                        s.Append(Char.ConvertFromUtf32((int)codePoint));
                        // skip 4 chars
                        index += 4;
                    } else {
                        break;
                    }
                }

            } else {
                s.Append(c);
            }

        }

        if (!complete) {
            success = false;
            return null;
        }

        return s.ToString();
    }

    protected static double ParseNumber(char[] json, ref int index, ref bool success)
    {
        EatWhitespace(json, ref index);

        int lastIndex = GetLastIndexOfNumber(json, index);
        int charLength = (lastIndex - index) + 1;

        double number;
        success = Double.TryParse(new string(json, index, charLength), NumberStyles.Any, CultureInfo.InvariantCulture, out number);

        index = lastIndex + 1;
        return number;
    }

    protected static int GetLastIndexOfNumber(char[] json, int index)
    {
        int lastIndex;

        for (lastIndex = index; lastIndex < json.Length; lastIndex++) {
            if ("0123456789+-.eE".IndexOf(json[lastIndex]) == -1) {
                break;
            }
        }
        return lastIndex - 1;
    }

    protected static void EatWhitespace(char[] json, ref int index)
    {
        for (; index < json.Length; index++) {
            if (" \t\n\r".IndexOf(json[index]) == -1) {
                break;
            }
        }
    }

    protected static int LookAhead(char[] json, int index)
    {
        int saveIndex = index;
        return NextToken(json, ref saveIndex);
    }

    protected static int NextToken(char[] json, ref int index)
    {
        EatWhitespace(json, ref index);

        if (index == json.Length) {
            return JSON.TOKEN_NONE;
        }

        char c = json[index];
        index++;
        switch (c) {
            case '{':
                return JSON.TOKEN_CURLY_OPEN;
            case '}':
                return JSON.TOKEN_CURLY_CLOSE;
            case '[':
                return JSON.TOKEN_SQUARED_OPEN;
            case ']':
                return JSON.TOKEN_SQUARED_CLOSE;
            case ',':
                return JSON.TOKEN_COMMA;
            case '"':
                return JSON.TOKEN_STRING;
            case '0': case '1': case '2': case '3': case '4':
            case '5': case '6': case '7': case '8': case '9':
            case '-':
                return JSON.TOKEN_NUMBER;
            case ':':
                return JSON.TOKEN_COLON;
        }
        index--;

        int remainingLength = json.Length - index;

        // false
        if (remainingLength >= 5) {
            if (json[index] == 'f' &&
                json[index + 1] == 'a' &&
                json[index + 2] == 'l' &&
                json[index + 3] == 's' &&
                json[index + 4] == 'e') {
                index += 5;
                return JSON.TOKEN_FALSE;
            }
        }

        // true
        if (remainingLength >= 4) {
            if (json[index] == 't' &&
                json[index + 1] == 'r' &&
                json[index + 2] == 'u' &&
                json[index + 3] == 'e') {
                index += 4;
                return JSON.TOKEN_TRUE;
            }
        }

        // null
        if (remainingLength >= 4) {
            if (json[index] == 'n' &&
                json[index + 1] == 'u' &&
                json[index + 2] == 'l' &&
                json[index + 3] == 'l') {
                index += 4;
                return JSON.TOKEN_NULL;
            }
        }

        return JSON.TOKEN_NONE;
    }

    protected static bool SerializeValue(object value, StringBuilder builder)
    {
        bool success = true;

        if (value is string) {
            success = SerializeString((string)value, builder);
        } else if (value is Hashtable) {
            success = SerializeObject((Hashtable)value, builder);
        } else if (value is ArrayList) {
            success = SerializeArray((ArrayList)value, builder);
        } else if ((value is Boolean) && ((Boolean)value == true)) {
            builder.Append("true");
        } else if ((value is Boolean) && ((Boolean)value == false)) {
            builder.Append("false");
        } else if (value is ValueType) {
            // thanks to ritchie for pointing out ValueType to me
            success = SerializeNumber(Convert.ToDouble(value), builder);
        } else if (value == null) {
            builder.Append("null");
        } else {
            success = false;
        }
        return success;
    }

    protected static bool SerializeObject(Hashtable anObject, StringBuilder builder)
    {
        builder.Append("{");

        IDictionaryEnumerator e = anObject.GetEnumerator();
        bool first = true;
        while (e.MoveNext()) {
            string key = e.Key.ToString();
            object value = e.Value;

            if (!first) {
                builder.Append(", ");
            }

            SerializeString(key, builder);
            builder.Append(":");
            if (!SerializeValue(value, builder)) {
                return false;
            }

            first = false;
        }

        builder.Append("}");
        return true;
    }

    protected static bool SerializeArray(ArrayList anArray, StringBuilder builder)
    {
        builder.Append("[");

        bool first = true;
        for (int i = 0; i < anArray.Count; i++) {
            object value = anArray[i];

            if (!first) {
                builder.Append(", ");
            }

            if (!SerializeValue(value, builder)) {
                return false;
            }

            first = false;
        }

        builder.Append("]");
        return true;
    }

    protected static bool SerializeString(string aString, StringBuilder builder)
    {
        builder.Append("\"");

        char[] charArray = aString.ToCharArray();
        for (int i = 0; i < charArray.Length; i++) {
            char c = charArray[i];
            if (c == '"') {
                builder.Append("\\\"");
            } else if (c == '\\') {
                builder.Append("\\\\");
            } else if (c == '\b') {
                builder.Append("\\b");
            } else if (c == '\f') {
                builder.Append("\\f");
            } else if (c == '\n') {
                builder.Append("\\n");
            } else if (c == '\r') {
                builder.Append("\\r");
            } else if (c == '\t') {
                builder.Append("\\t");
            } else {
                int codepoint = Convert.ToInt32(c);
                if ((codepoint >= 32) && (codepoint <= 126)) {
                    builder.Append(c);
                } else {
                    builder.Append("\\u" + Convert.ToString(codepoint, 16).PadLeft(4, '0'));
                }
            }
        }

        builder.Append("\"");
        return true;
    }

    protected static bool SerializeNumber(double number, StringBuilder builder)
    {
        builder.Append(Convert.ToString(number, CultureInfo.InvariantCulture));
        return true;
    }
}

//parse and show entire json in key-value pair
    Hashtable HTList = (Hashtable)JSON.JsonDecode("completejsonstring");
        public void GetData(Hashtable HT)
        {           
            IDictionaryEnumerator ienum = HT.GetEnumerator();
            while (ienum.MoveNext())
            {
                if (ienum.Value is ArrayList)
                {
                    ArrayList arnew = (ArrayList)ienum.Value;
                    foreach (object obj in arnew)                    
                    {
                        Hashtable hstemp = (Hashtable)obj;
                        GetData(hstemp);
                    }
                }
                else
                {
                    Console.WriteLine(ienum.Key + "=" + ienum.Value);
                }
            }
        }

How to detect the OS from a Bash script?

This should be safe to use on all distros.

$ cat /etc/*release

This produces something like this.

     DISTRIB_ID=LinuxMint
     DISTRIB_RELEASE=17
     DISTRIB_CODENAME=qiana
     DISTRIB_DESCRIPTION="Linux Mint 17 Qiana"
     NAME="Ubuntu"
     VERSION="14.04.1 LTS, Trusty Tahr"
     ID=ubuntu
     ID_LIKE=debian
     PRETTY_NAME="Ubuntu 14.04.1 LTS"
     VERSION_ID="14.04"
     HOME_URL="http://www.ubuntu.com/"
     SUPPORT_URL="http://help.ubuntu.com/"
     BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

Extract/assign to variables as you wish

Note: On some setups. This may also give you some errors that you can ignore.

     cat: /etc/upstream-release: Is a directory

Best way to compare 2 XML documents in Java

Below code works for me

String xml1 = ...
String xml2 = ...
XMLUnit.setIgnoreWhitespace(true);
XMLUnit.setIgnoreAttributeOrder(true);
XMLAssert.assertXMLEqual(actualxml, xmlInDb);

How to return multiple values in one column (T-SQL)?

Well... I see that an answer was already accepted... but I think you should see another solutions anyway:

/* EXAMPLE */
DECLARE @UserAliases TABLE(UserId INT , Alias VARCHAR(10))
INSERT INTO @UserAliases (UserId,Alias) SELECT 1,'MrX'
     UNION ALL SELECT 1,'MrY' UNION ALL SELECT 1,'MrA'
     UNION ALL SELECT 2,'Abc' UNION ALL SELECT 2,'Xyz'

/* QUERY */
;WITH tmp AS ( SELECT DISTINCT UserId FROM @UserAliases )
SELECT 
    LEFT(tmp.UserId, 10) +
    '/ ' +
    STUFF(
            (   SELECT ', '+Alias 
                FROM @UserAliases 
                WHERE UserId = tmp.UserId 
                FOR XML PATH('') 
            ) 
            , 1, 2, ''
        ) AS [UserId/Alias]
FROM tmp

/* -- OUTPUT
  UserId/Alias
  1/ MrX, MrY, MrA
  2/ Abc, Xyz    
*/

Virtual network interface in Mac OS X

Go to Network Preferences.

At the bottom of the list of network adapters, click the + icons

Select the existing interface that you want to arp (say Ethernet 1), and give the Service Name that you want for the new port (say Ethernet 1.1) then press create.

Now you have the new virtual interface in the gui and can manage IP addresses etc it in the normal way.

ifconfig -a will confirm that you have multiple IPs on the interface, and these will still be there when you reboot.

Its a Mac. Don't fight it, do it the easy way.

Best way to convert text files between character sets?

Try EncodingChecker

EncodingChecker on github

File Encoding Checker is a GUI tool that allows you to validate the text encoding of one or more files. The tool can display the encoding for all selected files, or only the files that do not have the encodings you specify.

File Encoding Checker requires .NET 4 or above to run.

For encoding detection, File Encoding Checker uses the UtfUnknown Charset Detector library. UTF-16 text files without byte-order-mark (BOM) can be detected by heuristics.

Hidden Features of C#?

I see a lot of people replicate the functionality of Nullable<T>.GetValueOrDefault(T).

how to make div click-able?

As you updated your question, here's an obtrustive example:

window.onload = function()
{
    var div = document.getElementById("mydiv");

    div.style.cursor = 'pointer';
    div.onmouseover = function()
    {
        div.style.background = "#ff00ff";
    };
}

break statement in "if else" - java

Because your else isn't attached to anything. The if without braces only encompasses the single statement that immediately follows it.

if (choice==5)
{
    System.out.println("End of Game\n Thank you for playing with us!");
    break;
}
else
{
   System.out.println("Not a valid choice!\n Please try again...\n");
}

Not using braces is generally viewed as a bad practice because it can lead to the exact problems you encountered.

In addition, using a switch here would make more sense.

int choice;
boolean keepGoing = true;
while(keepGoing)
{
    System.out.println("---> Your choice: ");
    choice = input.nextInt();
    switch(choice)
    {
        case 1: 
            playGame();
            break;
        case 2: 
            loadGame();
            break;
        // your other cases
        // ...
        case 5: 
            System.out.println("End of Game\n Thank you for playing with us!");
            keepGoing = false;
            break;
        default:
            System.out.println("Not a valid choice!\n Please try again...\n");
     }
 }

Note that instead of an infinite for loop I used a while(boolean), making it easy to exit the loop. Another approach would be using break with labels.

How do I change the data type for a column in MySQL?

You use the alter table ... change ... method, for example:

mysql> create table yar (id int);
Query OK, 0 rows affected (0.01 sec)

mysql> insert into yar values(5);
Query OK, 1 row affected (0.01 sec)

mysql> alter table yar change id id varchar(255);
Query OK, 1 row affected (0.03 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql> desc yar;
+-------+--------------+------+-----+---------+-------+
| Field | Type         | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| id    | varchar(255) | YES  |     | NULL    |       |
+-------+--------------+------+-----+---------+-------+
1 row in set (0.00 sec)

Create a simple HTTP server with Java?

Embedding Tomcat is relatively painless as such things go. Here's a good StackOverflow reference about it.

Check if item is in an array / list

You have to use .values for arrays. for example say you have dataframe which has a column name ie, test['Name'], you can do

if name in test['Name'].values :
   print(name)

for a normal list you dont have to use .values

Prevent direct access to a php include file

I had this problem once, solved with:

if (strpos($_SERVER['REQUEST_URI'], basename(__FILE__)) !== false) ...

but the ideal solution is to place the file outside of the web-server document root, as mentioned in another anwser.

Calling class staticmethod within the class body?

This is due to staticmethod being a descriptor and requires a class-level attribute fetch to exercise the descriptor protocol and get the true callable.

From the source code:

It can be called either on the class (e.g. C.f()) or on an instance (e.g. C().f()); the instance is ignored except for its class.

But not directly from inside the class while it is being defined.

But as one commenter mentioned, this is not really a "Pythonic" design at all. Just use a module level function instead.

How to require a controller in an angularjs directive

There is a good stackoverflow answer here by Mark Rajcok:

AngularJS directive controllers requiring parent directive controllers?

with a link to this very clear jsFiddle: http://jsfiddle.net/mrajcok/StXFK/

<div ng-controller="MyCtrl">
    <div screen>
        <div component>
            <div widget>
                <button ng-click="widgetIt()">Woo Hoo</button>
            </div>
        </div>
    </div>
</div>

JavaScript

var myApp = angular.module('myApp',[])

.directive('screen', function() {
    return {
        scope: true,
        controller: function() {
            this.doSomethingScreeny = function() {
                alert("screeny!");
            }
        }
    }
})

.directive('component', function() {
    return {
        scope: true,
        require: '^screen',
        controller: function($scope) {
            this.componentFunction = function() {
                $scope.screenCtrl.doSomethingScreeny();
            }
        },
        link: function(scope, element, attrs, screenCtrl) {
            scope.screenCtrl = screenCtrl
        }
    }
})

.directive('widget', function() {
    return {
        scope: true,
        require: "^component",
        link: function(scope, element, attrs, componentCtrl) {
            scope.widgetIt = function() {
                componentCtrl.componentFunction();
            };
        }
    }
})


//myApp.directive('myDirective', function() {});
//myApp.factory('myService', function() {});

function MyCtrl($scope) {
    $scope.name = 'Superhero';
}

How do I get the currently displayed fragment?

SQL update fields of one table from fields of another one

Try Following

Update A a, B b, SET a.column1=b.column1 where b.id=1

EDITED:- Update more than one column

Update A a, B b, SET a.column1=b.column1, a.column2=b.column2 where b.id=1

data.frame Group By column

Using dplyr:

require(dplyr)    
df <- data.frame(A = c(1, 1, 2, 3, 3), B = c(2, 3, 3, 5, 6))
df %>% group_by(A) %>% summarise(B = sum(B))

## Source: local data frame [3 x 2]
## 
##   A  B
## 1 1  5
## 2 2  3
## 3 3 11

With sqldf:

library(sqldf)
sqldf('SELECT A, SUM(B) AS B FROM df GROUP BY A')

Can I force a UITableView to hide the separator between empty cells?

Setting the table's separatorStyle to UITableViewCellSeparatorStyleNone (in code or in IB) should do the trick.

How to pick an image from gallery (SD Card) for my app?

public class BrowsePictureActivity extends Activity {
private static final int SELECT_PICTURE = 1;

private String selectedImagePath;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ((Button) findViewById(R.id.Button01))
            .setOnClickListener(new OnClickListener() {

                public void onClick(View arg0) {

                    Intent intent = new Intent();
                    intent.setType("image/*");
                    intent.setAction(Intent.ACTION_GET_CONTENT);
                    startActivityForResult(Intent.createChooser(intent,
                            "Select Picture"), SELECT_PICTURE);
                }
            });
}

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == SELECT_PICTURE) {
            Uri selectedImageUri = data.getData();
            selectedImagePath = getPath(selectedImageUri);
        }
    }
}

public String getPath(Uri uri) {

        if( uri == null ) {
            return null;
        }

        // this will only work for images selected from gallery
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if( cursor != null ){
            int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        }

        return uri.getPath();
}

}

How to sort a collection by date in MongoDB?

Sorting by date doesn't require anything special. Just sort by the desired date field of the collection.

Updated for the 1.4.28 node.js native driver, you can sort ascending on datefield using any of the following ways:

collection.find().sort({datefield: 1}).toArray(function(err, docs) {...});
collection.find().sort('datefield', 1).toArray(function(err, docs) {...});
collection.find().sort([['datefield', 1]]).toArray(function(err, docs) {...});
collection.find({}, {sort: {datefield: 1}}).toArray(function(err, docs) {...});
collection.find({}, {sort: [['datefield', 1]]}).toArray(function(err, docs) {...});

'asc' or 'ascending' can also be used in place of the 1.

To sort descending, use 'desc', 'descending', or -1 in place of the 1.

How do I print a datetime in the local timezone?

This script demonstrates a few ways to show the local timezone using astimezone():

#!/usr/bin/env python3

import pytz
from datetime import datetime, timezone
from tzlocal import get_localzone

utc_dt = datetime.now(timezone.utc)

PST = pytz.timezone('US/Pacific')
EST = pytz.timezone('US/Eastern')
JST = pytz.timezone('Asia/Tokyo')
NZST = pytz.timezone('Pacific/Auckland')

print("Pacific time {}".format(utc_dt.astimezone(PST).isoformat()))
print("Eastern time {}".format(utc_dt.astimezone(EST).isoformat()))
print("UTC time     {}".format(utc_dt.isoformat()))
print("Japan time   {}".format(utc_dt.astimezone(JST).isoformat()))

# Use astimezone() without an argument
print("Local time   {}".format(utc_dt.astimezone().isoformat()))

# Use tzlocal get_localzone
print("Local time   {}".format(utc_dt.astimezone(get_localzone()).isoformat()))

# Explicitly create a pytz timezone object
# Substitute a pytz.timezone object for your timezone
print("Local time   {}".format(utc_dt.astimezone(NZST).isoformat()))

It outputs the following:

$ ./timezones.py 
Pacific time 2019-02-22T17:54:14.957299-08:00
Eastern time 2019-02-22T20:54:14.957299-05:00
UTC time     2019-02-23T01:54:14.957299+00:00
Japan time   2019-02-23T10:54:14.957299+09:00
Local time   2019-02-23T14:54:14.957299+13:00
Local time   2019-02-23T14:54:14.957299+13:00
Local time   2019-02-23T14:54:14.957299+13:00

As of python 3.6 calling astimezone() without a timezone object defaults to the local zone (docs). This means you don't need to import tzlocal and can simply do the following:

#!/usr/bin/env python3

from datetime import datetime, timezone

utc_dt = datetime.now(timezone.utc)

print("Local time {}".format(utc_dt.astimezone().isoformat()))

How can I start an Activity from a non-Activity class?

I don't know if this is good practice or not, but casting a Context object to an Activity object compiles fine.

Try this: ((Activity) mContext).startActivity(...)

codeigniter model error: Undefined property

You have to load the db library first. In autoload.php add :

$autoload['libraries'] = array('database');

Also, try renaming User model class for "User_model".

How to find tag with particular text with Beautiful Soup?

Since Beautiful Soup 4.4.0. a parameter called string does the work that text used to do in the previous versions.

string is for finding strings, you can combine it with arguments that find tags: Beautiful Soup will find all tags whose .string matches your value for the string. This code finds the tags whose .string is “Elsie”:

soup.find_all("td", string="Elsie")

For more information about string have a look this section https://www.crummy.com/software/BeautifulSoup/bs4/doc/#the-string-argument

How do I import a specific version of a package using go get?

A little cheat sheet on module queries.

To check all existing versions: e.g. go list -m -versions github.com/gorilla/mux

Specific version @v1.2.8
Specific commit @c783230
Specific branch @master
Version prefix @v2
Comparison @>=2.1.5
Latest @latest

E.g. go get github.com/gorilla/[email protected]

How do I get the IP address into a batch-file variable?

Using IPCONFIG is good, unless you want the flexibility of getting the IP of a remote host in addition to the local host. To get it from something like www.google.com using PING try:

for /f "tokens=2 delims=[]" %%f in ('ping -4 -n 1 www.google.com ^|find /i "pinging"') do echo IP=%%f

The result for that example is:

IP=173.194.73.106

To get the first IP of your local host, replace "www.google.com" with "%computername%" without the quotes. Note the "-4" in front will always get the IPv4 address instead of a possible IPv6 address. Omit as needed. Note also that this technique cannot get more than one IP address. If that is your goal, you'll need to use NSLOOKUP with some extra code.

Mind you, if you use NSLOOKUP instead of PING, and the host has more than one IP address, then your variable will have a comma at the end, since each address will be separated by a comma.

Standardize data columns in R

I have to assume you meant to say that you wanted a mean of 0 and a standard deviation of 1. If your data is in a dataframe and all the columns are numeric you can simply call the scale function on the data to do what you want.

dat <- data.frame(x = rnorm(10, 30, .2), y = runif(10, 3, 5))
scaled.dat <- scale(dat)

# check that we get mean of 0 and sd of 1
colMeans(scaled.dat)  # faster version of apply(scaled.dat, 2, mean)
apply(scaled.dat, 2, sd)

Using built in functions is classy. Like this cat:

enter image description here

Specified cast is not valid.. how to resolve this

Use Convert.ToDouble(value) rather than (double)value. It takes an object and supports all of the types you asked for! :)

Also, your method is always returning a string in the code above; I'd recommend having the method indicate so, and give it a more obvious name (public string FormatLargeNumber(object value))

javax.xml.bind.JAXBException: Class *** nor any of its super class is known to this context

I had a similar issue using the JAXB reference implementation and JBoss AS 7.1. I was able to write an integration test that confirmed JAXB worked outside of the JBoss environment (suggesting the problem might be the class loader in JBoss).

This is the code that was giving the error (i.e. not working):

private static final JAXBContext JC;

static {
    try {
        JC = JAXBContext.newInstance("org.foo.bar");
    } catch (Exception exp) {
        throw new RuntimeException(exp);
    }
}

and this is the code that worked (ValueSet is one of the classes marshaled from my XML).

private static final JAXBContext JC;

static {
    try {
        ClassLoader classLoader = ValueSet.class.getClassLoader();
        JC = JAXBContext.newInstance("org.foo.bar", classLoader);
    } catch (Exception exp) {
        throw new RuntimeException(exp);
    }
}

In some cases I got the Class nor any of its super class is known to this context. In other cases I also got an exception of org.foo.bar.ValueSet cannot be cast to org.foo.bar.ValueSet (similar to the issue described here: ClassCastException when casting to the same class).

Java Singleton and Synchronization

public class Elvis { 
   public static final Elvis INSTANCE = new Elvis();
   private Elvis () {...}
 }

Source : Effective Java -> Item 2

It suggests to use it, if you are sure that class will always remain singleton.

LEFT function in Oracle

There is no documented LEFT() function in Oracle. Find the full set here.

Probably what you have is a user-defined function. You can check that easily enough by querying the data dictionary:

select * from all_objects
where object_name = 'LEFT'

But there is the question of why the stored procedure works and the query doesn't. One possible solution is that the stored procedure is owned by another schema, which also owns the LEFT() function. They have granted rights on the procedure but not its dependencies. This works because stored procedures run with DEFINER privileges by default, so you run the stored procedure as if you were its owner.

If this is so then the data dictionary query I listed above won't help you: it will only return rows for objects you have rights on. In which case you will need to run the query as the stored procedure's owner or connect as a user with the rights to query DBA_OBJECTS instead.

grep regex whitespace behavior

This looks like a behavior difference in the handling of \s between grep 2.5 and newer versions (a bug in old grep?). I confirm your result with grep 2.5.4, but all four of your greps do work when using grep 2.6.3 (Ubuntu 10.10).

Note:

GNU grep 2.5.4
echo "foo bar" | grep "\s"
   (doesn't match)

whereas

GNU grep 2.6.3
echo "foo bar" | grep "\s"
foo bar

Probably less trouble (as \s is not documented):

Both GNU greps
echo "foo bar" | grep "[[:space:]]"
foo bar

My advice is to avoid using \s ... use [ \t]* or [[:space:]] or something like it instead.

How to add option to select list in jQuery

This is working fine, try out this.

var ob = $("#myListBox");

for (var i = 0; i < buildings.length; i++) {
     var val = buildings[i];
     var text = buildings[i];

     ob.prepend("<option value="+ val +">" + text + "</option>");
}

How to give Jenkins more heap space when it´s started as a service under Windows?

I've added to /etc/sysconfig/jenkins (CentOS):

# Options to pass to java when running Jenkins.
#
JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Xmx1024m -XX:MaxPermSize=512m"

For ubuntu the same config should be located in /etc/default

Getting Error 800a0e7a "Provider cannot be found. It may not be properly installed."

I got the same issue and It got solved by installing Oracle 11g client in my machine..

I have not installed any excclusive drivers for it. I am using windows7 with 64 bit. Interestignly, when I navigate into the path Start > Settings > Control Panel > Administrative Tools > DataSources(ODBC) > Drivers. I found only SQL server in it

Please Finc the attachment below for the same

Python "SyntaxError: Non-ASCII character '\xe2' in file"

I had the same error while copying and pasting a comment from the web

For me it was a single quote (') in the word

I just erased it and re-typed it.

Changing MongoDB data store directory

If installed via apt-get in Ubuntu 12.04, don't forget to chown -R mongodb:nogroup /path/to/new/directory. Also, change the configuration at /etc/mongodb.conf.

As a reminder, the mongodb-10gen package is now started via upstart, so the config script is in /etc/init/mongodb.conf

I just went through this, hope googlers find it useful :)

How to Customize the time format for Python logging?

To add to the other answers, here are the variable list from Python Documentation.

Directive   Meaning Notes

%a  Locale’s abbreviated weekday name.   
%A  Locale’s full weekday name.  
%b  Locale’s abbreviated month name.     
%B  Locale’s full month name.    
%c  Locale’s appropriate date and time representation.   
%d  Day of the month as a decimal number [01,31].    
%H  Hour (24-hour clock) as a decimal number [00,23].    
%I  Hour (12-hour clock) as a decimal number [01,12].    
%j  Day of the year as a decimal number [001,366].   
%m  Month as a decimal number [01,12].   
%M  Minute as a decimal number [00,59].  
%p  Locale’s equivalent of either AM or PM. (1)
%S  Second as a decimal number [00,61]. (2)
%U  Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0.    (3)
%w  Weekday as a decimal number [0(Sunday),6].   
%W  Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0.    (3)
%x  Locale’s appropriate date representation.    
%X  Locale’s appropriate time representation.    
%y  Year without century as a decimal number [00,99].    
%Y  Year with century as a decimal number.   
%z  Time zone offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM, where H represents decimal hour digits and M represents decimal minute digits [-23:59, +23:59].  
%Z  Time zone name (no characters if no time zone exists).   
%%  A literal '%' character.

How to get hex color value rather than RGB value?

Convert RGB to Hex

I am using Jasmine protractor and I was getting errors like - Expected [ 'rgba(255, 255, 255, 1)' ] to contain '#fff'. Below function worked fine for me.

function RGBAToHexA(test:string) {
let sep = test.toString().indexOf(",") > -1 ? "," : " ";
const rgba = test.toString().substring(5).split(")")[0].split(sep);
console.log(rgba)
let r = (+rgba[0]).toString(16),
  g = (+rgba[1]).toString(16),
  b = (+rgba[2]).toString(16),
  a = Math.round(+rgba[3] * 255).toString(16);

    if (r.length == 1)
        r = "0" + r;
    if (g.length == 1)
        g = "0" + g;
    if (b.length == 1)
        b = "0" + b;
    if (a.length == 1)
        a = "0" + a;

return "#" + r + g + b + a;

}

describe('Check CSS', function() {
 
it('should check css of login page', async function(){
        browser.waitForAngularEnabled(true);
        browser.actions().mouseMove(element(by.css('.btn-auth, .btn-auth:hover'))).perform(); // mouse hover on button
        csspage.Loc_auth_btn.getCssValue('color').then(function(color){
            console.log(RGBAToHexA(color))
            expect( RGBAToHexA(color)).toContain(cssData.hoverauth.color);

        })

Web scraping with Java

There is also Jaunt Java Web Scraping & JSON Querying - http://jaunt-api.com

Excel - Shading entire row based on change of value

A simpler version of one of the above answers. Column A is the key.
Yes, it needs a helper column.  That's column K.
1) Set first cell in table to TRUE (K8)
2) On second row at K9, and to end of table (K99), paste: =IF(A8=A9,K8,NOT(K8))
This gives a pattern of TRUE...TRUE, FALSE...FALSE,...
3) Select key column A1:A99, or whole table A1:K99
4) Set Home/Conditional/New Rule/Formula  =K8
5) Format as you wish for the TRUE cells
6) Select the range from (3) and Right-click Format White (or whatever
background color you want) for the FALSE cells

Note that this solution (and the others) have a major flaw, in that this
highlighting doesn't work properly when you have filters active in your
table.  I want that fix :)

How to pass a value from Vue data to href?

If you want to display links coming from your state or store in Vue 2.0, you can do like this:

<a v-bind:href="''"> {{ url_link }} </a>

How do I send a cross-domain POST request via JavaScript?

Update: Before continuing everyone should read and understand the html5rocks tutorial on CORS. It is easy to understand and very clear.

If you control the server being POSTed, simply leverage the "Cross-Origin Resource Sharing standard" by setting response headers on the server. This answer is discussed in other answers in this thread, but not very clearly in my opinion.

In short here is how you accomplish the cross domain POST from from.com/1.html to to.com/postHere.php (using PHP as an example). Note: you only need to set Access-Control-Allow-Origin for NON OPTIONS requests - this example always sets all headers for a smaller code snippet.

In postHere.php setup the following:

switch ($_SERVER['HTTP_ORIGIN']) {
    case 'http://from.com': case 'https://from.com':
    header('Access-Control-Allow-Origin: '.$_SERVER['HTTP_ORIGIN']);
    header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');
    header('Access-Control-Max-Age: 1000');
    header('Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With');
    break;
}

This allows your script to make cross domain POST, GET and OPTIONS. This will become clear as you continue to read...

Setup your cross domain POST from JS (jQuery example):

$.ajax({
    type: 'POST',
    url: 'https://to.com/postHere.php',
    crossDomain: true,
    data: '{"some":"json"}',
    dataType: 'json',
    success: function(responseData, textStatus, jqXHR) {
        var value = responseData.someKey;
    },
    error: function (responseData, textStatus, errorThrown) {
        alert('POST failed.');
    }
});

When you do the POST in step 2, your browser will send a "OPTIONS" method to the server. This is a "sniff" by the browser to see if the server is cool with you POSTing to it. The server responds with an "Access-Control-Allow-Origin" telling the browser its OK to POST|GET|ORIGIN if request originated from "http://from.com" or "https://from.com". Since the server is OK with it, the browser will make a 2nd request (this time a POST). It is good practice to have your client set the content type it is sending - so you'll need to allow that as well.

MDN has a great write-up about HTTP access control, that goes into detail of how the entire flow works. According to their docs, it should "work in browsers that support cross-site XMLHttpRequest". This is a bit misleading however, as I THINK only modern browsers allow cross domain POST. I have only verified this works with safari,chrome,FF 3.6.

Keep in mind the following if you do this:

Your server will have to handle 2 requests per operation
You will have to think about the security implications. Be careful before doing something like 'Access-Control-Allow-Origin: *'
This wont work on mobile browsers. In my experience they do not allow cross domain POST at all. I've tested android, iPad, iPhone
There is a pretty big bug in FF < 3.6 where if the server returns a non 400 response code AND there is a response body (validation errors for example), FF 3.6 wont get the response body. This is a huge pain in the ass, since you cant use good REST practices. See bug here (its filed under jQuery, but my guess is its a FF bug - seems to be fixed in FF4).
Always return the headers above, not just on OPTION requests. FF needs it in the response from the POST.

Fastest way to reset every value of std::vector<int> to 0

How about the assign member function?

some_vector.assign(some_vector.size(), 0);

How to deselect a selected UITableView cell?

If you want to select any table cell with the first click and deselect with the second, you should use this code:

- (void)tableView:(UITableView *)tableView 
        didSelectRowAtIndexPath:(NSIndexPath *)indexPath {   

    if (self.selectedIndexPath && 
        [indexPath compare:self.selectedIndexPath] == NSOrderedSame) {

        [tableView deselectRowAtIndexPath:indexPath animated:YES];
         self.selectedIndexPath = nil;
    } 
    else {
        self.selectedIndexPath = indexPath;
    }
}

Calendar date to yyyy-MM-dd format in java

public static void main(String[] args) {
    Calendar cal = Calendar.getInstance();
    cal.set(year, month, date);
    SimpleDateFormat format1 = new SimpleDateFormat("yyyy MM dd");
    String formatted = format1.format(cal.getTime());
    System.out.println(formatted);
}

How to print something when running Puppet client?

Easier way, use notice. e.g notice("foo.pp works") or notice($foo)

What is the best way to determine a session variable is null or empty in C#?

Checking for nothing/Null is the way to do it.

Dealing with object types is not the way to go. Declare a strict type and try to cast the object to the correct type. (And use cast hint or Convert)

 private const string SESSION_VAR = "myString";
 string sSession;
 if (Session[SESSION_VAR] != null)
 {
     sSession = (string)Session[SESSION_VAR];
 }
 else
 {
     sSession = "set this";
     Session[SESSION_VAR] = sSession;
 }

Sorry for any syntax violations, I am a daily VB'er

How to "pull" from a local branch into another one?

you have to tell git where to pull from, in this case from the current directory/repository:

git pull . master

but when working locally, you usually just call merge (pull internally calls merge):

git merge master

Run-time error '1004' - Method 'Range' of object'_Global' failed

Change

Range(DataImportColumn & DataImportRow).Offset(0, 2).Value

Cells(DataImportRow,DataImportColumn).Value

When you just have the row and the column then you can use the cells() object. The syntax is Cells(Row,Column)

Also one more tip. You might want to fully qualify your Cells object. for example

ThisWorkbook.Sheets("WhatEver").Cells(DataImportRow,DataImportColumn).Value

subsetting a Python DataFrame

Creating an Empty Dataframe with known Column Name:

Names = ['Col1','ActivityID','TransactionID']
df = pd.DataFrame(columns = Names)

Creating a dataframe from csv:

df = pd.DataFrame('...../file_name.csv')

Creating a dynamic filter to subset a dtaframe:

i = 12
df[df['ActivitiID'] <= i]

Creating a dynamic filter to subset required columns of dtaframe

df[df['ActivityID'] == i][['TransactionID','ActivityID']]

Is there an equivalent of lsusb for OS X

In mac osx , you can use the following command:

system_profiler SPUSBDataType

How to get the first five character of a String

I don't know why anybody mentioned this. But it's the shortest and simplest way to achieve this.

string str = yourString.Remove(n);

n - number of characters that you need

Example

var zz = "7814148471";
Console.WriteLine(zz.Remove(5));
//result - 78141

How to convert Java String to JSON Object

Converting the String to JsonNode using ObjectMapper object :

ObjectMapper mapper = new ObjectMapper();

// For text string
JsonNode = mapper.readValue(mapper.writeValueAsString("Text-string"), JsonNode.class)

// For Array String
JsonNode = mapper.readValue("[\"Text-Array\"]"), JsonNode.class)

// For Json String 
String json = "{\"id\" : \"1\"}";
ObjectMapper mapper = new ObjectMapper();
JsonFactory factory = mapper.getFactory();
JsonParser jsonParser = factory.createParser(json);
JsonNode node = mapper.readTree(jsonParser);

angular-cli server - how to proxy API requests to another server?

I'll explain what you need to know on the example below:

{
  "/folder/sub-folder/*": {
    "target": "http://localhost:1100",
    "secure": false,
    "pathRewrite": {
      "^/folder/sub-folder/": "/new-folder/"
    },
    "changeOrigin": true,
    "logLevel": "debug"
  }
}

/folder/sub-folder/*: path says: When I see this path inside my angular app (the path can be stored anywhere) I want to do something with it. The * character indicates that everything that follows the sub-folder will be included. For instance, if you have multiple fonts inside /folder/sub-folder/, the * will pick up all of them
"target": "http://localhost:1100" for the path above make target URL the host/source, therefore in the background we will have http://localhost:1100/folder/sub-folder/
"pathRewrite": { "^/folder/sub-folder/": "/new-folder/" }, Now let's say that you want to test your app locally, the url http://localhost:1100/folder/sub-folder/ may contain an invalid path: /folder/sub-folder/. You want to change that path to a correct one which is http://localhost:1100/new-folder/, therefore the pathRewrite will become useful. It will exclude the path in the app(left side) and include the newly written one (right side)
"secure": represents wether we are using http or https. If https is used in the target attribute then set secure attribute to true otherwise set it to false
"changeOrigin": option is only necessary if your host target is not the current environment, for example: localhost. If you want to change the host to www.something.com which would be the target in the proxy then set the changeOrigin attribute to "true":
"logLevel": attribute specifies wether the developer wants to display proxying on his terminal/cmd, hence he would use the "debug" value as shown in the image

In general, the proxy helps in developing the application locally. You set your file paths for production purpose and if you have all these files locally inside your project you may just use proxy to access them without changing the path dynamically in your app.

If it works, you should see something like this in your cmd/terminal.

Checking password match while typing

$('#txtConfirmPassword').keyup(function(){


if($(this).val() != $('#txtNewPassword').val().substr(0,$(this).val().length))
{
 alert('confirm password not match');
}



});

Copying sets Java

Another way to do this is to use the copy constructor:

Collection<E> oldSet = ...
TreeSet<E> newSet = new TreeSet<E>(oldSet);

Or create an empty set and add the elements:

Collection<E> oldSet = ...
TreeSet<E> newSet = new TreeSet<E>();
newSet.addAll(oldSet);

Unlike clone these allow you to use a different set class, a different comparator, or even populate from some other (non-set) collection type.

^{Note that the result of copying a Set is a new Set containing references to the objects that are elements if the original Set. The element objects themselves are not copied or cloned. This conforms with the way that the Java Collection APIs are designed to work: they don't copy the element objects.}

What is ModelState.IsValid valid for in ASP.NET MVC in NerdDinner?

Yes , Jared and Kelly Orr are right. I use the following code like in edit exception.

foreach (var issue in dinner.GetRuleViolations())
{
    ModelState.AddModelError(issue.PropertyName, issue.ErrorMessage);
}

in stead of

ModelState.AddRuleViolations(dinner.GetRuleViolations());

How to clear the interpreter console?

Here's a cross platform (Windows / Linux / Mac / Probably others that you can add in the if check) version snippet I made combining information found in this question:

import os
clear = lambda: os.system('cls' if os.name=='nt' else 'clear')
clear()

Same idea but with a spoon of syntactic sugar:

import subprocess   
clear = lambda: subprocess.call('cls||clear', shell=True)
clear()

Netbeans installation doesn't find JDK

Set JAVA_HOME in environment variable.

set JAVA_HOME to only JDK1.6.0_23 or whatever jdk folder you have. dont include bin folder in path.

How do I use the includes method in lodash to check if an object is in the collection?

You could use find to solve your problem

https://lodash.com/docs/#find

const data = [{"a": 1}, {"b": 2}]
const item = {"b": 2}


find(data, item)
// > true

Set specific precision of a BigDecimal

The title of the question asks about precision. BigDecimal distinguishes between scale and precision. Scale is the number of decimal places. You can think of precision as the number of significant figures, also known as significant digits.

Some examples in Clojure.

(.scale     0.00123M) ; 5
(.precision 0.00123M) ; 3

(In Clojure, The M designates a BigDecimal literal. You can translate the Clojure to Java if you like, but I find it to be more compact than Java!)

You can easily increase the scale:

(.setScale 0.00123M 7) ; 0.0012300M

But you can't decrease the scale in the exact same way:

(.setScale 0.00123M 3) ; ArithmeticException Rounding necessary

You'll need to pass a rounding mode too:

(.setScale 0.00123M 3 BigDecimal/ROUND_HALF_EVEN) ;
; Note: BigDecimal would prefer that you use the MathContext rounding
; constants, but I don't have them at my fingertips right now.

So, it is easy to change the scale. But what about precision? This is not as easy as you might hope!

It is easy to decrease the precision:

(.round 3.14159M (java.math.MathContext. 3)) ; 3.14M

But it is not obvious how to increase the precision:

(.round 3.14159M (java.math.MathContext. 7)) ; 3.14159M (unexpected)

For the skeptical, this is not just a matter of trailing zeros not being displayed:

(.precision (.round 3.14159M (java.math.MathContext. 7))) ; 6 
; (same as above, still unexpected)

FWIW, Clojure is careful with trailing zeros and will show them:

4.0000M ; 4.0000M
(.precision 4.0000M) ; 5

Back on track... You can try using a BigDecimal constructor, but it does not set the precision any higher than the number of digits you specify:

(BigDecimal. "3" (java.math.MathContext. 5)) ; 3M
(BigDecimal. "3.1" (java.math.MathContext. 5)) ; 3.1M

So, there is no quick way to change the precision. I've spent time fighting this while writing up this question and with a project I'm working on. I consider this, at best, A CRAZYTOWN API, and at worst a bug. People. Seriously?

So, best I can tell, if you want to change precision, you'll need to do these steps:

Lookup the current precision.
Lookup the current scale.
Calculate the scale change.
Set the new scale

These steps, as Clojure code:

(def x 0.000691M) ; the input number
(def p' 1) ; desired precision
(def s' (+ (.scale x) p' (- (.precision x)))) ; desired new scale
(.setScale x s' BigDecimal/ROUND_HALF_EVEN)
; 0.0007M

I know, this is a lot of steps just to change the precision!

Why doesn't BigDecimal already provide this? Did I overlook something?

Usage of $broadcast(), $emit() And $on() in AngularJS

$emit

It dispatches an event name upwards through the scope hierarchy and notify to the registered $rootScope.Scope listeners. The event life cycle starts at the scope on which $emit was called. The event traverses upwards toward the root scope and calls all registered listeners along the way. The event will stop propagating if one of the listeners cancels it.

$broadcast

It dispatches an event name downwards to all child scopes (and their children) and notify to the registered $rootScope.Scope listeners. The event life cycle starts at the scope on which $broadcast was called. All listeners for the event on this scope get notified. Afterwards, the event traverses downwards toward the child scopes and calls all registered listeners along the way. The event cannot be canceled.

$on

It listen on events of a given type. It can catch the event dispatched by $broadcast and $emit.

Visual demo:

Demo working code, visually showing scope tree (parent/child relationship):
http://plnkr.co/edit/am6IDw?p=preview

Demonstrates the method calls:

  $scope.$on('eventEmitedName', function(event, data) ...
  $scope.broadcastEvent
  $scope.emitEvent

dropping rows from dataframe based on a "not in" condition

You can use Series.isin:

df = df[~df.datecolumn.isin(a)]

While the error message suggests that all() or any() can be used, they are useful only when you want to reduce the result into a single Boolean value. That is however not what you are trying to do now, which is to test the membership of every values in the Series against the external list, and keep the results intact (i.e., a Boolean Series which will then be used to slice the original DataFrame).

You can read more about this in the Gotchas.

How do I get the SharedPreferences from a PreferenceActivity in Android?

If you don't have access to getDefaultSharedPreferenes(), you can use getSharedPreferences(name, mode) instead, you just have to pass in the right name.

Android creates this name (possibly based on the package name of your project?). You can get it by putting the following code in a SettingsActivity onCreate(), and seeing what preferencesName is.

String preferencesName = this.getPreferenceManager().getSharedPreferencesName();

The string should be something like com.example.projectname_preferences. Hard code that somewhere in your project, and pass it in to getSharedPreferences() and you should be good to go.

Best way to clear a PHP array's values

i have used unset() to clear the array but i have come to realize that unset() will render the array null hence the need to re-declare the array like for example

<?php 
    $arr = array();
    array_push($arr , "foo");
    unset($arr); // this will set the array to null hence you need the line below or redeclaring it.
    $arr  = array();

    // do what ever you want here
?>

Can't find System.Windows.Media namespace?

You should add reference to PresentationCore.dll.

Java: Local variable mi defined in an enclosing scope must be final or effectively final

Yes this is happening because you are accessing mi variable from within your anonymous inner class, what happens deep inside is that another copy of your variable is created and will be use inside the anonymous inner class, so for data consistency the compiler will try restrict you from changing the value of mi so that's why its telling you to set it to final.

How can I login to a website with Python?

Let me try to make it simple, suppose URL of the site is www.example.com and you need to sign up by filling username and password, so we go to the login page say http://www.example.com/login.php now and view it's source code and search for the action URL it will be in form tag something like

 <form name="loginform" method="post" action="userinfo.php">

now take userinfo.php to make absolute URL which will be 'http://example.com/userinfo.php', now run a simple python script

import requests
url = 'http://example.com/userinfo.php'
values = {'username': 'user',
          'password': 'pass'}

r = requests.post(url, data=values)
print r.content

I Hope that this helps someone somewhere someday.

Repeat rows of a data.frame

My solution similar as mefa:::rep.data.frame, but a little faster and cares about row names:

rep.data.frame <- function(x, times) {
    rnames <- attr(x, "row.names")
    x <- lapply(x, rep.int, times = times)
    class(x) <- "data.frame"
    if (!is.numeric(rnames))
        attr(x, "row.names") <- make.unique(rep.int(rnames, times))
    else
        attr(x, "row.names") <- .set_row_names(length(rnames) * times)
    x
}

Compare solutions:

library(Lahman)
library(microbenchmark)
microbenchmark(
    mefa:::rep.data.frame(Batting, 10),
    rep.data.frame(Batting, 10),
    Batting[rep.int(seq_len(nrow(Batting)), 10), ],
    times = 10
)
#> Unit: milliseconds
#>                                            expr       min       lq     mean   median        uq       max neval cld
#>              mefa:::rep.data.frame(Batting, 10) 127.77786 135.3480 198.0240 148.1749  278.1066  356.3210    10  a 
#>                     rep.data.frame(Batting, 10)  79.70335  82.8165 134.0974  87.2587  191.1713  307.4567    10  a 
#>  Batting[rep.int(seq_len(nrow(Batting)), 10), ] 895.73750 922.7059 981.8891 956.3463 1018.2411 1127.3927    10   b

Using Linq to group a list of objects into a new grouped list of list of objects

Still an old one, but answer from Lee did not give me the group.Key as result. Therefore, I am using the following statement to group a list and return a grouped list:

public IOrderedEnumerable<IGrouping<string, User>> groupedCustomerList;

groupedCustomerList =
        from User in userList
        group User by User.GroupID into newGroup
        orderby newGroup.Key
        select newGroup;

Each group now has a key, but also contains an IGrouping which is a collection that allows you to iterate over the members of the group.

How do I clear the content of a div using JavaScript?

You can do it the DOM way as well:

var div = document.getElementById('cart_item');
while(div.firstChild){
    div.removeChild(div.firstChild);
}

Separating class code into a header and cpp file

I won't refer too your example as it is quite simple for a general answer (for example it doesn't contain templated functions ,which force you to implement them on the header) , what I follow as a rule of thumb is the pimpl idiom

It has quite some benefits as you get faster compilation times and the syntactic sugar :

class->member instead of class.member

The only drawback is the extra pointer you pay.

JSON parsing using Gson for Java

In my first gson application I avoided using additional classes to catch values mainly because I use json for config matters

despite the lack of information (even gson page), that's what I found and used:

starting from

Map jsonJavaRootObject = new Gson().fromJson("{/*whatever your mega complex object*/}", Map.class)

Each time gson sees a {}, it creates a Map (actually a gson StringMap )

Each time gson sees a '', it creates a String

Each time gson sees a number, it creates a Double

Each time gson sees a [], it creates an ArrayList

You can use this facts (combined) to your advantage

Finally this is the code that makes the thing

        Map<String, Object> javaRootMapObject = new Gson().fromJson(jsonLine, Map.class);

    System.out.println(
        (
            (Map)
            (
                (List)
                (
                    (Map)
                    (
                        javaRootMapObject.get("data")
                    )
                 ).get("translations")
            ).get(0)
        ).get("translatedText")
    );

Not unique table/alias

 select persons.personsid,name,info.id,address
    -> from persons
    -> inner join persons on info.infoid = info.info.id;

Rails 3 migrations: Adding reference column?

When adding a column you need to make that column an integer and if possible stick with rails conventions. So for your case I am assuming you already have a Tester and User models, and testers and users tables.

To add the foreign key you need to create an integer column with the name user_id (convention):

add_column :tester, :user_id, :integer

Then add a belongs_to to the tester model:

class Tester < ActiveRecord::Base
  belongs_to :user
end

And you might also want to add an index for the foreign key (this is something the references already does for you):

add_index :tester, :user_id

How to do a SQL NOT NULL with a DateTime?

erm it does work? I've just tested it?

/****** Object:  Table [dbo].[DateTest]    Script Date: 09/26/2008 10:44:21 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[DateTest](
    [Date1] [datetime] NULL,
    [Date2] [datetime] NOT NULL
) ON [PRIMARY]

GO
Insert into DateTest (Date1,Date2) VALUES (NULL,'1-Jan-2008')
Insert into DateTest (Date1,Date2) VALUES ('1-Jan-2008','1-Jan-2008')
Go
SELECT * FROM DateTest WHERE Date1 is not NULL
GO
SELECT * FROM DateTest WHERE Date2 is not NULL

How do I search an SQL Server database for a string?

If you need to find database objects (e.g. tables, columns, and triggers) by name - have a look at the free Redgate Software tool called SQL Search which does this - it searches your entire database for any kind of string(s).

Enter image description here

It's a great must-have tool for any DBA or database developer - did I already mention it's absolutely free to use for any kind of use??

Rename Files and Directories (Add Prefix)

with Perl:

perl -e 'rename $_, "PRE_$_" for <*>'

Run Command Prompt Commands

This can also be done by P/Invoking the C standard library's system function.

using System.Runtime.InteropServices;

[DllImport("msvcrt.dll")]
public static extern int system(string format);

system("copy Test.txt Test2.txt");

Output:

      1 file(s) copied.

How to assign string to bytes array

Piece of cake:

arr := []byte("That's all folks!!")

How can I pad an integer with zeros on the left?

Let's say you want to print 11 as 011

You could use a formatter: "%03d".

You can use this formatter like this:

int a = 11;
String with3digits = String.format("%03d", a);
System.out.println(with3digits);

Alternatively, some java methods directly support these formatters:

System.out.printf("%03d", a);

What is the purpose of Node.js module.exports and how do you use it?

The intent is:

Modular programming is a software design technique that emphasizes separating the functionality of a program into independent, interchangeable modules, such that each contains everything necessary to execute only one aspect of the desired functionality.

Wikipedia

I imagine it becomes difficult to write a large programs without modular / reusable code. In nodejs we can create modular programs utilising module.exports defining what we expose and compose our program with require.

Try this example:

fileLog.js

function log(string) { require('fs').appendFileSync('log.txt',string); }

module.exports = log;

stdoutLog.js

function log(string) { console.log(string); }

module.exports = log;

program.js

const log = require('./stdoutLog.js')

log('hello world!');

execute

$ node program.js

hello world!

Now try swapping ./stdoutLog.js for ./fileLog.js.

URL to compose a message in Gmail (with full Gmail interface and specified to, bcc, subject, etc.)

https://mail.google.com/mail/u/0/x/?&v=b&eot=1&pv=tl&cs=b

This link works for composing directly in m.gmail.com as mobile in a desktop browser. Why? It is really faster.

Passing a Bundle on startActivity()?

You have a few options:

1) Use the Bundle from the Intent:

Intent mIntent = new Intent(this, Example.class);
Bundle extras = mIntent.getExtras();
extras.putString(key, value);

2) Create a new Bundle

Intent mIntent = new Intent(this, Example.class);
Bundle mBundle = new Bundle();
mBundle.putString(key, value);
mIntent.putExtras(mBundle);

3) Use the putExtra() shortcut method of the Intent

Intent mIntent = new Intent(this, Example.class);
mIntent.putExtra(key, value);

Then, in the launched Activity, you would read them via:

String value = getIntent().getExtras().getString(key)

NOTE: Bundles have "get" and "put" methods for all the primitive types, Parcelables, and Serializables. I just used Strings for demonstrational purposes.

How can you check for a #hash in a URL using JavaScript?

Throwing this in here as a method for abstracting location properties from arbitrary URI-like strings. Although window.location instanceof Location is true, any attempt to invoke Location will tell you that it's an illegal constructor. You can still get to things like hash, query, protocol etc by setting your string as the href property of a DOM anchor element, which will then share all the address properties with window.location.

Simplest way of doing this is:

var a = document.createElement('a');
a.href = string;

string.hash;

For convenience, I wrote a little library that utilises this to replace the native Location constructor with one that will take strings and produce window.location-like objects: Location.js

WPF User Control Parent

Gold plated edition of the above (I need a generic function which can infer a Window within the context of a MarkupExtension:-

public sealed class MyExtension : MarkupExtension
{
    public override object ProvideValue(IServiceProvider serviceProvider) =>
        new MyWrapper(ResolveRootObject(serviceProvider));
    object ResolveRootObject(IServiceProvider serviceProvider) => 
         GetService<IRootObjectProvider>(serviceProvider).RootObject;
}

class MyWrapper
{
    object _rootObject;

    Window OwnerWindow() => WindowFromRootObject(_rootObject);

    static Window WindowFromRootObject(object root) =>
        (root as Window) ?? VisualParent<Window>((DependencyObject)root);
    static T VisualParent<T>(DependencyObject node) where T : class
    {
        if (node == null)
            throw new InvalidOperationException("Could not locate a parent " + typeof(T).Name);
        var target = node as T;
        if (target != null)
            return target;
        return VisualParent<T>(VisualTreeHelper.GetParent(node));
    }
}

MyWrapper.Owner() will correctly infer a Window on the following basis:

the root Window by walking the visual tree (if used in the context of a UserControl)
the window within which it is used (if it is used in the context of a Window's markup)

Refresh Page and Keep Scroll Position

Thanks Sanoj, that worked for me.
However iOS does not support "onbeforeunload" on iPhone. Workaround for me was to set localStorage with js:

<button onclick="myFunction()">Click me</button>

<script>
document.addEventListener("DOMContentLoaded", function(event) { 
            var scrollpos = localStorage.getItem('scrollpos');
            if (scrollpos) window.scrollTo(0, scrollpos);
        });
function myFunction() {
  localStorage.setItem('scrollpos', window.scrollY);
  location.reload(); 
}
</script>

What's the best way to determine the location of the current PowerShell script?

function func1() 
{
   $inv = (Get-Variable MyInvocation -Scope 1).Value
   #$inv.MyCommand | Format-List *   
   $Path1 = Split-Path $inv.scriptname
   Write-Host $Path1
}

function Main()
{
    func1
}

Main

Unfortunately MyApp has stopped. How can I solve this?

Let me share a basic Logcat analysis for when you meet a Force Close (when the app stops working).

DOCS

The basic tool from Android to collect/analyze logs is the logcat.

HERE is the Android's page about logcat

If you use android Studio, you can also check this LINK.

Capturing

Basically, you can MANUALLY capture logcat with the following command (or just check AndroidMonitor window in AndroidStudio):

adb logcat

There's a lot of parameters you can add to the command which helps you to filter and display the message that you want... This is personal... I always use the command below to get the message timestamp:

adb logcat -v time

You can redirect the output to a file and analyze it in a Text Editor.

Analyzing

If you app is Crashing, you'll get something like:

07-09 08:29:13.474 21144-21144/com.example.khan.abc D/AndroidRuntime: Shutting down VM
07-09 08:29:13.475 21144-21144/com.example.khan.abc E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.khan.abc, PID: 21144
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentActivity.onBackPressed()' on a null object reference
     at com.example.khan.abc.AudioFragment$1.onClick(AudioFragment.java:125)
     at android.view.View.performClick(View.java:4848)
     at android.view.View$PerformClick.run(View.java:20262)
     at android.os.Handler.handleCallback(Handler.java:815)
     at android.os.Handler.dispatchMessage(Handler.java:104)
     at android.os.Looper.loop(Looper.java:194)
     at android.app.ActivityThread.main(ActivityThread.java:5631)
     at java.lang.reflect.Method.invoke(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:372)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
07-09 08:29:15.195 21144-21144/com.example.khan.abc I/Process: Sending signal. PID: 21144 SIG: 9

This part of the log shows you a lot of information:

When the issue happened: 07-09 08:29:13.475

It is important to check when the issue happened... You may find several errors in a log... you must be sure that you are checking the proper messages :)

Which app crashed: com.example.khan.abc

This way, you know which app crashed (to be sure that you are checking the logs about your message)

Which ERROR: java.lang.NullPointerException

A NULL Pointer Exception error

Detailed info about the error: Attempt to invoke virtual method 'void android.support.v4.app.FragmentActivity.onBackPressed()' on a null object reference

You tried to call method onBackPressed() from a FragmentActivity object. However, that object was null when you did it.

Stack Trace: Stack Trace shows you the method invocation order... Sometimes, the error happens in the calling method (and not in the called method).

at com.example.khan.abc.AudioFragment$1.onClick(AudioFragment.java:125)

Error happened in file com.example.khan.abc.AudioFragment.java, inside onClick() method at line: 125 (stacktrace shows the line that error happened)

It was called by:

at android.view.View.performClick(View.java:4848)

Which was called by:

at android.view.View$PerformClick.run(View.java:20262)

which was called by:

at android.os.Handler.handleCallback(Handler.java:815)

etc....

Overview

This was just an overview... Not all logs are simple but the error gives specific problem and verbose shows up all problem ... It is just to share the idea and provide entry-level information to you...

I hope I could help you someway... Regards

CSS scale down image to fit in containing div, without specifing original size

This is an old question I know, but this is in the top five for several related Google searches. Here's the CSS-only solution without changing the images to background images:

width: auto;
height: auto;
max-width: MaxSize;
max-height: MaxSize;

"MaxSize" is a placeholder for whatever max-width and max-height you want to use, in pixels or percentage. auto will increase (or decrease) the width and height to occupy the space you specify with MaxSize. It will override any defaults for images you or the viewer's browser might have for images. I've found it's especially important on Android's Firefox. Pixels or percentages work for max size. With both the height and width set to auto, the aspect ratio of the original image will be retained.

If you want to fill the space entirely and don't mind the image being larger than its original size, change the two max-widths to min-width: 100% - this will make them completely occupy their space and maintain aspect ratio. You can see an example of this with a Twitter profile's background image.

How to override !important?

In any case, you can override height with max-height.

What is a regex to match ONLY an empty string?

Based on the most-approved answer, here is yet another way:

var result = !/[\d\D]/.test(string);  //[\d\D] will match any character

Iterate through the fields of a struct in Go

Taking Chetan Kumar solution and in case you need to apply to a map[string]int

package main

import (
    "fmt"
    "reflect"
)

type BaseStats struct {
    Hp           int
    HpMax        int
    Mp           int
    MpMax        int
    Strength     int
    Speed        int
    Intelligence int
}

type Stats struct {
    Base map[string]int
    Modifiers []string
}

func StatsCreate(stats BaseStats) Stats {
    s := Stats{
        Base: make(map[string]int),
    }

    //Iterate through the fields of a struct
    v := reflect.ValueOf(stats)
    typeOfS := v.Type()

    for i := 0; i< v.NumField(); i++ {
        val := v.Field(i).Interface().(int)
        s.Base[typeOfS.Field(i).Name] = val
    }
    return s
}

func (s Stats) GetBaseStat(id string) int {
    return s.Base[id]
}


func main() {
    m := StatsCreate(BaseStats{300, 300, 300, 300, 10, 10, 10})

    fmt.Println(m.GetBaseStat("Hp"))
}

Double exclamation points?

Alert after page load

There are three ways.
The first is to put the script tag on the bottom of the page:

<body>
<!--Body content-->
<script type="text/javascript">
alert('<%: TempData["Resultat"]%>');
</script>
</body>

The second way is to create an onload event:

<head>
<script type="text/javascript">
window.onload = function(){//window.addEventListener('load',function(){...}); (for Netscape) and window.attachEvent('onload',function(){...}); (for IE and Opera) also work
    alert('<%: TempData["Resultat"]%>');
}
</script>
</head>

It will execute a function when the window loads.
Finally, the third way is to create a readystatechange event and check the current document.readystate:

<head>
<script type="text/javascript">
document.onreadystatechange = function(){//window.addEventListener('readystatechange',function(){...}); (for Netscape) and window.attachEvent('onreadystatechange',function(){...}); (for IE and Opera) also work
    if(document.readyState=='loaded' || document.readyState=='complete')
        alert('<%: TempData["Resultat"]%>');
}
</script>
</head>

Storing Python dictionaries

If you're after serialization, but won't need the data in other programs, I strongly recommend the shelve module. Think of it as a persistent dictionary.

myData = shelve.open('/path/to/file')

# Check for values.
keyVar in myData

# Set values
myData[anotherKey] = someValue

# Save the data for future use.
myData.close()

Writing a string to a cell in excel

replace Range("A1") = "Asdf" with Range("A1").value = "Asdf"

CodeIgniter: Create new helper?

Create a file with the name of your helper in /application/helpers and add it to the autoload config file/load it manually.

E.g. place a file called user_helper.php in /application/helpers with this content:

<?php
  function pre($var)
  {
    echo '<pre>';
    if(is_array($var)) {
      print_r($var);
    } else {
      var_dump($var);
    }
    echo '</pre>';
  }
?>

Now you can either load the helper via $this->load->helper(‘user’); or add it to application/config/autoload.php config.

Is there a way to link someone to a YouTube Video in HD 1080p quality?

Yes there is:

https://www.youtube.com/embed/kObNpTFPV5c?vq=hd1440
https://www.youtube.com/embed/kObNpTFPV5c?vq=hd1080
etc...

Options are:

Code for 1440: vq=hd1440
Code for 1080: vq=hd1080
Code for 720: vq=hd720
Code for 480p: vq=large
Code for 360p: vq=medium
Code for 240p: vq=small

UPDATE
As of 10 of April 2018, this code still works.
Some users reported "not working", if it doesn't work for you, please read below:

From what I've learned, the problem is related with network speed and or screen size.
When YT player starts, it collects the network speed, screen and player sizes, among other information, if the connection is slow or the screen/player size smaller than the quality requested(vq=), a lower quality video is displayed despite the option selected on vq=.

Also make sure you read the comments below.

SyntaxError: missing ; before statement

too many ) parenthesis remove one of them.

rm: cannot remove: Permission denied

The code says everything:

max@serv$ chmod 777 .

Okay, it doesn't say everything.

In UNIX and Linux, the ability to remove a file is not determined by the access bits of that file. It is determined by the access bits of the directory which contains the file.

Think of it this way -- deleting a file doesn't modify that file. You aren't writing to the file, so why should "w" on the file matter? Deleting a file requires editing the directory that points to the file, so you need "w" on the that directory.

Confused about Service vs Factory

The basic difference, is that provider allows to set primitive (non-objects), array, or callback function values into the factory declared variable, and thus if returning an object it has to be explicitly declared and returned.

On the other hand a service can only be used to set the service declared variable to an object, thus we can avoid the explicit creation and returning of the objects, while on the other hand it allows usage of the this keyword.

Or in short words "provider is a more generic form while service is limited to objects only".

custom facebook share button

Given that we are in a php code context and the variable $url contains the link the user wants to share, you can try this to use a custom image :

<a class="facebook-share-button" href="https://www.facebook.com/sharer/sharer.php?u=<?php echo urlencode($url); ?>" target="_blank"><img src="/img/facebook-share-button.png" /></a>

or this for just plain text :

<a class="facebook-share-button" href="https://www.facebook.com/sharer/sharer.php?u=<?php echo urlencode($url); ?>" target="_blank">share</a>

You can also style the link purely with css.

The html code :

<a class="facebook-share-button" href="https://www.facebook.com/sharer/sharer.php?u=<?php echo urlencode($url); ?>" target="_blank"></a>

The css code :

.facebook-share-button {
    background-image: url("/img/facebook-share-button.png");
    display: inline-block;
    height: 32px;
    width: 32px;
}

.facebook-share-button:active,
.facebook-share-button:focus,
.facebook-share-button:hover {
    background-image: url("/img/facebook-share-button-hover.png");
}

In Django, how do I check if a user is in a certain group?

Your User object is linked to the Group object through a ManyToMany relationship.

You can thereby apply the filter method to user.groups.

So, to check if a given User is in a certain group ("Member" for the example), just do this :

def is_member(user):
    return user.groups.filter(name='Member').exists()

If you want to check if a given user belongs to more than one given groups, use the __in operator like so :

def is_in_multiple_groups(user):
    return user.groups.filter(name__in=['group1', 'group2']).exists()

Note that those functions can be used with the @user_passes_test decorator to manage access to your views :

from django.contrib.auth.decorators import login_required, user_passes_test
@login_required
@user_passes_test(is_member) # or @user_passes_test(is_in_multiple_groups)
def myview(request):
    # Do your processing

Hope this help

Assign one struct to another in C

Did you mean "Complex" as in complex number with real and imaginary parts? This seems unlikely, so if not you'd have to give an example since "complex" means nothing specific in terms of the C language.

You will get a direct memory copy of the structure; whether that is what you want depends on the structure. For example if the structure contains a pointer, both copies will point to the same data. This may or may not be what you want; that is down to your program design.

To perform a 'smart' copy (or a 'deep' copy), you will need to implement a function to perform the copy. This can be very difficult to achieve if the structure itself contains pointers and structures that also contain pointers, and perhaps pointers to such structures (perhaps that's what you mean by "complex"), and it is hard to maintain. The simple solution is to use C++ and implement copy constructors and assignment operators for each structure or class, then each one becomes responsible for its own copy semantics, you can use assignment syntax, and it is more easily maintained.

Unresolved external symbol on static class members

Static data members declarations in the class declaration are not definition of them. To define them you should do this in the .CPP file to avoid duplicated symbols.

The only data you can declare and define is integral static constants. (Values of enums can be used as constant values as well)

You might want to rewrite your code as:

class test {
public:
  const static unsigned char X = 1;
  const static unsigned char Y = 2;
  ...
  test();
};

test::test() {
}

If you want to have ability to modify you static variables (in other words when it is inappropriate to declare them as const), you can separate you code between .H and .CPP in the following way:

.H :

class test {
public:

  static unsigned char X;
  static unsigned char Y;

  ...

  test();
};

.CPP :

unsigned char test::X = 1;
unsigned char test::Y = 2;

test::test()
{
  // constructor is empty.
  // We don't initialize static data member here, 
  // because static data initialization will happen on every constructor call.
}

Dictionary text file

There's also WordNet. Its data files format are well-documented.
I used it for building an embeddable dictionary library for iOS developers (www.lexicontext.com) and also in one of my apps.

Do sessions really violate RESTfulness?

HTTP transaction, basic access authentication, is not suitable for RBAC, because basic access authentication uses the encrypted username:password every time to identify, while what is needed in RBAC is the Role the user wants to use for a specific call. RBAC does not validate permissions on username, but on roles.

You could tric around to concatenate like this: usernameRole:password, but this is bad practice, and it is also inefficient because when a user has more roles, the authentication engine would need to test all roles in concatenation, and that every call again. This would destroy one of the biggest technical advantages of RBAC, namely a very quick authorization-test.

So that problem cannot be solved using basic access authentication.

To solve this problem, session-maintaining is necessary, and that seems, according to some answers, in contradiction with REST.

That is what I like about the answer that REST should not be treated as a religion. In complex business cases, in healthcare, for example, RBAC is absolutely common and necessary. And it would be a pity if they would not be allowed to use REST because all REST-tools designers would treat REST as a religion.

For me there are not many ways to maintain a session over HTTP. One can use cookies, with a sessionId, or a header with a sessionId.

If someone has another idea I will be glad to hear it.

Change background position with jQuery

You guys are complicating things. You can simple do this from CSS.

#carousel li { background-position:0px 0px; }
#carousel li:hover { background-position:100px 0px; }

AWS S3: how do I see how much disk space is using

On linux box that have python (with pip installer), grep and awk, install AWS CLI (command line tools for EC2, S3 and many other services)

sudo pip install awscli

then create a .awssecret file in your home folder with content as below (adjust key, secret and region as needed):

[default]
aws_access_key_id=<YOUR_KEY_HERE>
aws_secret_access_key=<YOUR_SECRET_KEY_HERE>
region=<AWS_REGION>

Make this file read-write to your user only:

sudo chmod 600 .awssecret

and export it to your environment

 export AWS_CONFIG_FILE=/home/<your_name>/.awssecret

then run in the terminal (this is a single line command, separated by \ for easy reading here):

aws s3 ls s3://<bucket_name>/foo/bar | \
grep -v -E "(Bucket: |Prefix: |LastWriteTime|^$|--)" | \
awk 'BEGIN {total=0}{total+=$3}END{print total/1024/1024" MB"}'

the aws part lists the bucket (or optionally a 'sub-folder')
the grep part removes (using -v) the lines that match the Regular Expression (using -E). ^$ is for blank line, -- is for the separator lines in the output of aws s3 ls
the last awk simply add to total the 3rd colum of the resulting output (the size in KB) then display it at the end

NOTE this command works for the current bucket or 'folder', not recursively

C++11 rvalues and move semantics confusion (return statement)

First example

std::vector<int> return_vector(void)
{
    std::vector<int> tmp {1,2,3,4,5};
    return tmp;
}

std::vector<int> &&rval_ref = return_vector();

The first example returns a temporary which is caught by rval_ref. That temporary will have its life extended beyond the rval_ref definition and you can use it as if you had caught it by value. This is very similar to the following:

const std::vector<int>& rval_ref = return_vector();

except that in my rewrite you obviously can't use rval_ref in a non-const manner.

Second example

std::vector<int>&& return_vector(void)
{
    std::vector<int> tmp {1,2,3,4,5};
    return std::move(tmp);
}

std::vector<int> &&rval_ref = return_vector();

In the second example you have created a run time error. rval_ref now holds a reference to the destructed tmp inside the function. With any luck, this code would immediately crash.

Third example

std::vector<int> return_vector(void)
{
    std::vector<int> tmp {1,2,3,4,5};
    return std::move(tmp);
}

std::vector<int> &&rval_ref = return_vector();

Your third example is roughly equivalent to your first. The std::move on tmp is unnecessary and can actually be a performance pessimization as it will inhibit return value optimization.

The best way to code what you're doing is:

Best practice

std::vector<int> return_vector(void)
{
    std::vector<int> tmp {1,2,3,4,5};
    return tmp;
}

std::vector<int> rval_ref = return_vector();

I.e. just as you would in C++03. tmp is implicitly treated as an rvalue in the return statement. It will either be returned via return-value-optimization (no copy, no move), or if the compiler decides it can not perform RVO, then it will use vector's move constructor to do the return. Only if RVO is not performed, and if the returned type did not have a move constructor would the copy constructor be used for the return.

How to add a Browse To File dialog to a VB.NET application

You're looking for the OpenFileDialog class.

For example:

Sub SomeButton_Click(sender As Object, e As EventArgs) Handles SomeButton.Click
    Using dialog As New OpenFileDialog
        If dialog.ShowDialog() <> DialogResult.OK Then Return
        File.Copy(dialog.FileName, newPath)
    End Using
End Sub

Maven does not find JUnit tests to run

Here's the exact code I had to add to my pom.xml:

    <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.21.0</version>
            <dependencies>
                <dependency>
                    <groupId>org.junit.platform</groupId>
                    <artifactId>junit-platform-surefire-provider</artifactId>
                    <version>1.2.0-M1</version>
                </dependency>
                <dependency>
                    <groupId>org.junit.jupiter</groupId>
                    <artifactId>junit-jupiter-engine</artifactId>
                    <version>5.2.0</version>
                </dependency>
            </dependencies>
        </plugin>
    </plugins>
</build>

And here's my dependencies:

    <dependencies>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.2.0</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.easytesting</groupId>
        <artifactId>fest-assert-core</artifactId>
        <version>2.0M10</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.junit.platform</groupId>
        <artifactId>junit-platform-surefire-provider</artifactId>
        <version>1.2.0-M1</version>
    </dependency>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>5.2.0-M1</version>
    </dependency>
</dependencies>

How to update npm

To get the latest stable version just run

npm install npm@latest -g

It worked just fine for me!

Define a global variable in a JavaScript function

Just declare it outside the functions, and assign values inside the functions. Something like:

<script type="text/javascript">
    var offsetfrommouse = [10, -20];
    var displayduration = 0;
    var obj_selected = 0;
    var trailimage = null ;  // Global variable
    function makeObj(address) {
        trailimage = [address, 50, 50];  // Assign value

Or simply removing "var" from your variable name inside function also makes it global, but it is better to declare it outside once for cleaner code. This will also work:

var offsetfrommouse = [10, -20];
var displayduration = 0;
var obj_selected = 0;

function makeObj(address) {
    trailimage = [address, 50, 50];  // Global variable, assign value

I hope this example explains more: http://jsfiddle.net/qCrGE/

var globalOne = 3;
testOne();

function testOne()
{
    globalOne += 2;
    alert("globalOne is :" + globalOne );
    globalOne += 1;
}

alert("outside globalOne is: " + globalOne);

testTwo();

function testTwo()
{
    globalTwo = 20;
    alert("globalTwo is " + globalTwo);
    globalTwo += 5;
}

alert("outside globalTwo is:" + globalTwo);

Deserialize JSON into C# dynamic object?

Another way using Newtonsoft.Json:

dynamic stuff = Newtonsoft.Json.JsonConvert.DeserializeObject("{ color: 'red', value: 5 }");
string color = stuff.color;
int value = stuff.value;

TypeScript sorting an array

The easiest way seems to be subtracting the second number from the first:

var numericArray:Array<number> = [2,3,4,1,5,8,11];

var sorrtedArray:Array<number> = numericArray.sort((n1,n2) => n1 - n2);

https://alligator.io/js/array-sort-numbers/

How to drop a table if it exists?

Is it correct to do the following?
IF EXISTS(SELECT *
          FROM   dbo.Scores)
  DROP TABLE dbo.Scores

No. That will drop the table only if it contains any rows (and will raise an error if the table does not exist).

Instead, for a permanent table you can use

IF OBJECT_ID('dbo.Scores', 'U') IS NOT NULL 
  DROP TABLE dbo.Scores;

Or, for a temporary table you can use

IF OBJECT_ID('tempdb.dbo.#TempTableName', 'U') IS NOT NULL
  DROP TABLE #TempTableName;

SQL Server 2016+ has a better way, using DROP TABLE IF EXISTS …. See the answer by @Jovan.

semaphore implementation

Vary the consumer-rate and the producer-rate (using sleep), to better understand the operation of code. The code below is the consumer-producer simulation (over a max-limit on container).

Code for your reference:

#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>

sem_t semP, semC;
int stock_count = 0;
const int stock_max_limit=5;

void *producer(void *arg) {
    int i, sum=0;
    for (i = 0; i < 10; i++) {

        while(stock_max_limit == stock_count){
            printf("stock overflow, production on wait..\n");
            sem_wait(&semC);
            printf("production operation continues..\n");
        }

        sleep(1);   //production decided here
        stock_count++;
        printf("P::stock-count : %d\n",stock_count);
        sem_post(&semP);
        printf("P::post signal..\n");
    }
 }

void *consumer(void *arg) {
    int i, sum=0;
    for (i = 0; i < 10; i++) {

        while(0 == stock_count){
            printf("stock empty, consumer on wait..\n");
            sem_wait(&semP);
            printf("consumer operation continues..\n");
        }

        sleep(2);   //consumer rate decided here
        stock_count--;
        printf("C::stock-count : %d\n", stock_count);
        sem_post(&semC);
        printf("C::post signal..\n");
        }
}

int main(void) {

    pthread_t tid0,tid1;
    sem_init(&semP, 0, 0);
    sem_init(&semC, 0, 0);

        pthread_create(&tid0, NULL, consumer, NULL);
        pthread_create(&tid1, NULL, producer, NULL);
        pthread_join(tid0, NULL);
        pthread_join(tid1, NULL);

    sem_destroy(&semC);
    sem_destroy(&semP);

    return 0;
}

Replacing column values in a pandas DataFrame

This should also work:

w.female[w.female == 'female'] = 1 
w.female[w.female == 'male']   = 0

How do I add the contents of an iterable to a set?

You can use the set() function to convert an iterable into a set, and then use standard set update operator (|=) to add the unique values from your new set into the existing one.

>>> a = { 1, 2, 3 }
>>> b = ( 3, 4, 5 )
>>> a |= set(b)
>>> a
set([1, 2, 3, 4, 5])

Create a HTML table where each TR is a FORM

If you can use javascript and strictly require it on your web, you can put textboxes, checkboxes and whatever on each row of your table and at the end of each row place button (or link of class rowSubmit) "save". Without any FORM tag. Form than will be simulated by JS and Ajax like this:

<script type="text/javascript">
$(document).ready(function(){
  $(".rowSubmit").click(function()
  {
     var form = '<form><table><tr>' + $(this).closest('tr').html() + '</tr></table></form>';
     var serialized = $(form).serialize(); 
     $.get('url2action', serialized, function(data){
       // ... can be empty
     }); 
   });
});        
</script>

What do you think?

PS: If you write in jQuery this:

$("valid HTML string")
$(variableWithValidHtmlString)

It will be turned into jQuery object and you can work with it as you are used to in jQuery.

Launching Google Maps Directions via an intent on Android

if you know point A, point B (and whatever features or tracks in between) you can use a KML file along with your intent.

String kmlWebAddress = "http://www.afischer-online.de/sos/AFTrack/tracks/e1/01.24.Soltau2Wietzendorf.kml";
String uri = String.format(Locale.ENGLISH, "geo:0,0?q=%s",kmlWebAddress);
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(intent);

for more info, see this SO answer

NOTE: this example uses a sample file that (as of mar13) is still online. if it has gone offline, find a kml file online and change your url

Downloading Java JDK on Linux via wget is shown license page instead

Context

I recently faced the same problem and although the comments on this page and some others provided helpful hints - I thought it would be good to document the steps I took to fix the problem for folks who may be in need of further help.

System Details

I am following the PNDA set up on AWS by following the step by step pnda installation guide at:

https://github.com/pndaproject/pnda-guide/blob/develop/provisioning/aws/PREPARE.md

I am using ubuntu 14.04 [free tier eligible] on AWS cloud, and am running the code from 64 bit windows8.1 laptop. I am using PUTTY to connect to the server instance. I git cloned the pnda code from https://github.com/pndaproject/pnda to the ubuntu instance.

Important Note Please note that if you plan to use Ubuntu instance on AWS make sure it's 14.04 only. If you use version 16, it does not work. I learnt it the hard way!

Resolution Steps

As those who have gone as far as to have encountered the error being discussed here would know - the mirror creation file involves the following steps -

1) Run the script create_mirror.sh [ sudo su -s ./create_mirror.sh ] to run the full mirror creation process

2) This script in turn calls various other scripts - one of them being create_mirror_misc.sh; this script refers to pnda-static-file-dependencies.txt which has a list of files to be downloaded.

3) On the very first line of the pnda-static-file-dependencies.txt is a reference to download the jdk-8u131-linux-x64.tar.gz file from http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz oraclelicense=accept-securebackup-cookie; It is at this point that my script was failing with the message Failed to download http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz after 3 retries

4) I browsed to the page http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz and found the following error message displayed **In order to download products from Oracle Technology Network you must agree to the OTN license terms**

5) To resolve this problem I made the following change to the pnda-static-file-dependencies.txt; I added --no-check-certificate --no-cookies to bypass the license term agreement condition

6) So the revised code looks like - http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz --no-check-certificate --no-cookies oraclelicense=accept-securebackup-cookie

I hope this is helpful.

Error: Selection does not contain a main type

If you are working with a Maven project you have to understand the fact that directory layout is bit different. In this the package name must be src/main/java.

For this update your source folder by right click on project root folder -> properties -> java build path -> source tab. Here remove all other source folders as they might have been added in wrong manner. Now, select project /src/main/java as the source folder. Add and apply the changes. Now refresh your workspace using F5.

This should fix the issue of not recognizing a main type.

how to implement Interfaces in C++?

C++ has no built-in concepts of interfaces. You can implement it using abstract classes which contains only pure virtual functions. Since it allows multiple inheritance, you can inherit this class to create another class which will then contain this interface (I mean, object interface :) ) in it.

An example would be something like this -

class Interface
{
public:
    Interface(){}
    virtual ~Interface(){}
    virtual void method1() = 0;    // "= 0" part makes this method pure virtual, and
                                   // also makes this class abstract.
    virtual void method2() = 0;
};

class Concrete : public Interface
{
private:
    int myMember;

public:
    Concrete(){}
    ~Concrete(){}
    void method1();
    void method2();
};

// Provide implementation for the first method
void Concrete::method1()
{
    // Your implementation
}

// Provide implementation for the second method
void Concrete::method2()
{
    // Your implementation
}

int main(void)
{
    Interface *f = new Concrete();

    f->method1();
    f->method2();

    delete f;

    return 0;
}

Vue Js - Loop via v-for X times (in a range)

I have solved it with Dov Benjamin's help like that:

<ul>
  <li v-for="(n,index) in 2">{{ object.price }}</li>
</ul>

And another method, for both V1.x and 2.x of vue.js

Vue 1:

<p v-for="item in items | limitBy 10">{{ item }}</p>

Vue2:

// Via slice method in computed prop

<p v-for="item in filteredItems">{{ item }}</p>

computed: {
   filteredItems: function () {
     return this.items.slice(0, 10)
     }
  }

How do I convert Word files to PDF programmatically?

Microsoft PDF add-in for word seems to be the best solution for now but you should take into consideration that it does not convert all word documents correctly to pdf and in some cases you will see huge difference between the word and the output pdf. Unfortunately I couldn't find any api that would convert all word documents correctly. The only solution I found to ensure the conversion was 100% correct was by converting the documents through a printer driver. The downside is that documents are queued and converted one by one, but you can be sure the resulted pdf is exactly the same as word document layout. I personally preferred using UDC (Universal document converter) and installed Foxit Reader(free version) on server too then printed the documents by starting a "Process" and setting its Verb property to "print". You can also use FileSystemWatcher to set a signal when the conversion has completed.

VB.net Need Text Box to Only Accept Numbers

On each entry in textbox (event - Handles RestrictedTextBox.TextChanged), you can do a try to caste entered text into integer, if failure occurs, you just reset the value of the text in RestrictedTextBox to last valid entry (which gets constantly updating under the temp1 variable).

Here's how to go about it. In the sub that loads with the form (me.load or mybase.load), initialize temp1 to the default value of RestrictedTextBox.Text

Dim temp1 As Integer 'initialize temp1 default value, you should do this after the default value for RestrictedTextBox.Text was loaded.
If (RestrictedTextBox.Text = Nothing) Then 
    temp1 = Nothing
Else
    Try 
        temp1 = CInt(RestrictedTextBox.Text)
    Catch ex As Exception
        temp1 = Nothing
    End Try
End If

At any other point in form:

Private Sub textBox_TextChanged(sender As System.Object, e As System.EventArgs) Handles RestrictedTextBox.TextChanged
    Try
        temp1 = CInt(RestrictedTextBox.Text) 'If user inputs integer, this will succeed and temp will be updated
    Catch ex As Exception
        RestrictedTextBox.Text = temp1.ToString 'If user inputs non integer, textbox will be reverted to state the state it was in before the string entry
    End Try
End Sub

The nice thing about this is that you can use this to restrict a textbox to any type you want: double, uint etc....

Retrofit 2 - Dynamic URL

Dynamic URL with Get and Post method in Retrofit (MVVM)

Retrofit Service interface:

public interface NetworkAPIServices {

@POST()
Observable<JsonElement> executXYZServiceAPI(@Url String url,@Body AuthTokenRequestModel param);


@GET
Observable<JsonElement> executeInserInfo(@Url String url);

MVVM service class:

   public Observable<JsonElement> executXYZServiceAPI(ModelObject object) {
    return networkAPIServices.authenticateAPI("url",
            object);
}

 public Observable<JsonElement> executeInserInfo(String ID) {
    return networkAPIServices.getBank(DynamicAPIPath.mergeUrlPath("url"+ID)));
}

and Retrofit Client class

 @Provides
@Singleton
@Inject
@Named("provideRetrofit2")
Retrofit provideRetrofit(@Named("provideRetrofit2") Gson gson, @Named("provideRetrofit2") OkHttpClient okHttpClient) {


   builder = new Retrofit.Builder();
    if (BaseApplication.getInstance().getApplicationMode() == ApplicationMode.DEVELOPMENT) {
        builder.baseUrl(NetworkURLs.BASE_URL_UAT);
    } else {
        builder.baseUrl(NetworkURLs.BASE_URL_PRODUCTION);
    }


    builder.addCallAdapterFactory(RxJava2CallAdapterFactory.create());
    builder.client(okHttpClient);
    builder.addConverterFactory(GsonConverterFactory.create(gson));


    return builder.build();
}

for example This is url : https://gethelp.wildapricot.com/en/articles/549-changing-your

baseURL : https://gethelp.wildapricot.com

Remaining @Url: /en/articles/549-changing-your (which is you pass in retro service class)

android set button background programmatically

button.setBackgroundColor(getResources().getColor(R.color.red);

Sets the background color for this view. Parameters: color the color of the background

R.color.red is a reference generated at the compilation in gen.

Quickly create a large file on a Linux system

Linux & all filesystems

xfs_mkfile 10240m 10Gigfile

Linux & and some filesystems (ext4, xfs, btrfs and ocfs2)

fallocate -l 10G 10Gigfile

OS X, Solaris, SunOS and probably other UNIXes

mkfile 10240m 10Gigfile

HP-UX

prealloc 10Gigfile 10737418240

Explanation

Try mkfile <size> myfile as an alternative of dd. With the -n option the size is noted, but disk blocks aren't allocated until data is written to them. Without the -n option, the space is zero-filled, which means writing to the disk, which means taking time.

mkfile is derived from SunOS and is not available everywhere. Most Linux systems have xfs_mkfile which works exactly the same way, and not just on XFS file systems despite the name. It's included in xfsprogs (for Debian/Ubuntu) or similar named packages.

Most Linux systems also have fallocate, which only works on certain file systems (such as btrfs, ext4, ocfs2, and xfs), but is the fastest, as it allocates all the file space (creates non-holey files) but does not initialize any of it.

Keep only first n characters in a string?

You can use .substring, which returns a potion of a string:

"abcdefghijklmnopq".substring(0, 8) === "abcdefgh"; // portion from index 0 to 8

Problems with Android Fragment back stack

I think, when I read your story that [3] is also on the backstack. This explains why you see it flashing up.

Solution would be to never set [3] on the stack.

Where do I download JDBC drivers for DB2 that are compatible with JDK 1.5?

official Link of DB 2 JDBC Driver from IBM

Algorithm to generate all possible permutations of a list?

this is a java version for permutation

public class Permutation {

    static void permute(String str) {
        permute(str.toCharArray(), 0, str.length());
    }

    static void permute(char [] str, int low, int high) {
        if (low == high) {
            System.out.println(str);
            return;
        }

        for (int i=low; i<high; i++) {
            swap(str, i, low);
            permute(str, low+1, high);
            swap(str, low, i);
        }

    }

    static void swap(char [] array, int i, int j) {
        char t = array[i];
        array[i] = array[j];
        array[j] = t;
    }
}

super() fails with error: TypeError "argument 1 must be type, not classobj" when parent does not inherit from object

Also, if you can't change class B, you can fix the error by using multiple inheritance.

class B:
    def meth(self, arg):
        print arg

class C(B, object):
    def meth(self, arg):
        super(C, self).meth(arg)

print C().meth(1)

Java Minimum and Maximum values in Array

import java.util.*;
class Maxmin
{
    public static void main(String args[])
    {
        int[] arr = new int[10];
        Scanner in = new Scanner(System.in);
        int i, min=0, max=0;
        for(i=0; i<=arr.length; i++)
        {
            System.out.print("Enter any number: ");
            arr[i] = in.nextInt();          
        }
        min = arr[0];
        for(i=0; i<=9; i++)
        {
            if(arr[i] > max)
            {
                max = arr[i];
            }
            if(arr[i] < min)
            {
                min = arr[i];
            }
        }
        System.out.println("Maximum is: " + max);
        System.out.println("Minimum is: " + min);
    }
}

Position a CSS background image x pixels from the right?

There is one way but it's not supported on every browser (see coverage here)

element {
  background-position : calc(100% - 10px) 0;
}

It works in every modern browser, but it is possible that IE9 is crashing. Also no coverage for =< IE8.

Set the space between Elements in Row Flutter

I believe the original post was about removing the space between the buttons in a row, not adding space.

The trick is that the minimum space between the buttons was due to padding built into the buttons as part of the material design specification.

So, don't use buttons! But a GestureDetector instead. This widget type give the onClick / onTap functionality but without the styling.

See this post for an example.

https://stackoverflow.com/a/56001817/766115

Getting Cannot read property 'offsetWidth' of undefined with bootstrap carousel script

"Change to if (typeof $next == 'object' && $next.length) $next[0].offsetWidth" -did not help. if you convert Bootstrap 3 to php(for WordPress theme), when adding WP_Query ($loop = new WP_Query( $args );) insert $count = 0;. And and at the end before endwhile; add $count++;.

How to set CATALINA_HOME variable in windows 7?

In order to set CATALINA_HOME:

First, unzip and paste the apache-tomcat-7.1.100 folder in your C:// drive folder.

NOTE: Do not place your apache tomcat folder within any other folder or drive, place it directly in C:// drive folder only. (I did this mistake and none of the above-mentioned solutions were working).

Open environment variable dialog box (windows key+ pause-break key --> advanced setting).
Add a new variable name as "CATALINA_HOME" and add the variable path as "C://apache-tomcat-7.1.100"(as in my case), in System Variables.
Edit PATH variable name add "%CATALINA_HOME%\bin" and press OK.
Close the window and it will be saved.
Open Command Prompt window and type command- "%CATALINA_HOME%\bin\startup.bat" to run and start the Tomcat server.
END!

Adding onClick event dynamically using jQuery

let a = $("<a>bfCaptchaEntry</a>");
a.attr("onClick", "function(" + someParameter+ ")");

What does the clearfix class do in css?

How floats work

When floating elements exist on the page, non-floating elements wrap around the floating elements, similar to how text goes around a picture in a newspaper. From a document perspective (the original purpose of HTML), this is how floats work.

`float` vs `display:inline`

Before the invention of display:inline-block, websites use float to set elements beside each other. float is preferred over display:inline since with the latter, you can't set the element's dimensions (width and height) as well as vertical paddings (top and bottom) - which floated elements can do since they're treated as block elements.

Float problems

The main problem is that we're using float against its intended purpose.

Another is that while float allows side-by-side block-level elements, floats do not impart shape to its container. It's like position:absolute, where the element is "taken out of the layout". For instance, when an empty container contains a floating 100px x 100px <div>, the <div> will not impart 100px in height to the container.

Unlike position:absolute, it affects the content that surrounds it. Content after the floated element will "wrap" around the element. It starts by rendering beside it and then below it, like how newspaper text would flow around an image.

Clearfix to the rescue

What clearfix does is to force content after the floats or the container containing the floats to render below it. There are a lot of versions for clear-fix, but it got its name from the version that's commonly being used - the one that uses the CSS property clear.

Examples

Here are several ways to do clearfix , depending on the browser and use case. One only needs to know how to use the clear property in CSS and how floats render in each browser in order to achieve a perfect cross-browser clear-fix.

What you have

Your provided style is a form of clearfix with backwards compatibility. I found an article about this clearfix. It turns out, it's an OLD clearfix - still catering the old browsers. There is a newer, cleaner version of it in the article also. Here's the breakdown:

The first clearfix you have appends an invisible pseudo-element, which is styled clear:both, between the target element and the next element. This forces the pseudo-element to render below the target, and the next element below the pseudo-element.
The second one appends the style display:inline-block which is not supported by earlier browsers. inline-block is like inline but gives you some properties that block elements, like width, height as well as vertical padding. This was targeted for IE-MAC.
This was the reapplication of display:block due to IE-MAC rule above. This rule was "hidden" from IE-MAC.

All in all, these 3 rules keep the .clearfix working cross-browser, with old browsers in mind.

Nginx no-www to www and www to no-www

location / { 
    if ($http_host !~ "^www.domain.com"){ 
        rewrite ^(.*)$ $scheme://www.domain.com/$1 redirect; 
    } 
}

Dynamic SQL results into temp table in SQL Stored procedure

INSERT INTO #TempTable
EXEC(@SelectStatement)

Tensorflow: Using Adam optimizer

You need to call tf.global_variables_initializer() on you session, like

init = tf.global_variables_initializer()
sess.run(init)

Full example is available in this great tutorial https://www.tensorflow.org/get_started/mnist/mechanics

IntelliJ, can't start simple web application: Unable to ping server at localhost:1099

My problem was that tomcat 8 and higher are not compatible with java 6. Changing to java 7 solved it.

How to avoid pressing Enter with getchar() for reading a single character only?

This depends on your OS, if you are in a UNIX like environment the ICANON flag is enabled by default, so input is buffered until the next '\n' or EOF. By disabling the canonical mode you will get the characters immediately. This is also possible on other platforms, but there is no straight forward cross-platform solution.

EDIT: I see you specified that you use Ubuntu. I just posted something similar yesterday, but be aware that this will disable many default behaviors of your terminal.

#include<stdio.h>
#include <termios.h>            //termios, TCSANOW, ECHO, ICANON
#include <unistd.h>     //STDIN_FILENO


int main(void){   
    int c;   
    static struct termios oldt, newt;

    /*tcgetattr gets the parameters of the current terminal
    STDIN_FILENO will tell tcgetattr that it should write the settings
    of stdin to oldt*/
    tcgetattr( STDIN_FILENO, &oldt);
    /*now the settings will be copied*/
    newt = oldt;

    /*ICANON normally takes care that one line at a time will be processed
    that means it will return if it sees a "\n" or an EOF or an EOL*/
    newt.c_lflag &= ~(ICANON);          

    /*Those new settings will be set to STDIN
    TCSANOW tells tcsetattr to change attributes immediately. */
    tcsetattr( STDIN_FILENO, TCSANOW, &newt);

    /*This is your part:
    I choose 'e' to end input. Notice that EOF is also turned off
    in the non-canonical mode*/
    while((c=getchar())!= 'e')      
        putchar(c);                 

    /*restore the old settings*/
    tcsetattr( STDIN_FILENO, TCSANOW, &oldt);


    return 0;
}

You will notice, that every character appears twice. This is because the input is immediately echoed back to the terminal and then your program puts it back with putchar() too. If you want to disassociate the input from the output, you also have to turn of the ECHO flag. You can do this by simply changing the appropriate line to:

newt.c_lflag &= ~(ICANON | ECHO);

Resize image proportionally with CSS?

image_tag("/icons/icon.gif", height: '32', width: '32') I need to set height: '50px', width: '50px' to image tag and this code works from first try note I tried all the above code but no luck so this one works and here is my code from my _nav.html.erb:
<%= image_tag("#{current_user.image}", height: '50px', width: '50px') %>

Why can't I use the 'await' operator within the body of a lock statement?

I assume this is either difficult or impossible for the compiler team to implement for some reason.

No, it is not at all difficult or impossible to implement -- the fact that you implemented it yourself is a testament to that fact. Rather, it is an incredibly bad idea and so we don't allow it, so as to protect you from making this mistake.

call to Monitor.Exit within ExitDisposable.Dispose seems to block indefinitely (most of the time) causing deadlocks as other threads attempt to acquire the lock. I suspect the unreliability of my work around and the reason await statements are not allowed in lock statement are somehow related.

Correct, you have discovered why we made it illegal. Awaiting inside a lock is a recipe for producing deadlocks.

I'm sure you can see why: arbitrary code runs between the time the await returns control to the caller and the method resumes. That arbitrary code could be taking out locks that produce lock ordering inversions, and therefore deadlocks.

Worse, the code could resume on another thread (in advanced scenarios; normally you pick up again on the thread that did the await, but not necessarily) in which case the unlock would be unlocking a lock on a different thread than the thread that took out the lock. Is that a good idea? No.

I note that it is also a "worst practice" to do a yield return inside a lock, for the same reason. It is legal to do so, but I wish we had made it illegal. We're not going to make the same mistake for "await".

Bootstrap dropdown sub menu missing

I bumped with this issue a few days ago. I tried many solutions and none really worked for me on the end i ended up creating an extenion/override of the dropdown code of bootstrap. It is a copy of the original code with changes to the closeMenus function.

I think it is a good solution since it doesn't affects the core classes of bootstrap js.

You can check it out on gihub: https://github.com/djokodonev/bootstrap-multilevel-dropdown

Function to check if a string is a date

if (strtotime($date)>strtotime(0)) { echo 'it is a date' }

Is there a Python caching library?

No one has mentioned shelve yet. https://docs.python.org/2/library/shelve.html

It isn't memcached, but looks much simpler and might fit your need.

Convert PEM traditional private key to PKCS8 private key

Try using following command. I haven't tried it but I think it should work.

openssl pkcs8 -topk8 -inform PEM -outform DER -in filename -out filename -nocrypt

How do I get the Date & Time (VBS)

This is an old question but alot of the answers in here use VB or VBA. The tag says vbscript (which is how I got here).

The answers here got kind of muddled since VB is super broad where you can have so many applications of it. My answer is solely on vbscript and accomplishes my case of formatting in YYYYMMDD in vbscript

Sharing what I've learned:

There are all the DateTime functions in vbscript defined here so you can mix-n-match to get the result that you want
What I needed was to get the current date and format it in YYYYMMDD to do that I just needed to concat DatePart like so for the current Date: date = DatePart("yyyy",Date) & DatePart("m",Date) & DatePart("d",Date)

That's all, I hope this helps someone.

<meta charset="utf-8"> vs <meta http-equiv="Content-Type">

Another reason to go with the short one is that it matches other instances where you might specify a character set in markup. For example:

<script type="javascript" charset="UTF-8" src="/script.js"></script>

<p><a charset="UTF-8" href="http://example.com/">Example Site</a></p>

Consistency helps to reduce errors and make code more readable.

Note that the charset attribute is case-insensitive. You can use UTF-8 or utf-8, however UTF-8 is clearer, more readable, more accurate.

Also, there is absolutely no reason at all to use any value other than UTF-8 in the meta charset attribute or page header. UTF-8 is the default encoding for Web documents since HTML4 in 1999 and the only practical way to make modern Web pages.

Also you should not use HTML entities in UTF-8. Characters like the copyright symbol should be typed directly. The only entities you should use are for the 5 reserved markup characters: less than, greater than, ampersand, prime, double prime. Entities need an HTML parser, which you may not always want to use going forward, they introduce errors, make your code less readable, increase your file sizes, and sometimes decode incorrectly in various browsers depending on which entities you used. Learn how to type/insert copyright, trademark, open quote, close quote, apostrophe, em dash, en dash, bullet, Euro, and any other characters you encounter in your content, and use those actual characters in your code. The Mac has a Character Viewer that you can turn on in the Keyboard System Preference, and you can find and then drag and drop the characters you need, or use the matching Keyboard Viewer to see which keys to type. For example, trademark is Option+2. UTF-8 contains all of the characters and symbols from every written human language. So there is no excuse for using -- instead of an em dash. It is not a bad idea to learn the rules of punctuation and typography also ... for example, knowing that a period goes inside a close quote, not outside.

Using a tag for something like content-type and encoding is highly ironic, since without knowing those things, you couldn't parse the file to get the value of the meta tag.

No, that is not true. The browser starts out parsing the file as the browser's default encoding, either UTF-8 or ISO-8859-1. Since US-ASCII is a subset of both ISO-8859-1 and UTF-8, the browser can read just fine either way ... it is the same. When the browser encounters the meta charset tag, if the encoding is different than what the browser is already using, the browser reloads the page in the specified encoding. That is why we put the meta charset tag at the top, right after the head tag, before anything else, even the title. That way you can use UTF-8 characters in your title.

You must save your file(s) in UTF-8 encoding without BOM

That is not strictly true. If you only have US-ASCII characters in your document, you can Save it as US-ASCII and serve it as UTF-8, because it is a subset. But if there are Unicode characters, you are correct, you must Save as UTF-8 without BOM.

If you want a good text editor that will save your files in UTF-8, I recommend Notepad++.

On the Mac, use Bare Bones TextWrangler (free) from Mac App Store, or Bare Bones BBEdit which is at Mac App Store for $39.99 ... very cheap for such a great tool. In either app, there is a menu at the bottom of the document window where you specify the document encoding and you can easily choose "UTF-8 no BOM". And of course you can set that as the default for new documents in Preferences.

But if your Webserver serves the encoding in the HTTP header, which is recommended, both [meta tags] are needless.

That is incorrect. You should of course set the encoding in the HTTP header, but you should also set it in the meta charset attribute so that the page can be Saved by the user, out of the browser onto local storage and then Opened again later, in which case the only indication of the encoding that will be present is the meta charset attribute. You should also set a base tag for the same reason ... on the server, the base tag is unnecessary, but when opened from local storage, the base tag enables the page to work as if it is on the server, with all the assets in place and so on, no broken links.

AddDefaultCharset UTF-8

Or you can just change the encoding of particular file types like so:

AddType text/html;charset=utf-8 html

A tip for serving both UTF-8 and Latin-1 (ISO-8859-1) files is to give the UTF-8 files a "text" extension and Latin-1 files "txt."

AddType text/plain;charset=iso-8859-1 txt
AddType text/plain;charset=utf-8 text

Finally, consider Saving your documents with Unix line endings, not legacy DOS or (classic) Mac line endings, which don't help and may hurt, especially down the line as we get further and further from those legacy systems. An HTML document with valid HTML5, UTF-8 encoding, and Unix line endings is a job well done. You can share and edit and store and read and recover and rely on that document in many contexts. It's lingua franca. It's digital paper.

Java default constructor

A default constructor does not take any arguments:

public class Student { 
    // default constructor
    public Student() {   

    }
}

How to select a div element in the code-behind page?

If you want to find the control from code behind you have to use runat="server" attribute on control. And then you can use Control.FindControl.

<div class="tab-pane active" id="portlet_tab1" runat="server">

Control myControl1 = FindControl("portlet_tab1");
if(myControl1!=null)
{
    //do stuff
}

If you use runat server and your control is inside the ContentPlaceHolder you have to know the ctrl name would not be portlet_tab1 anymore. It will render with the ctrl00 format.

Something like: #ctl00_ContentPlaceHolderMain_portlet_tab1. You will have to modify name if you use jquery.

You can also do it using jQuery on client side without using the runat-server attribute:

<script type='text/javascript'>

    $("#portlet_tab1").removeClass("Active");

</script>

How to set shape's opacity?

use this code below as progress.xml:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="5dip" />
            <gradient
                    android:startColor="#ff9d9e9d"
                    android:centerColor="#ff5a5d5a"
                    android:centerY="0.75"
                    android:endColor="#ff747674"
                    android:angle="270"
            />
        </shape>
    </item>

    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <solid android:color="#00000000" />
            </shape>
        </clip>
    </item>

    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <solid android:color="#00000000" />
            </shape>
        </clip>
    </item>

</layer-list>

where:

"progress" is current progress before the thumb and "secondaryProgress" is the progress after thumb.
color="#00000000" is a perfect transparency
NOTE: the file above is from default android res and is for 2.3.7, it is available on android sources at: frameworks/base/core/res/res/drawable/progress_horizontal.xml. For newer versions you must find the default drawable file for the seekbar corresponding to your android version.

after that use it in the layout containing the xml:

<SeekBar
    android:id="@+id/myseekbar"
    ...
    android:progressDrawable="@drawable/progress"
    />

you can also customize the thumb by using a custom icon seek_thumb.png:

android:thumb="@drawable/seek_thumb"

Export to csv in jQuery

Here are two WORKAROUNDS to the problem of triggering downloads from the client only. In later browsers you should look at "blob"

1. Drag and drop the table

Did you know you can simply DRAG your table into excel?

Here is how to select the table to either cut and past or drag

Select a complete table with Javascript (to be copied to clipboard)

2. create a popup page from your div

Although it will not produce a save dialog, if the resulting popup is saved with extension .csv, it will be treated correctly by Excel.

The string could be
w.document.write("row1.1\trow1.2\trow1.3\nrow2.1\trow2.2\trow2.3");
e.g. tab-delimited with a linefeed for the lines.

There are plugins that will create the string for you - such as http://plugins.jquery.com/project/table2csv

var w = window.open('','csvWindow'); // popup, may be blocked though
// the following line does not actually do anything interesting with the 
// parameter given in current browsers, but really should have. 
// Maybe in some browser it will. It does not hurt anyway to give the mime type
w.document.open("text/csv");
w.document.write(csvstring); // the csv string from for example a jquery plugin
w.document.close();

DISCLAIMER: These are workarounds, and does not fully answer the question which currently has the answer for most browser: not possible on the client only

Android Layout Animations from bottom to top and top to bottom on ImageView click

I have solved my issue and now my animation works fine :) if anyone needed just copy my code and xml file and have a happy coding :)

My Activity MainActivity:

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class MainActivity extends Activity {

RelativeLayout rl_footer;
ImageView iv_header;
boolean isBottom = true;
Button btn1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    rl_footer = (RelativeLayout) findViewById(R.id.rl_footer);
    iv_header = (ImageView) findViewById(R.id.iv_up_arrow);
    iv_header.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            iv_header.setImageResource(R.drawable.down_arrow);
            iv_header.setPadding(0, 10, 0, 0); 
            rl_footer.setBackgroundResource(R.drawable.up_manu_bar);
            if (isBottom) {
                SlideToAbove();
                isBottom = false;
            } else {
                iv_header.setImageResource(R.drawable.up_arrow);
                iv_header.setPadding(0, 0, 0, 10);
                rl_footer.setBackgroundResource(R.drawable.down_manu_bar1);
                SlideToDown();
                isBottom = true;
            }

        }
    });

}

public void SlideToAbove() {
    Animation slide = null;
    slide = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
            Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
            0.0f, Animation.RELATIVE_TO_SELF, -5.0f);

    slide.setDuration(400);
    slide.setFillAfter(true);
    slide.setFillEnabled(true);
    rl_footer.startAnimation(slide);

    slide.setAnimationListener(new AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {

        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationEnd(Animation animation) {

            rl_footer.clearAnimation();

            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                    rl_footer.getWidth(), rl_footer.getHeight());
            // lp.setMargins(0, 0, 0, 0);
            lp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
            rl_footer.setLayoutParams(lp);

        }

    });

}

public void SlideToDown() {
    Animation slide = null;
    slide = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
            Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
            0.0f, Animation.RELATIVE_TO_SELF, 5.2f);

    slide.setDuration(400);
    slide.setFillAfter(true);
    slide.setFillEnabled(true);
    rl_footer.startAnimation(slide);

    slide.setAnimationListener(new AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {

        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationEnd(Animation animation) {

            rl_footer.clearAnimation();

            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                    rl_footer.getWidth(), rl_footer.getHeight());
            lp.setMargins(0, rl_footer.getWidth(), 0, 0);
            lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
            rl_footer.setLayoutParams(lp);

        }

    });

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

 }

and my Xml activity_main:

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/rl_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@drawable/autograph_bg" >

 <RelativeLayout
    android:id="@+id/rl_footer"
    android:layout_width="fill_parent"
    android:layout_height="70dp"
    android:layout_alignParentBottom="true"
    android:background="@drawable/down_manu_bar1" >

    <ImageView
        android:id="@+id/iv_new_file"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="18dp"
        android:onClick="onNewFileClick"
        android:src="@drawable/file_icon" />

    <TextView
        android:id="@+id/tv_new_file"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/iv_new_file"
        android:layout_below="@+id/iv_new_file"
        android:text="New"
        android:textColor="#ffffff" />

    <ImageView
        android:id="@+id/iv_insert"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignTop="@+id/iv_new_file"
        android:layout_marginLeft="30dp"
        android:layout_toRightOf="@+id/iv_new_file"
        android:src="@drawable/insert_icon" />

    <TextView
        android:id="@+id/tv_insert"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/iv_insert"
        android:layout_below="@+id/iv_insert"
        android:text="Insert"
        android:textColor="#ffffff" />

    <ImageView
        android:id="@+id/iv_up_arrow"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:paddingBottom="10dp"
        android:src="@drawable/up_arrow" />

    <ImageView
        android:id="@+id/iv_down_arrow"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:background="@drawable/down_arrow"
        android:paddingBottom="10dp"
        android:visibility="gone" />

    <ImageView
        android:id="@+id/iv_save"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignTop="@+id/iv_insert"
        android:layout_marginLeft="30dp"
        android:layout_toRightOf="@+id/iv_up_arrow"
        android:src="@drawable/save" />

    <TextView
        android:id="@+id/tv_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/iv_save"
        android:layout_alignParentBottom="true"
        android:text="Save"
        android:textColor="#ffffff" />

    <ImageView
        android:id="@+id/iv_settings"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignTop="@+id/iv_save"
        android:layout_marginLeft="27dp"
        android:layout_toRightOf="@+id/tv_save"
        android:paddingTop="2dp"
        android:src="@drawable/icon_settings" />

    <TextView
        android:id="@+id/tv_settings"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="260dp"
        android:text="Settings"
        android:textColor="#ffffff" />
 </RelativeLayout>

 </RelativeLayout>

just create new android project and copy paste my code and have fun! :) also remember in xml i have image view and his background images replace with yout own images thanks..

ActiveRecord OR query

With rails + arel, a more clear way:

# Table name: messages
#
# sender_id:    integer
# recipient_id: integer
# content:      text

class Message < ActiveRecord::Base
  scope :by_participant, ->(user_id) do
    left  = arel_table[:sender_id].eq(user_id)
    right = arel_table[:recipient_id].eq(user_id)

    where(Arel::Nodes::Or.new(left, right))
  end
end

Produces:

$ Message.by_participant(User.first.id).to_sql 
=> SELECT `messages`.* 
     FROM `messages` 
    WHERE `messages`.`sender_id` = 1 
       OR `messages`.`recipient_id` = 1

Import module from subfolder

Set your PYTHONPATH environment variable. For example like this PYTHONPATH=.:.. (for *nix family).

Also you can manually add your current directory (src in your case) to pythonpath:

import os
import sys
sys.path.insert(0, os.getcwd())

Does bootstrap have builtin padding and margin classes?

For bootstrap 4 we have new classes named with following notation

m - for classes that set margin
p - for classes that set padding

Specify Top, bottom,left, right, left & right, top & bottom using below letters

t - for classes that set margin-top (mt) or padding-top (pt)
b - for classes that set margin-bottom or padding-bottom
l - for classes that set margin-left or padding-left
r - for classes that set margin-right or padding-right
x - for classes that set both *-left and *-right
y - for classes that set both *-top and *-bottom

Specify size using following numbers

0 - for classes that eliminate the margin or padding by setting it to 0
1 - (by default) for classes that set the margin or padding to $spacer * .25
2 - (by default) for classes that set the margin or padding to $spacer * .5
3 - (by default) for classes that set the margin or padding to $spacer
4 - (by default) for classes that set the margin or padding to $spacer * 1.5
5 - (by default) for classes that set the margin or padding to $spacer * 3

Actual Code from bootstrap 4 css file

.mt-0 {
  margin-top: 0 !important;
}

.ml-1 {
  margin-left: ($spacer * .25) !important;
}

.px-2 {
  padding-left: ($spacer * .5) !important;
  padding-right: ($spacer * .5) !important;
}

.p-3 {
  padding: $spacer !important;
}

Usage

So when you need some padding left just add any class from pl-0 to pl-5 based on your need

If you need margin on top just add any class from mt-0 to mt-5 based on your need

<div class="col-sm-6 mt-5"> this div will have margin top added </div>
<div class="col-sm-6 pl-5"> this div will have padding left added </div>

Bootstrap 4 CDN

How do I change the string representation of a Python class?

This is not as easy as it seems, some core library functions don't work when only str is overwritten (checked with Python 2.7), see this thread for examples How to make a class JSON serializable Also, try this

import json

class A(unicode):
    def __str__(self):
        return 'a'
    def __unicode__(self):
        return u'a'
    def __repr__(self):
        return 'a'

a = A()
json.dumps(a)

produces

'""'

and not

'"a"'

as would be expected.

EDIT: answering mchicago's comment:

unicode does not have any attributes -- it is an immutable string, the value of which is hidden and not available from high-level Python code. The json module uses re for generating the string representation which seems to have access to this internal attribute. Here's a simple example to justify this:

b = A('b') print b

produces

'a'

while

json.dumps({'b': b})

produces

{"b": "b"}

so you see that the internal representation is used by some native libraries, probably for performance reasons.

See also this for more details: http://www.laurentluce.com/posts/python-string-objects-implementation/

org.hibernate.hql.internal.ast.QuerySyntaxException: table is not mapped

I too have faced similar issue when i started to work on Hibernate. All in all i can say is in the createQuery one needs to pass the name of the entity class not the table name to which the entity is mapped to.

How to use pip with Python 3.x alongside Python 2.x

Please note that on msys2 I've found these commands to be helpful:

$ pacman -S python3-pip
$ pip3 install --upgrade pip
$ pip3 install --user package_name

How do you rebase the current branch's changes on top of changes being merged in?

Another way to look at it is to consider git rebase master as:

Rebase the current branch on top of master

Here , 'master' is the upstream branch, and that explain why, during a rebase, ours and theirs are reversed.

No module named 'pymysql'

Sort of already answered this in the comments, but just so this question has an answer, the problem was resolved through running:

sudo apt-get install python3-pymysql

Check if directory mounted with bash

Getting list of tables, and fields in each, in a database

in a Microsoft SQL Server you can use this:

declare @sql2 nvarchar(2000)
        set @sql2  ='
use ?
if (  db_name(db_id()) not in (''master'',''tempdb'',''model'',''msdb'',''SSISDB'')  )
begin   

select
    db_name() as db,
    SS.name as schemaname,
    SO.name tablename,
    SC.name columnname,
    ST.name type,
    case when ST.name in (''nvarchar'', ''nchar'')
        then convert(varchar(10), ( SC.max_length / 2 ))
        when ST.name in (''char'', ''varchar'')
        then convert(varchar(10), SC.max_length)
        else null
    end as length,
    case when SC.is_nullable = 0 then ''No'' when SC.is_nullable = 1 then ''Yes'' else null end as nullable,
    isnull(SC.column_id,0) as col_number
from sys.objects                  SO
join sys.schemas                  SS
    on SS.schema_id = SO.schema_id
join sys.columns             SC
on SO.object_id     = SC.object_id
left join sys.types               ST
    on SC.user_type_id = ST.user_type_id and SC.system_type_id = ST.system_type_id
    where SO.is_ms_shipped = 0 
end
'

exec sp_msforeachdb @command1 = @sql2

this shows you all tables and columns ( and their definition ) from all userdefined databases.

How do I shrink my SQL Server Database?

Here's another solution: Use the Database Publishing Wizard to export your schema, security and data to sql scripts. You can then take your current DB offline and re-create it with the scripts.

Sounds kind of foolish, but there are a couple advantages. First, there's no chance of losing data. Your original db (as long as you don't delete your DB when dropping it!) is safe, the new DB will be roughly as small as it can be, and you'll have two different snapshots of your current database - one ready to roll, one minified - you can choose from to back up.

CSS Margin: 0 is not setting to 0

I just started learning CSS today and encountered the same problem and I think You don't need to reset style of all HTML tags. You need to reset default margin of top HTML You used, which is paragraph tag. And I know this is old question, but maybe my solution below will help somebody.

Try this:

body{   
    margin: 0; 
    background:#F0F0F0;
}
p{
    margin: 0;
}

Rmi connection refused with localhost

One difference we can note in Windows is:

If you use Runtime.getRuntime().exec("rmiregistry 1024");

you can see rmiregistry.exe process will run in your Task Manager

whereas if you use Registry registry = LocateRegistry.createRegistry(1024);

you can not see the process running in Task Manager,

I think Java handles it in a different way.

and this is my server.policy file

Before running the the application, make sure that you killed all your existing javaw.exe and rmiregistry.exe corresponds to your rmi programs which are already running.

The following code works for me by using Registry.LocateRegistry() or

Runtime.getRuntime.exec("");


// Standard extensions get all permissions by default

grant {
    permission java.security.AllPermission;
};

VM argument

-Djava.rmi.server.codebase=file:\C:\Users\Durai\workspace\RMI2\src\

Code:

package server;    

import java.rmi.Naming;
import java.rmi.RMISecurityManager;
import java.rmi.Remote;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class HelloServer 
{
  public static void main (String[] argv) 
  {
    try {

        if(System.getSecurityManager()==null){
            System.setProperty("java.security.policy","C:\\Users\\Durai\\workspace\\RMI\\src\\server\\server.policy");
            System.setSecurityManager(new RMISecurityManager());
        }

 Runtime.getRuntime().exec("rmiregistry 1024");

 //     Registry registry = LocateRegistry.createRegistry(1024);
   //   registry.rebind ("Hello", new Hello ("Hello,From Roseindia.net pvt ltd!"));
   //Process process = Runtime.getRuntime().exec("C:\\Users\\Durai\\workspace\\RMI\\src\\server\\rmi_registry_start.bat");

        Naming.rebind ("//localhost:1024/Hello",new Hello ("Hello,From Roseindia.net pvt ltd!")); 
      System.out.println ("Server is connected and ready for operation.");
    } 
    catch (Exception e) {
      System.out.println ("Server not connected: " + e);
      e.printStackTrace();
    }
  }
}

How to compile Tensorflow with SSE4.2 and AVX instructions?

These are SIMD vector processing instruction sets.

Using vector instructions is faster for many tasks; machine learning is such a task.

Quoting the tensorflow installation docs:

To be compatible with as wide a range of machines as possible, TensorFlow defaults to only using SSE4.1 SIMD instructions on x86 machines. Most modern PCs and Macs support more advanced instructions, so if you're building a binary that you'll only be running on your own machine, you can enable these by using --copt=-march=native in your bazel build command.

PHP Excel Header

Try this

header("Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
header("Content-Disposition: attachment;filename=\"filename.xlsx\"");
header("Cache-Control: max-age=0");

Where are logs located?

Ensure debug mode is on - either add APP_DEBUG=true to .env file or set an environment variable
Log files are in storage/logs folder. laravel.log is the default filename. If there is a permission issue with the log folder, Laravel just halts. So if your endpoint generally works - permissions are not an issue.
In case your calls don't even reach Laravel or aren't caused by code issues - check web server's log files (check your Apache/nginx config files to see the paths).
If you use PHP-FPM, check its log files as well (you can see the path to log file in PHP-FPM pool config).

Support for ES6 in Internet Explorer 11

The statement from Microsoft regarding the end of Internet Explorer 11 support mentions that it will continue to receive security updates, compatibility fixes, and technical support until its end of life. The wording of this statement leads me to believe that Microsoft has no plans to continue adding features to Internet Explorer 11, and instead will be focusing on Edge.

If you require ES6 features in Internet Explorer 11, check out a transpiler such as Babel.

jQuery counter to count up to a target number

Try jCounter, it has a customRange setting where you can specify the start and end number, it can count up as well including the fallback you want at the end.

Check if a string contains numbers and letters

Converting String Array to an Integer Array

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class MultiArg {

    Scanner sc;
    int n;
    String as;
    List<Integer> numList = new ArrayList<Integer>();

    public void fun() {
        sc = new Scanner(System.in);
        System.out.println("enter value");
        while (sc.hasNextInt())
            as = sc.nextLine();
    }

    public void diplay() {
        System.out.println("x");
        Integer[] num = numList.toArray(new Integer[numList.size()]);
        System.out.println("show value " + as);
        for (Integer m : num) {
            System.out.println("\t" + m);
        }
    }
}

but to terminate the while loop you have to put any charecter at the end of input.

ex. input:

12 34 56 78 45 67 .

output:

12 34 56 78 45 67

What is the point of the diamond operator (<>) in Java 7?

In theory, the diamond operator allows you to write more compact (and readable) code by saving repeated type arguments. In practice, it's just two confusing chars more giving you nothing. Why?

No sane programmer uses raw types in new code. So the compiler could simply assume that by writing no type arguments you want it to infer them.
The diamond operator provides no type information, it just says the compiler, "it'll be fine". So by omitting it you can do no harm. At any place where the diamond operator is legal it could be "inferred" by the compiler.

IMHO, having a clear and simple way to mark a source as Java 7 would be more useful than inventing such strange things. In so marked code raw types could be forbidden without losing anything.

Btw., I don't think that it should be done using a compile switch. The Java version of a program file is an attribute of the file, no option at all. Using something as trivial as

package 7 com.example;

could make it clear (you may prefer something more sophisticated including one or more fancy keywords). It would even allow to compile sources written for different Java versions together without any problems. It would allow introducing new keywords (e.g., "module") or dropping some obsolete features (multiple non-public non-nested classes in a single file or whatsoever) without losing any compatibility.

Which is better: <script type="text/javascript">...</script> or <script>...</script>

<script type="text/javascript"></script> because its the right way and compatible with all browsers

How to make inline plots in Jupyter Notebook larger?

Yes, play with figuresize and dpi like so (before you call your subplot):

fig=plt.figure(figsize=(12,8), dpi= 100, facecolor='w', edgecolor='k')

As @tacaswell and @Hagne pointed out, you can also change the defaults if it's not a one-off:

plt.rcParams['figure.figsize'] = [12, 8]
plt.rcParams['figure.dpi'] = 100 # 200 e.g. is really fine, but slower

Remove last 3 characters of string or number in javascript

you just need to divide the Date Time stamp by 1000 like:

var a = 1437203995000;
a = (a)/1000;

UNIX export command

When you execute a program the child program inherits its environment variables from the parent. For instance if $HOME is set to /root in the parent then the child's $HOME variable is also set to /root.

This only applies to environment variable that are marked for export. If you set a variable at the command-line like

$ FOO="bar"

That variable will not be visible in child processes. Not unless you export it:

$ export FOO

You can combine these two statements into a single one in bash (but not in old-school sh):

$ export FOO="bar"

Here's a quick example showing the difference between exported and non-exported variables. To understand what's happening know that sh -c creates a child shell process which inherits the parent shell's environment.

$ FOO=bar
$ sh -c 'echo $FOO'

$ export FOO
$ sh -c 'echo $FOO'
bar

Note: To get help on shell built-in commands use help export. Shell built-ins are commands that are part of your shell rather than independent executables like /bin/ls.

How to decode a Base64 string?

Isn't encoding taking the text TO base64 and decoding taking base64 BACK to text? You seem be mixing them up here. When I decode using this online decoder I get:

BASE64: blahblah
UTF8: nVnV

not the other way around. I can't reproduce it completely in PS though. See sample below:

PS > [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("blahblah"))
nV?nV?

PS > [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes("nVnV"))
blZuVg==

EDIT I believe you're using the wrong encoder for your text. The encoded base64 string is encoded from UTF8(or ASCII) string.

PS > [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
blahblah

PS > [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
????

PS > [System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
blahblah

How can I clear the input text after clicking

Using jQuery ...

$('#submitButtonsId').click(
    function(){
        $(#myTextInput).val('');
    });

Using pure Javascript ...

var btn = document.getElementById('submitButton');
btn.onclick = function(){ document.getElementById('myTextInput').value="" };

HTML5 Number Input - Always show 2 decimal places

Take a look at this:

 <input type="number" step="0.01" />

Passing data between a fragment and its container activity

EntityType has no key defined error

The object must contain a field which will be used as the Primary Key, if you have a field named Id then this will by default be the primary key of the object to which Entity Framework will link to.

Otherwise, you should add the [Key] attribute above that field you wanna use as the Primary Key, and you'll also need to add the namespace System.ComponentModel.DataAnnotations:

public class myClass
{
    public int Id { get; set; }
    [Key]
    public string Name { get; set; }
}

https://stackoverflow.com/a/51180941/7003760

Change the background color of CardView programmatically

I finally got the corners to stay. This is c#, Xamarin.Android

in ViewHolder:

CardView = itemView.FindViewById<CardView>(Resource.Id.cdvTaskList);

In Adapter:

vh.CardView.SetCardBackgroundColor(Color.ParseColor("#4dd0e1"));

How to search if dictionary value contains certain string with Python

import json 'mtach' in json.dumps(myDict) is true if found

What is the difference between g++ and gcc?

Although the gcc and g++ commands do very similar things, g++ is designed to be the command you'd invoke to compile a C++ program; it's intended to automatically do the right thing.

Behind the scenes, they're really the same program. As I understand, both decide whether to compile a program as C or as C++ based on the filename extension. Both are capable of linking against the C++ standard library, but only g++ does this by default. So if you have a program written in C++ that doesn't happen to need to link against the standard library, gcc will happen to do the right thing; but then, so would g++. So there's really no reason not to use g++ for general C++ development.

What is the difference between spark.sql.shuffle.partitions and spark.default.parallelism?

spark.default.parallelism is the default number of partition set by spark which is by default 200. and if you want to increase the number of partition than you can apply the property spark.sql.shuffle.partitions to set number of partition in the spark configuration or while running spark SQL.

Normally this spark.sql.shuffle.partitions it is being used when we have a memory congestion and we see below error: spark error:java.lang.IllegalArgumentException: Size exceeds Integer.MAX_VALUE

so set your can allocate a partition as 256 MB per partition and that you can use to set for your processes.

also If number of partitions is near to 2000 then increase it to more than 2000. As spark applies different logic for partition < 2000 and > 2000 which will increase your code performance by decreasing the memory footprint as data default is highly compressed if >2000.

Converting ISO 8601-compliant String to java.util.Date

Also you can use the following class -

org.springframework.extensions.surf.util.ISO8601DateFormat


Date date = ISO8601DateFormat.parse("date in iso8601");

Link to the Java Doc - Hierarchy For Package org.springframework.extensions.surf.maven.plugin.util

PopupWindow $BadTokenException: Unable to add window -- token null is not valid

use this method before show

public static ViewGroup getActivityFirstLayout(Context ctx)
{
    return (ViewGroup)((ViewGroup) ActivityMaster.getActivity(ctx).findViewById(android.R.id.content)).getChildAt(0);
}

private boolean activityIsOk(Activity activity)
{
    boolean s1 = !(activity == null || activity.isFinishing());

    if(s1)
    {
        View v = LayoutMaster.getActivityFirstLayout(activity);
        return v.isShown() && ViewCompat.isLaidOut(v);
    }

    return false;
}

Adding horizontal spacing between divs in Bootstrap 3

The best solution is not to use the same element for column and panel:

<div class="row">
    <div class="col-md-3">
        <div class="panel" id="gameplay-away-team">Away Team</div>
    </div>
    <div class="col-md-6">
        <div class="panel" id="gameplay-baseball-field">Baseball Field</div>
    </div>
    <div class="col-md-3">
        <div class="panel" id="gameplay-home-team">Home Team</div>
    </div>
</div>

and some more styles:

#gameplay-baseball-field {
  padding-right: 10px;
  padding-left: 10px;
}

Simple way to count character occurrences in a string

Something a bit more functional, without Regex:

public static int count(String s, char c) {
    return s.length()==0 ? 0 : (s.charAt(0)==c ? 1 : 0) + count(s.substring(1),c);
}

It's no tail recursive, for the sake of clarity.

Error "The goal you specified requires a project to execute but there is no POM in this directory" after executing maven command

Check for the name of the file, i.e pom.xml file is spelled correctly with proper file extension .xml.

Example for this error are

pom.ml pm.xl

Bootstrap Dropdown with Hover

Updated with a proper plugin

I have published a proper plugin for the dropdown hover functionality, in which you can even define what happens when clicking on the dropdown-toggle element:

https://github.com/istvan-ujjmeszaros/bootstrap-dropdown-hover

Why I made it, when there are many solutions already?

I had issues with all the previously existing solutions. The simple CSS ones are not using the .open class on the .dropdown, so there will be no feedback on the dropdown toggle element when the dropdown is visible.

The js ones are interfering with clicking on .dropdown-toggle, so the dropdown shows up on hover, then hides it when clicking on an opened dropdown, and moving out the mouse will trigger the dropdown to show up again. Some of the js solutions are braking iOS compatibility, some plugins are not working on modern desktop browsers which are supporting the touch events.

That's why I made the Bootstrap Dropdown Hover plugin which prevents all these issues by using only the standard Bootstrap javascript API, without any hack.

What is the best way to filter a Java Collection?

My answer builds on that from Kevin Wong, here as a one-liner using CollectionUtils from spring and a Java 8 lambda expression.

CollectionUtils.filter(list, p -> ((Person) p).getAge() > 16);

This is as concise and readable as any alternative I have seen (without using aspect-based libraries)

Spring CollectionUtils is available from spring version 4.0.2.RELEASE, and remember you need JDK 1.8 and language level 8+.

Iterating through directories with Python

From python >= 3.5 onward, you can use **, glob.iglob(path/**, recursive=True) and it seems the most pythonic solution, i.e.:

import glob, os

for filename in glob.iglob('/pardadox-music/**', recursive=True):
    if os.path.isfile(filename): # filter dirs
        print(filename)

Output:

/pardadox-music/modules/her1.mod
/pardadox-music/modules/her2.mod
...

Notes:
1 - glob.iglob

glob.iglob(pathname, recursive=False)

Return an iterator which yields the same values as glob() without actually storing them all simultaneously.

2 - If recursive is True, the pattern '**' will match any files and zero or more directories and subdirectories.

3 - If the directory contains files starting with . they won’t be matched by default. For example, consider a directory containing card.gif and .card.gif:

>>> import glob
>>> glob.glob('*.gif') ['card.gif'] 
>>> glob.glob('.c*')['.card.gif']

4 - You can also use rglob(pattern), which is the same as calling glob() with **/ added in front of the given relative pattern.

Is there more to an interface than having the correct methods

I think you understand everything Interfaces do, but you're not yet imagining the situations in which an Interface is useful.

If you're instantiating, using and releasing an object all within a narrow scope (for example, within one method call), an Interface doesn't really add anything. Like you noted, the concrete class is known.

Where Interfaces are useful is when an object needs to be created one place and returned to a caller that may not care about the implementation details. Let's change your IBox example to an Shape. Now we can have implementations of Shape such as Rectangle, Circle, Triangle, etc., The implementations of the getArea() and getSize() methods will be completely different for each concrete class.

Now you can use a factory with a variety of createShape(params) methods which will return an appropriate Shape depending on the params passed in. Obviously, the factory will know about what type of Shape is being created, but the caller won't have to care about whether it's a circle, or a square, or so on.

Now, imagine you have a variety of operations you have to perform on your shapes. Maybe you need to sort them by area, set them all to a new size, and then display them in a UI. The Shapes are all created by the factory and then can be passed to the Sorter, Sizer and Display classes very easily. If you need to add a hexagon class some time in the future, you don't have to change anything but the factory. Without the Interface, adding another shape becomes a very messy process.

Programs & Examples On #Aliases

Typescript: TS7006: Parameter 'xxx' implicitly has an 'any' type

Minimal error reproduction

Recommended solution: --resolveJsonModule

Option 1: Explicit user type (simple, no checks)

Option 2: Type guards (middleground)

Option 3: Runtime type system library (sophisticated)

Not recommended solutions

TypeError: int() argument must be a string, a bytes-like object or a number, not 'list'

How to set aliases in the Git Bash for Windows?

Switch between python 2.7 and python 3.5 on Mac OS X

Change the location of the ~ directory in a Windows install of Git Bash

A better way to check if a path exists or not in PowerShell

how to rename an index in a cluster?

How to create permanent PowerShell Aliases

How to remove a package from Laravel using composer?

Vagrant error : Failed to mount folders in Linux guest

Aliases in Windows command prompt

Is there a difference between PhoneGap and Cordova commands?

How to alias a table in Laravel Eloquent queries (or using Query Builder)?

how to pass variable from shell script to sqlplus

Dealing with "Xerces hell" in Java/Maven?

Error message "Forbidden You don't have permission to access / on this server"

Best way to get child nodes

How do I use Apache tomcat 7 built in Host Manager gui?

How do I run a shell script without using "sh" or "bash" commands?

Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?

phpMyAdmin + CentOS 6.0 - Forbidden

List Git aliases

Git for Windows: .bashrc or equivalent configuration files for Git Bash shell

InvalidKeyException : Illegal Key Size - Java code throwing exception for encryption class - how to fix?

What's the purpose of SQL keyword "AS"?

Getting list of Facebook friends with latest API

In Bash, how to add "Are you sure [Y/n]" to any command or alias?

no such file to load -- rubygems (LoadError)

Define an alias in fish shell

What exactly is "exit" in PowerShell?

MSBuild doesn't copy references (DLL files) if using project dependencies in solution

Meaning of tilde in Linux bash (not home directory)

Linux command to list all available commands and aliases

How to pass command line arguments to a shell alias?

About .bash_profile, .bashrc, and where should alias be written in?

What's the difference between .bashrc, .bash_profile, and .environment?

Parsing JSON using Json.net

How to detect the OS from a Bash script?

Best way to compare 2 XML documents in Java

How to return multiple values in one column (T-SQL)?

Virtual network interface in Mac OS X

Best way to convert text files between character sets?

Hidden Features of C#?

how to make div click-able?

break statement in "if else" - java

How do I change the data type for a column in MySQL?

Create a simple HTTP server with Java?

Check if item is in an array / list

Prevent direct access to a php include file

Calling class staticmethod within the class body?

How to require a controller in an angularjs directive

How do I get the currently displayed fragment?

SQL update fields of one table from fields of another one

data.frame Group By column

Can I force a UITableView to hide the separator between empty cells?

How to pick an image from gallery (SD Card) for my app?

How to sort a collection by date in MongoDB?

How do I print a datetime in the local timezone?

How can I start an Activity from a non-Activity class?

codeigniter model error: Undefined property

How to find tag with particular text with Beautiful Soup?

How do I import a specific version of a package using go get?

How do I get the IP address into a batch-file variable?

Standardize data columns in R

Specified cast is not valid.. how to resolve this

javax.xml.bind.JAXBException: Class *** nor any of its super class is known to this context

Java Singleton and Synchronization

LEFT function in Oracle

grep regex whitespace behavior

How to add option to select list in jQuery

How to give Jenkins more heap space when it´s started as a service under Windows?

Getting Error 800a0e7a "Provider cannot be found. It may not be properly installed."

Python "SyntaxError: Non-ASCII character '\xe2' in file"

Recommended solution: `--resolveJsonModule`