Where is the itoa function in Linux?

glibc internal implementation

glibc 2.28 has an internal implementation:

which is used in several places internally, but I could not find if it can be exposed or how.

At least that should be a robust implementation if you are willing to extract it.

This question asks how to roll your own: How to convert an int to string in C?

How to get element by innerText

You could use xpath to accomplish this

var xpath = "//a[text()='SearchingText']";
var matchingElement = document.evaluate(xpath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;

You can also search of an element containing some text using this xpath:

var xpath = "//a[contains(text(),'Searching')]";

Using routes in Express-js

You could also organise them into modules. So it would be something like.

./
controllers
    index.js
    indexController.js
app.js

and then in the indexController.js of the controllers export your controllers.

//indexController.js
module.exports = function(){
//do some set up

var self = {
     indexAction : function (req,res){
       //do your thing
}
return self;
};

then in index.js of controllers dir

exports.indexController = require("./indexController");

and finally in app.js

var controllers = require("./controllers");

app.get("/",controllers.indexController().indexAction);

I think this approach allows for clearer seperation and also you can configure your controllers by passing perhaps a db connection in.

What is a simple command line program or script to backup SQL server databases?

I'm using tsql on a Linux/UNIX infrastructure to access MSSQL databases. Here's a simple shell script to dump a table to a file:

#!/usr/bin/ksh
#
#.....
(
tsql -S {database} -U {user} -P {password} <<EOF
select * from {table}
go
quit
EOF
) >{output_file.dump}

Is it still valid to use IE=edge,chrome=1?

<head>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>

worked for me, to force IE to "snap out of compatibility mode" (so to speak), BUT that meta statement must appear IMMEDIATELY after the <head>, or it won't work!

How to handle an IF STATEMENT in a Mustache template?

In general, you use the # syntax:

{{#a_boolean}}
  I only show up if the boolean was true.
{{/a_boolean}}

The goal is to move as much logic as possible out of the template (which makes sense).

How to import multiple csv files in a single load?

Note that you can use other tricks like :

-- One or more wildcard:
       .../Downloads20*/*.csv
--  braces and brackets   
       .../Downloads201[1-5]/book.csv
       .../Downloads201{11,15,19,99}/book.csv

How to mention C:\Program Files in batchfile

I use in my batch files - c:\progra~2\ instead of C:\Program Files (x86)\ and it works.

How to display Toast in Android?

Simplest way! (To Display In Your Main Activity, replace First Argument for other activity)

Button.setOnClickListener(new View.OnClickListener(){
    @Override
    public void onClick(View v){
        Toast.makeText(MainActivity.this,"Toast Message",Toast.LENGTH_SHORT).show();
    }
}

AngularJs .$setPristine to reset form

Just for those who want to get $setPristine without having to upgrade to v1.1.x, here is the function I used to simulate the $setPristine function. I was reluctant to use the v1.1.5 because one of the AngularUI components I used is no compatible.

var setPristine = function(form) {
    if (form.$setPristine) {//only supported from v1.1.x
        form.$setPristine();
    } else {
        /*
         *Underscore looping form properties, you can use for loop too like:
         *for(var i in form){ 
         *  var input = form[i]; ...
         */
        _.each(form, function (input) {
            if (input.$dirty) {
                input.$dirty = false;
            }
        });
    }
};

Note that it ONLY makes $dirty fields clean and help changing the 'show error' condition like $scope.myForm.myField.$dirty && $scope.myForm.myField.$invalid.

Other parts of the form object (like the css classes) still need to consider, but this solve my problem: hide error messages.

Count the number occurrences of a character in a string

I know the ask is to count a particular letter. I am writing here generic code without using any method.

sentence1 =" Mary had a little lamb"
count = {}
for i in sentence1:
    if i in count:
        count[i.lower()] = count[i.lower()] + 1
    else:
        count[i.lower()] = 1
print(count)

output

{' ': 5, 'm': 2, 'a': 4, 'r': 1, 'y': 1, 'h': 1, 'd': 1, 'l': 3, 'i': 1, 't': 2, 'e': 1, 'b': 1}

Now if you want any particular letter frequency, you can print like below.

print(count['m'])
2

How to compare two JSON have the same properties without order?

lodash will work, tested even for angular 5, http://jsfiddle.net/L5qrfx3x/

var remoteJSON = {"allowExternalMembers": "false", "whoCanJoin": 
   "CAN_REQUEST_TO_JOIN"};
var localJSON = {"whoCanJoin": "CAN_REQUEST_TO_JOIN", 
  "allowExternalMembers": "false"};

 if(_.isEqual(remoteJSON, localJSON)){
     //TODO
    }

it works, for installation in angular, follow this

Uninstalling Android ADT

i got the same problem after clicking update plugins, i tried all the suggestions above and failed , the only thing that worked for my is reinstalling android studio..

Selecting data from two different servers in SQL Server

Simplified solution for adding linked servers

First server

EXEC sp_addlinkedserver @server='ip,port\instancename'

Second Login

EXEC sp_addlinkedsrvlogin 'ip,port\instancename', 'false', NULL, 'remote_db_loginname', 'remote_db_pass'

Execute queries from linked to local db

INSERT INTO Tbl (Col1, Col2, Col3)
SELECT Col1, Col2, Col3
FROM [ip,port\instancename].[linkedDBName].[linkedTblSchema].[linkedTblName]

How to create cron job using PHP?

There is a simple way to solve this: you can execute php file by cron every 1 minute, and inside php executable file make "if" statement to execute when time "now" like this

<?/** suppose we have 1 hour and 1 minute inteval 01:01 */

$interval_source = "01:01";
$time_now = strtotime( "now" ) / 60;
$interval = substr($interval_source,0,2) * 60 + substr($interval_source,3,2);


if( $time_now % $interval == 0){
/** do cronjob */
}

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

A common gotcha for directories hosted outside of the default /var/www/ is that the Apache user doesn't just need permissions to the directory and subdirectories where the site is being hosted. Apache requires permissions to all the directories all the way up to the root of the file system where the site is hosted. Apache automatically gets permissions assigned to /var/www/ when it's installed, so if your host directory is directly underneath that then this doesn't apply to you. Edit: Daybreaker has reported that his Apache was installed without correct access permissions to the default directory.

For example, you've got a development machine and your site's directory is:

/username/home/Dropbox/myamazingsite/

You may think you can get away with:

chgrp -R www-data /username/home/Dropbox/myamazingsite/
chmod -R 2750 /username/home/Dropbox/myamazingsite/

because this gives Apache permissions to access your site's directory? Well that's correct but it's not sufficient. Apache requires permissions all the way up the directory tree so what you need to do is:

chgrp -R www-data /username/
chmod -R 2750 /username/

Obviously I would not recommend giving access to Apache on a production server to a complete directory structure without analysing what's in that directory structure. For production it's best to keep to the default directory or another directory structure that's just for holding web assets.

Edit2: as u/chimeraha pointed out, if you're not sure what you're doing with the permissions, it'd be best to move your site's directory out of your home directory to avoid potentially locking yourself out of your home directory.

How to group pandas DataFrame entries by date in a non-unique column

I'm using pandas 0.16.2. This has better performance on my large dataset:

data.groupby(data.date.dt.year)

Using the dt option and playing around with weekofyear, dayofweek etc. becomes far easier.

Mockito - NullpointerException when stubbing Method

you need to initialize MockitoAnnotations.initMocks(this) method has to called to initialize annotated fields.

   @Before public void initMocks() {
       MockitoAnnotations.initMocks(this);
   }

for more details see Doc

How do we change the URL of a working GitLab install?

GitLab Omnibus

For an Omnibus install, it is a little different.

The correct place in an Omnibus install is:

/etc/gitlab/gitlab.rb
    external_url 'http://gitlab.example.com'

Finally, you'll need to execute sudo gitlab-ctl reconfigure and sudo gitlab-ctl restart so the changes apply.

I was making changes in the wrong places and they were getting blown away.

The incorrect paths are:

/opt/gitlab/embedded/service/gitlab-rails/config/gitlab.yml
/var/opt/gitlab/.gitconfig
/var/opt/gitlab/nginx/conf/gitlab-http.conf

Pay attention to those warnings that read:

# This file is managed by gitlab-ctl. Manual changes will be
# erased! To change the contents below, edit /etc/gitlab/gitlab.rb
# and run `sudo gitlab-ctl reconfigure`.

Calculating and printing the nth prime number

java.math.BigInteger has a nextProbablePrime() method. Whilst I'm guessing this is meant for cryptography you could use it for you work.

BigInteger prime = BigInteger.valueOf(0);
for (int i = 0; i < n; i++) {
    prime = prime.nextProbablePrime();
}
System.out.println(prime.intValue());

Starting ssh-agent on Windows 10 fails: "unable to start ssh-agent service, error :1058"

I solved the problem by changing the StartupType of the ssh-agent to Manual via Set-Service ssh-agent -StartupType Manual.

Then I was able to start the service via Start-Service ssh-agent or just ssh-agent.exe.

No increment operator (++) in Ruby?

From a posting by Matz:

(1) ++ and -- are NOT reserved operator in Ruby.

(2) C's increment/decrement operators are in fact hidden assignment. They affect variables, not objects. You cannot accomplish assignment via method. Ruby uses +=/-= operator instead.

(3) self cannot be a target of assignment. In addition, altering the value of integer 1 might cause severe confusion throughout the program.
                      matz.

How to show the Project Explorer window in Eclipse

i had also encountered this issue. . This Solution worked for me....

windows->navigation->maximize active View or Editor(ctrl + M) . in the screen you can see on left side navigation menus ... now click on those buttons one by one ....you will get your solution...

How to remove default chrome style for select Input?

Are you talking about when you click on an input box, rather than just hover over it? This fixed it for me:

input:focus {
   outline: none;
   border: specify yours;
}

Get a DataTable Columns DataType

You can get column type of DataTable with DataType attribute of datatable column like below:

var type = dt.Columns[0].DataType

dt : DataTable object.

0 : DataTable column index.

Hope It Helps

Ty :)

What are Runtime.getRuntime().totalMemory() and freeMemory()?

Codified version of all other answers (at the time of writing):

import java.io.*;

/**
 * This class is based on <a href="http://stackoverflow.com/users/2478930/cheneym">cheneym</a>'s
 * <a href="http://stackoverflow.com/a/18375641/253468">awesome interpretation</a>
 * of the Java {@link Runtime}'s memory query methods, which reflects intuitive thinking.
 * Also includes comments and observations from others on the same question, and my own experience.
 * <p>
 * <img src="https://i.stack.imgur.com/GjuwM.png" alt="Runtime's memory interpretation">
 * <p>
 * <b>JVM memory management crash course</b>:
 * Java virtual machine process' heap size is bounded by the maximum memory allowed.
 * The startup and maximum size can be configured by JVM arguments.
 * JVMs don't allocate the maximum memory on startup as the program running may never require that.
 * This is to be a good player and not waste system resources unnecessarily.
 * Instead they allocate some memory and then grow when new allocations require it.
 * The garbage collector will be run at times to clean up unused objects to prevent this growing.
 * Many parameters of this management such as when to grow/shrink or which GC to use
 * can be tuned via advanced configuration parameters on JVM startup.
 *
 * @see <a href="http://stackoverflow.com/a/42567450/253468">
 *     What are Runtime.getRuntime().totalMemory() and freeMemory()?</a>
 * @see <a href="http://www.oracle.com/technetwork/java/javase/memorymanagement-whitepaper-150215.pdf">
 *     Memory Management in the Sun Java HotSpot™ Virtual Machine</a>
 * @see <a href="http://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html">
 *     Full VM options reference for Windows</a>
 * @see <a href="http://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html">
 *     Full VM options reference for Linux, Mac OS X and Solaris</a>
 * @see <a href="http://www.oracle.com/technetwork/articles/java/vmoptions-jsp-140102.html">
 *     Java HotSpot VM Options quick reference</a>
 */
public class SystemMemory {

    // can be white-box mocked for testing
    private final Runtime runtime = Runtime.getRuntime();

    /**
     * <b>Total allocated memory</b>: space currently reserved for the JVM heap within the process.
     * <p>
     * <i>Caution</i>: this is not the total memory, the JVM may grow the heap for new allocations.
     */
    public long getAllocatedTotal() {
        return runtime.totalMemory();
    }

    /**
     * <b>Current allocated free memory</b>: space immediately ready for new objects.
     * <p>
     * <i>Caution</i>: this is not the total free available memory,
     * the JVM may grow the heap for new allocations.
     */
    public long getAllocatedFree() {
        return runtime.freeMemory();
    }

    /**
     * <b>Used memory</b>:
     * Java heap currently used by instantiated objects. 
     * <p>
     * <i>Caution</i>: May include no longer referenced objects, soft references, etc.
     * that will be swept away by the next garbage collection.
     */
    public long getUsed() {
        return getAllocatedTotal() - getAllocatedFree();
    }

    /**
     * <b>Maximum allocation</b>: the process' allocated memory will not grow any further.
     * <p>
     * <i>Caution</i>: This may change over time, do not cache it!
     * There are some JVMs / garbage collectors that can shrink the allocated process memory.
     * <p>
     * <i>Caution</i>: If this is true, the JVM will likely run GC more often.
     */
    public boolean isAtMaximumAllocation() {
        return getAllocatedTotal() == getTotal();
        // = return getUnallocated() == 0;
    }

    /**
     * <b>Unallocated memory</b>: amount of space the process' heap can grow.
     */
    public long getUnallocated() {
        return getTotal() - getAllocatedTotal();
    }

    /**
     * <b>Total designated memory</b>: this will equal the configured {@code -Xmx} value.
     * <p>
     * <i>Caution</i>: You can never allocate more memory than this, unless you use native code.
     */
    public long getTotal() {
        return runtime.maxMemory();
    }

    /**
     * <b>Total free memory</b>: memory available for new Objects,
     * even at the cost of growing the allocated memory of the process.
     */
    public long getFree() {
        return getTotal() - getUsed();
        // = return getAllocatedFree() + getUnallocated();
    }

    /**
     * <b>Unbounded memory</b>: there is no inherent limit on free memory.
     */
    public boolean isBounded() {
        return getTotal() != Long.MAX_VALUE;
    }

    /**
     * Dump of the current state for debugging or understanding the memory divisions.
     * <p>
     * <i>Caution</i>: Numbers may not match up exactly as state may change during the call.
     */
    public String getCurrentStats() {
        StringWriter backing = new StringWriter();
        PrintWriter out = new PrintWriter(backing, false);
        out.printf("Total: allocated %,d (%.1f%%) out of possible %,d; %s, %s %,d%n",
                getAllocatedTotal(),
                (float)getAllocatedTotal() / (float)getTotal() * 100,
                getTotal(),
                isBounded()? "bounded" : "unbounded",
                isAtMaximumAllocation()? "maxed out" : "can grow",
                getUnallocated()
        );
        out.printf("Used: %,d; %.1f%% of total (%,d); %.1f%% of allocated (%,d)%n",
                getUsed(),
                (float)getUsed() / (float)getTotal() * 100,
                getTotal(),
                (float)getUsed() / (float)getAllocatedTotal() * 100,
                getAllocatedTotal()
        );
        out.printf("Free: %,d (%.1f%%) out of %,d total; %,d (%.1f%%) out of %,d allocated%n",
                getFree(),
                (float)getFree() / (float)getTotal() * 100,
                getTotal(),
                getAllocatedFree(),
                (float)getAllocatedFree() / (float)getAllocatedTotal() * 100,
                getAllocatedTotal()
        );
        out.flush();
        return backing.toString();
    }

    public static void main(String... args) {
        SystemMemory memory = new SystemMemory();
        System.out.println(memory.getCurrentStats());
    }
}

Serialize Class containing Dictionary member

You should explore Json.Net, quite easy to use and allows Json objects to be deserialized in Dictionary directly.

james_newtonking

example:

string json = @"{""key1"":""value1"",""key2"":""value2""}";
Dictionary<string, string> values = JsonConvert.DeserializeObject<Dictionary<string, string>>(json); 
Console.WriteLine(values.Count);
// 2
Console.WriteLine(values["key1"]);
// value1

Run bash command on jenkins pipeline

For multi-line shell scripts or those run multiple times, I would create a new bash script file (starting from #!/bin/bash), and simply run it with sh from Jenkinsfile:

sh 'chmod +x ./script.sh'
sh './script.sh'

Increment a Integer's int value?

For Java 7, increment operator '++' works on Integers. Below is a tested example

    Integer i = new Integer( 12 );
    System.out.println(i); //12
    i = i++;
    System.out.println(i); //13

How do you get the list of targets in a makefile?

If you have bash completion for make installed, the completion script will define a function _make_target_extract_script. This function is meant to create a sed script which can be used to obtain the targets as a list.

Use it like this:

# Make sure bash completion is enabled
source /etc/bash_completion 

# List targets from Makefile
sed -nrf <(_make_target_extract_script --) Makefile

Listing only directories using ls in Bash?

*/ is a filename matching pattern that matches directories in the current directory.

To list directories only, I like this function:

# Long list only directories
llod () {
  ls -l --color=always "$@" | grep --color=never '^d'
}

Put it in your .bashrc file.

Usage examples:

llod       # Long listing of all directories in current directory
llod -tr   # Same but in chronological order oldest first
llod -d a* # Limit to directories beginning with letter 'a'
llod -d .* # Limit to hidden directories

Note: it will break if you use the -i option. Here is a fix for that:

# Long list only directories
llod () {
  ls -l --color=always "$@" | egrep --color=never '^d|^[[:digit:]]+ d'
}

MYSQL Sum Query with IF Condition

How about this?

SUM(IF(PaymentType = "credit card", totalamount, 0)) AS CreditCardTotal

Total size of the contents of all the files in a directory

cd to directory, then:

du -sh

ftw!

Originally wrote about it here: https://ao.gl/get-the-total-size-of-all-the-files-in-a-directory/

What causes "Unable to access jarfile" error?

First run: java -version

and then run: java -jar Calculator.jar

This worked for me.

Python Infinity - Any caveats?

Python's implementation follows the IEEE-754 standard pretty well, which you can use as a guidance, but it relies on the underlying system it was compiled on, so platform differences may occur. Recently¹, a fix has been applied that allows "infinity" as well as "inf", but that's of minor importance here.

The following sections equally well apply to any language that implements IEEE floating point arithmetic correctly, it is not specific to just Python.

Comparison for inequality

When dealing with infinity and greater-than > or less-than < operators, the following counts:

any number including +inf is higher than -inf
any number including -inf is lower than +inf
+inf is neither higher nor lower than +inf
-inf is neither higher nor lower than -inf
any comparison involving NaN is false (inf is neither higher, nor lower than NaN)

Comparison for equality

When compared for equality, +inf and +inf are equal, as are -inf and -inf. This is a much debated issue and may sound controversial to you, but it's in the IEEE standard and Python behaves just like that.

Of course, +inf is unequal to -inf and everything, including NaN itself, is unequal to NaN.

Calculations with infinity

Most calculations with infinity will yield infinity, unless both operands are infinity, when the operation division or modulo, or with multiplication with zero, there are some special rules to keep in mind:

when multiplied by zero, for which the result is undefined, it yields NaN
when dividing any number (except infinity itself) by infinity, which yields 0.0 or -0.0².
when dividing (including modulo) positive or negative infinity by positive or negative infinity, the result is undefined, so NaN.
when subtracting, the results may be surprising, but follow common math sense:
- when doing inf - inf, the result is undefined: NaN;
- when doing inf - -inf, the result is inf;
- when doing -inf - inf, the result is -inf;
- when doing -inf - -inf, the result is undefined: NaN.
when adding, it can be similarly surprising too:
- when doing inf + inf, the result is inf;
- when doing inf + -inf, the result is undefined: NaN;
- when doing -inf + inf, the result is undefined: NaN;
- when doing -inf + -inf, the result is -inf.
using math.pow, pow or ** is tricky, as it doesn't behave as it should. It throws an overflow exception when the result with two real numbers is too high to fit a double precision float (it should return infinity), but when the input is inf or -inf, it behaves correctly and returns either inf or 0.0. When the second argument is NaN, it returns NaN, unless the first argument is 1.0. There are more issues, not all covered in the docs.
math.exp suffers the same issues as math.pow. A solution to fix this for overflow is to use code similar to this:
```
try:
    res = math.exp(420000)
except OverflowError:
    res = float('inf')
```

Notes

Note 1: as an additional caveat, that as defined by the IEEE standard, if your calculation result under-or overflows, the result will not be an under- or overflow error, but positive or negative infinity: 1e308 * 10.0 yields inf.

Note 2: because any calculation with NaN returns NaN and any comparison to NaN, including NaN itself is false, you should use the math.isnan function to determine if a number is indeed NaN.

Note 3: though Python supports writing float('-NaN'), the sign is ignored, because there exists no sign on NaN internally. If you divide -inf / +inf, the result is NaN, not -NaN (there is no such thing).

Note 4: be careful to rely on any of the above, as Python relies on the C or Java library it was compiled for and not all underlying systems implement all this behavior correctly. If you want to be sure, test for infinity prior to doing your calculations.

¹) Recently means since version 3.2.
²) Floating points support positive and negative zero, so: x / float('inf') keeps its sign and -1 / float('inf') yields -0.0, 1 / float(-inf) yields -0.0, 1 / float('inf') yields 0.0 and -1/ float(-inf) yields 0.0. In addition, 0.0 == -0.0 is true, you have to manually check the sign if you don't want it to be true.

How to read data of an Excel file using C#?

Why don't you create OleDbConnection? There are a lot of available resources in the Internet. Here is an example

OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+filename+";Extended Properties=Excel 8.0");
con.Open();
try
{
     //Create Dataset and fill with imformation from the Excel Spreadsheet for easier reference
     DataSet myDataSet = new DataSet();
     OleDbDataAdapter myCommand = new OleDbDataAdapter(" SELECT * FROM ["+listname+"$]" , con);
     myCommand.Fill(myDataSet);
     con.Close();
     richTextBox1.AppendText("\nDataSet Filled");

     //Travers through each row in the dataset
     foreach (DataRow myDataRow in myDataSet.Tables[0].Rows)
     {
          //Stores info in Datarow into an array
          Object[] cells = myDataRow.ItemArray;
          //Traverse through each array and put into object cellContent as type Object
          //Using Object as for some reason the Dataset reads some blank value which
          //causes a hissy fit when trying to read. By using object I can convert to
          //String at a later point.
          foreach (object cellContent in cells)
          {
               //Convert object cellContect into String to read whilst replacing Line Breaks with a defined character
               string cellText = cellContent.ToString();
               cellText = cellText.Replace("\n", "|");
               //Read the string and put into Array of characters chars
               richTextBox1.AppendText("\n"+cellText);
          }
     }
     //Thread.Sleep(15000);
}
catch (Exception ex)
{
     MessageBox.Show(ex.ToString());
     //Thread.Sleep(15000);
}
finally
{
     con.Close();
}

Python method for reading keypress?

I really did not want to post this as a comment because I would need to comment all answers and the original question.

All of the answers seem to rely on MSVCRT Microsoft Visual C Runtime. If you would like to avoid that dependency :

In case you want cross platform support, using the library here:

https://pypi.org/project/getkey/#files

https://github.com/kcsaff/getkey

Can allow for a more elegant solution.

Code example:

from getkey import getkey, keys
key = getkey()
if key == keys.UP:
  ...  # Handle the UP key
elif key == keys.DOWN:
  ...  # Handle the DOWN key
elif key == 'a':
  ...  # Handle the `a` key
elif key == 'Y':
  ...  # Handle `shift-y`
else:
  # Handle other text characters
  buffer += key
  print(buffer)

How to use a variable in the replacement side of the Perl substitution operator?

I would suggest something like:

$text =~ m{(.*)$find(.*)};
$text = $1 . $replace . $2;

It is quite readable and seems to be safe. If multiple replace is needed, it is easy:

while ($text =~ m{(.*)$find(.*)}){
     $text = $1 . $replace . $2;
}

How do I consume the JSON POST data in an Express application

Sometimes you don't need third party libraries to parse JSON from text. Sometimes all you need it the following JS command, try it first:

        const res_data = JSON.parse(body);

How to detect input type=file "change" for the same file?

VueJs solution

<input
                type="file"
                style="display: none;"
                ref="fileInput"
                accept="*"
                @change="onFilePicked"
                @click="$refs.fileInput.value=null"
>

How to correctly catch change/focusOut event on text input in React.js?

You'd need to be careful as onBlur has some caveats in IE11 (How to use relatedTarget (or equivalent) in IE?, https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/relatedTarget).

There is, however, no way to use onFocusOut in React as far as I can tell. See the issue on their github https://github.com/facebook/react/issues/6410 if you need more information.

Converting between datetime, Timestamp and datetime64

One option is to use str, and then to_datetime (or similar):

In [11]: str(dt64)
Out[11]: '2012-05-01T01:00:00.000000+0100'

In [12]: pd.to_datetime(str(dt64))
Out[12]: datetime.datetime(2012, 5, 1, 1, 0, tzinfo=tzoffset(None, 3600))

Note: it is not equal to dt because it's become "offset-aware":

In [13]: pd.to_datetime(str(dt64)).replace(tzinfo=None)
Out[13]: datetime.datetime(2012, 5, 1, 1, 0)

This seems inelegant.

Update: this can deal with the "nasty example":

In [21]: dt64 = numpy.datetime64('2002-06-28T01:00:00.000000000+0100')

In [22]: pd.to_datetime(str(dt64)).replace(tzinfo=None)
Out[22]: datetime.datetime(2002, 6, 28, 1, 0)

Make a hyperlink textview in android

Python decorators in classes

import functools


class Example:

    def wrapper(func):
        @functools.wraps(func)
        def wrap(self, *args, **kwargs):
            print("inside wrap")
            return func(self, *args, **kwargs)
        return wrap

    @wrapper
    def method(self):
        print("METHOD")

    wrapper = staticmethod(wrapper)


e = Example()
e.method()

How to find the path of the local git repository when I am possibly in a subdirectory

git rev-parse --show-toplevel

could be enough if executed within a git repo.
From git rev-parse man page:

--show-toplevel

Show the absolute path of the top-level directory.

For older versions (before 1.7.x), the other options are listed in "Is there a way to get the git root directory in one command?":

git rev-parse --git-dir

That would give the path of the .git directory.

The OP mentions:

git rev-parse --show-prefix

which returns the local path under the git repo root. (empty if you are at the git repo root)

Note: for simply checking if one is in a git repo, I find the following command quite expressive:

git rev-parse --is-inside-work-tree

And yes, if you need to check if you are in a .git git-dir folder:

git rev-parse --is-inside-git-dir

Programmatically Hide/Show Android Soft Keyboard

Adding this to your code android:focusableInTouchMode="true" will make sure that your keypad doesn't appear on startup for your edittext box. You want to add this line to your linear layout that contains the EditTextBox. You should be able to play with this to solve both your problems. I have tested this. Simple solution.

ie: In your app_list_view.xml file

<LinearLayout 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" 
    android:focusableInTouchMode="true">
    <EditText 
        android:id="@+id/filter_edittext"       
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:hint="Search" 
        android:inputType="text" 
        android:maxLines="1"/>
    <ListView 
        android:id="@id/android:list" 
        android:layout_height="fill_parent"
        android:layout_weight="1.0" 
        android:layout_width="fill_parent" 
        android:focusable="true" 
        android:descendantFocusability="beforeDescendants"/>
</LinearLayout>

------------------ EDIT: To Make keyboard appear on startup -----------------------

This is to make they Keyboard appear on the username edittextbox on startup. All I've done is added an empty Scrollview to the bottom of the .xml file, this puts the first edittext into focus and pops up the keyboard. I admit this is a hack, but I am assuming you just want this to work. I've tested it, and it works fine.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:paddingLeft="20dip"  
    android:paddingRight="20dip">
    <EditText 
        android:id="@+id/userName" 
        android:singleLine="true" 
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content" 
        android:hint="Username"  
        android:imeOptions="actionDone" 
        android:inputType="text"
        android:maxLines="1"
       />
    <EditText 
        android:id="@+id/password" 
        android:password="true" 
        android:singleLine="true"  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:hint="Password" />
    <ScrollView
        android:id="@+id/ScrollView01"  
        android:layout_height="fill_parent"   
        android:layout_width="fill_parent"> 
    </ScrollView>
</LinearLayout>

If you are looking for a more eloquent solution, I've found this question which might help you out, it is not as simple as the solution above but probably a better solution. I haven't tested it but it apparently works. I think it is similar to the solution you've tried which didn't work for you though.

Hope this is what you are looking for.

Cheers!

jQuery: Performing synchronous AJAX requests

You're using the ajax function incorrectly. Since it's synchronous it'll return the data inline like so:

var remote = $.ajax({
    type: "GET",
    url: remote_url,
    async: false
}).responseText;

Cosine Similarity between 2 Number Lists

Another version, if you have a scenario where you have list of vectors and a query vector and you want to compute the cosine similarity of query vector with all the vectors in the list, you can do it in one go in the below fashion:

>>> import numpy as np

>>> A      # list of vectors, shape -> m x n
array([[ 3, 45,  7,  2],
       [ 1, 23,  3,  4]])

>>> B      # query vector, shape -> 1 x n
array([ 2, 54, 13, 15])

>>> similarity_scores = A.dot(B)/ (np.linalg.norm(A, axis=1) * np.linalg.norm(B))

>>> similarity_scores
array([0.97228425, 0.99026919])

Press Enter to move to next control

You could also write your own Control for this, in case you want to use this more often. Assuming you have multiple TextBoxes in a Grid, it would look something like this:

public class AdvanceOnEnterTextBox : UserControl
{

    TextBox _TextBox;
    public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(String), typeof(AdvanceOnEnterTextBox), null);
    public static readonly DependencyProperty InputScopeProperty = DependencyProperty.Register("InputScope", typeof(InputScope), typeof(AdvanceOnEnterTextBox), null);


    public AdvanceOnEnterTextBox()
    {
        _TextBox = new TextBox();
        _TextBox.KeyDown += customKeyDown;
        Content = _TextBox;

    }


    /// <summary>
    /// Text for the TextBox
    /// </summary>
    public String Text
    {
        get { return _TextBox.Text; }
        set { _TextBox.Text = value; }
    }


    /// <summary>
    /// Inputscope for the Custom Textbox
    /// </summary>
    public InputScope InputScope
    {
        get { return _TextBox.InputScope; }
        set { _TextBox.InputScope = value; }
    }


    void customKeyDown(object sender, KeyEventArgs e)
    {
        if (!e.Key.Equals(Key.Enter)) return;

        var element = ((TextBox)sender).Parent as AdvanceOnEnterTextBox;
        if (element != null)
        {
            int currentElementPosition = ((Grid)element.Parent).Children.IndexOf(element);
            try
            {
                // Jump to the next AdvanceOnEnterTextBox (assuming, that Labels are inbetween).
                ((AdvanceOnEnterTextBox)((Grid)element.Parent).Children.ElementAt(currentElementPosition + 2)).Focus();
            }
            catch (Exception)
            {
                // Close Keypad if this was the last AdvanceOnEnterTextBox
                ((AdvanceOnEnterTextBox)((Grid)element.Parent).Children.ElementAt(currentElementPosition)).IsEnabled = false;
                ((AdvanceOnEnterTextBox)((Grid)element.Parent).Children.ElementAt(currentElementPosition)).IsEnabled = true;
            }
        }
    }
}

How to add multiple jar files in classpath in linux

Step 1.

vi ~/.bashrc

Step 2. Append this line on the last:

export CLASSPATH=$CLASSPATH:/home/abc/lib/*;  (Assuming the jars are stored in /home/abc/lib)

Step 3.

source ~/.bashrc

After these steps direct complile and run your programs(e.g. javac xyz.java)

Fastest way to check if a string matches a regexp in ruby?

What I am wondering is if there is any strange way to make this check even faster, maybe exploiting some strange method in Regexp or some weird construct.

Regexp engines vary in how they implement searches, but, in general, anchor your patterns for speed, and avoid greedy matches, especially when searching long strings.

The best thing to do, until you're familiar with how a particular engine works, is to do benchmarks and add/remove anchors, try limiting searches, use wildcards vs. explicit matches, etc.

The Fruity gem is very useful for quickly benchmarking things, because it's smart. Ruby's built-in Benchmark code is also useful, though you can write tests that fool you by not being careful.

I've used both in many answers here on Stack Overflow, so you can search through my answers and will see lots of little tricks and results to give you ideas of how to write faster code.

The biggest thing to remember is, it's bad to prematurely optimize your code before you know where the slowdowns occur.

Is there an SQLite equivalent to MySQL's DESCRIBE [table]?

The SQLite command line utility has a .schema TABLENAME command that shows you the create statements.

What is the relative performance difference of if/else versus switch statement in Java?

For most switch and most if-then-else blocks, I can't imagine that there are any appreciable or significant performance related concerns.

But here's the thing: if you're using a switch block, its very use suggests that you're switching on a value taken from a set of constants known at compile time. In this case, you really shouldn't be using switch statements at all if you can use an enum with constant-specific methods.

Compared to a switch statement, an enum provides better type safety and code that is easier to maintain. Enums can be designed so that if a constant is added to the set of constants, your code won't compile without providing a constant-specific method for the new value. On the other hand, forgetting to add a new case to a switch block can sometimes only be caught at run time if you're lucky enough to have set your block up to throw an exception.

Performance between switch and an enum constant-specific method should not be significantly different, but the latter is more readable, safer, and easier to maintain.

Removing an activity from the history stack

Removing a activity from a History is done By setting the flag before the activity You Don't want

A->B->C->D

Suppose A,B,C and D are 4 Activities if you want to clear B and C then set flag

intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);

In the activity A and B

Here is the code bit

Intent intent = new Intent(this,Activity_B.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(intent);

What is the difference between Scala's case class and class?

The case class construct in Scala can also be seen as a convenience to remove some boilerplate.

When constructing a case class Scala gives you the following.

It creates a class as well as its companion object
Its companion object implements the apply method that you are able to use as a factory method. You get the syntactic sugar advantage of not having to use the new keyword.

Because the class is immutable you get accessors, which are just the variables (or properties) of the class but no mutators (so no ability to change the variables). The constructor parameters are automatically available to you as public read only fields. Much nicer to use than Java bean construct.

You also get hashCode, equals, and toString methods by default and the equals method compares an object structurally. A copy method is generated to be able to clone an object (with some fields having new values provided to the method).

The biggest advantage as has been mentioned previously is the fact that you can pattern match on case classes. The reason for this is because you get the unapply method which lets you deconstruct a case class to extract its fields.

In essence what you are getting from Scala when creating a case class (or a case object if your class takes no arguments) is a singleton object which serves the purpose as a factory and as an extractor .

Text-decoration: none not working

Add this statement on your header tag:

<style>
a:link{
  text-decoration: none!important;
  cursor: pointer;
}
</style>

How do I check if an HTML element is empty using jQuery?

JavaScript

var el= document.querySelector('body'); 
console.log(el);
console.log('Empty : '+ isEmptyTag(el));
console.log('Having Children : '+ hasChildren(el));


function isEmptyTag(tag) { 
    return (tag.innerHTML.trim() === '') ? true : false ;
}
function hasChildren(tag) {
    //return (tag.childElementCount !== 0) ? true : false ; // Not For IE
    //return (tag.childNodes.length !== 0) ? true : false ; // Including Comments
    return (tag.children.length !== 0) ? true : false ; // Only Elements
}

try using any of this!

document.getElementsByTagName('div')[0];
document.getElementsByClassName('topbar')[0];

document.querySelectorAll('div')[0];
document.querySelector('div'); // gets the first element.
?

Create a date from day month and year with T-SQL

Or using just a single dateadd function:

DECLARE @day int, @month int, @year int
SELECT @day = 4, @month = 3, @year = 2011

SELECT dateadd(mm, (@year - 1900) * 12 + @month - 1 , @day - 1)

How do I add a library path in cmake?

The simplest way of doing this would be to add

include_directories(${CMAKE_SOURCE_DIR}/inc)
link_directories(${CMAKE_SOURCE_DIR}/lib)

add_executable(foo ${FOO_SRCS})
target_link_libraries(foo bar) # libbar.so is found in ${CMAKE_SOURCE_DIR}/lib

The modern CMake version that doesn't add the -I and -L flags to every compiler invocation would be to use imported libraries:

add_library(bar SHARED IMPORTED) # or STATIC instead of SHARED
set_target_properties(bar PROPERTIES
  IMPORTED_LOCATION "${CMAKE_SOURCE_DIR}/lib/libbar.so"
  INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_SOURCE_DIR}/include/libbar"
)

set(FOO_SRCS "foo.cpp")
add_executable(foo ${FOO_SRCS})
target_link_libraries(foo bar) # also adds the required include path

If setting the INTERFACE_INCLUDE_DIRECTORIES doesn't add the path, older versions of CMake also allow you to use target_include_directories(bar PUBLIC /path/to/include). However, this no longer works with CMake 3.6 or newer.

Android: Share plain text using intent (to all messaging apps)

Use the code as:

    /*Create an ACTION_SEND Intent*/
    Intent intent = new Intent(android.content.Intent.ACTION_SEND);
    /*This will be the actual content you wish you share.*/
    String shareBody = "Here is the share content body";
    /*The type of the content is text, obviously.*/
    intent.setType("text/plain");
    /*Applying information Subject and Body.*/
    intent.putExtra(android.content.Intent.EXTRA_SUBJECT, getString(R.string.share_subject));
    intent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
    /*Fire!*/
    startActivity(Intent.createChooser(intent, getString(R.string.share_using)));

Moment.js - how do I get the number of years since a date, not rounded up?

I found that it would work to reset the month to January for both dates (the provided date and the present):

> moment("02/26/1978", "MM/DD/YYYY").month(0).from(moment().month(0))
"34 years ago"

How to filter empty or NULL names in a QuerySet?

Firstly, the Django docs strongly recommend not using NULL values for string-based fields such as CharField or TextField. Read the documentation for the explanation:

https://docs.djangoproject.com/en/dev/ref/models/fields/#null

Solution: You can also chain together methods on QuerySets, I think. Try this:

Name.objects.exclude(alias__isnull=True).exclude(alias="")

That should give you the set you're looking for.

How best to include other scripts?

Steve's reply is definitely the correct technique but it should be refactored so that your installpath variable is in a separate environment script where all such declarations are made.

Then all scripts source that script and should installpath change, you only need to change it in one location. Makes things more, er, futureproof. God I hate that word! (-:

BTW You should really refer to the variable using ${installpath} when using it in the way shown in your example:

. ${installpath}/incl.sh

If the braces are left out, some shells will try and expand the variable "installpath/incl.sh"!

How do I remove blank pages coming between two chapters in Appendix?

If you specify the option 'openany' in the \documentclass declaration each chapter in the book (I'm guessing you're using the book class as chapters open on the next page in reports and articles don't have chapters) will open on a new page, not necessarily the next odd-numbered page.

Of course, that's not quite what you want. I think you want to set openany for chapters in the appendix. 'fraid I don't know how to do that, I suspect that you need to roll up your sleeves and wrestle with TeX itself

How to set background image in Java?

Or try this ;)

try {
  this.setContentPane(
    new JLabel(new ImageIcon(ImageIO.read(new File("your_file.jpeg")))));
} catch (IOException e) {};

Undefined symbols for architecture armv7

I have have multiple @interfaces in the .h file and hadn't yet included the all of the corresponding @implementation directives. Make sure that they are all balanced out.

PostgreSQL JOIN data from 3 tables

Maybe the following is what you are looking for:

SELECT name, pathfilename
  FROM table1
  NATURAL JOIN table2
  NATURAL JOIN table3
  WHERE name = 'John';

Plot different DataFrames in the same figure

Although Chang's answer explains how to plot multiple times on the same figure, in this case you might be better off in this case using a groupby and unstacking:

(Assuming you have this in dataframe, with datetime index already)

In [1]: df
Out[1]:
            value  
datetime                         
2010-01-01      1  
2010-02-01      1  
2009-01-01      1  

# create additional month and year columns for convenience
df['Month'] = map(lambda x: x.month, df.index)
df['Year'] = map(lambda x: x.year, df.index)    

In [5]: df.groupby(['Month','Year']).mean().unstack()
Out[5]:
       value      
Year    2009  2010
Month             
1          1     1
2        NaN     1

Now it's easy to plot (each year as a separate line):

df.groupby(['Month','Year']).mean().unstack().plot()

"unable to locate adb" using Android Studio

Due to some problem my adb.exe, was lost. My space of work suffered an electrical energy interruption, after that, I could not run or compile android programs.

Adb.exe is a file which should be located in your [android directory]/sdk/platform-tools. In my case, the file dissapeared, however the platform-tools was ther. My solution was as follows:

I changed the name directory of [android directory]/sdk/platform-tools towards platform-tools_OLD, in order to hide it for android studio without erase it.
In [android directory]/sdk there is a file SDK Manager.exe, ... I launched it.
A window of "Android SDK Manager" is shown, then, in the Tools folder I chose "Android SDK Platform Tools" and then, Install packages.
Enter to Android Studio

This was well for me

How do I correct this Illegal String Offset?

I get the same error in WP when I use php ver 7.1.6 - just take your php version back to 7.0.20 and the error will disappear.

how to import csv data into django models

You can also use, django-adaptors

>>> from adaptor.model import CsvModel
>>> class MyCSvModel(CsvModel):
...     name = CharField()
...     age = IntegerField()
...     length = FloatField()
...
...     class Meta:
...         delimiter = ";"

You declare a MyCsvModel which will match to a CSV file like this:

Anthony;27;1.75

To import the file or any iterable object, just do:

>>> my_csv_list = MyCsvModel.import_data(data = open("my_csv_file_name.csv"))
>>> first_line = my_csv_list[0]
>>> first_line.age
    27

Without an explicit declaration, data and columns are matched in the same order:

Anthony --> Column 0 --> Field 0 --> name
27      --> Column 1 --> Field 1 --> age
1.75    --> Column 2 --> Field 2 --> length

Self-reference for cell, column and row in worksheet functions

For a non-volatile solution, how about for 2007+:

for cell    =INDEX($A$1:$XFC$1048576,ROW(),COLUMN())
for column  =INDEX($A$1:$XFC$1048576,0,COLUMN())
for row     =INDEX($A$1:$XFC$1048576,ROW(),0)

I have weird bug on Excel 2010 where it won't accept the very last row or column for these formula (row 1048576 & column XFD), so you may need to reference these one short. Not sure if that's the same for any other versions so appreciate feedback and edit.

and for 2003 (INDEX became non-volatile in '97):

for cell    =INDEX($A$1:$IV$65536,ROW(),COLUMN())
for column  =INDEX($A$1:$IV$65536,0,COLUMN())
for row     =INDEX($A$1:$IV$65536,ROW(),0)

How do I connect to this localhost from another computer on the same network?

This tool saved me a lot, since I have no Admin permission on my machine and already had nodejs installed. For some reason the configuration on my network does not give me access to other machines just pointing the IP on the browser.

# Using a local.dev vhost
$ browser-sync start --proxy

# Using a local.dev vhost with PORT
$ browser-sync start --proxy local.dev:8001

# Using a localhost address
$ browser-sync start --proxy localhost:8001

# Using a localhost address in a sub-dir
$ browser-sync start --proxy localhost:8080/site1

http://www.browsersync.io/docs/command-line/

ObservableCollection Doesn't support AddRange method, so I get notified for each item added, besides what about INotifyCollectionChanging?

ObservableRangeCollection should pass a test like

[Test]
public void TestAddRangeWhileBoundToListCollectionView()
{
    int collectionChangedEventsCounter = 0;
    int propertyChangedEventsCounter = 0;
    var collection = new ObservableRangeCollection<object>();

    collection.CollectionChanged += (sender, e) => { collectionChangedEventsCounter++; };
    (collection as INotifyPropertyChanged).PropertyChanged += (sender, e) => { propertyChangedEventsCounter++; };

    var list = new ListCollectionView(collection);

    collection.AddRange(new[] { new object(), new object(), new object(), new object() });

    Assert.AreEqual(4, collection.Count);
    Assert.AreEqual(1, collectionChangedEventsCounter);
    Assert.AreEqual(2, propertyChangedEventsCounter);
}

otherwise we get

System.NotSupportedException : Range actions are not supported.

while using with a control.

I do not see an ideal solution, but NotifyCollectionChangedAction.Reset instead of Add/Remove partially solve the problem. See http://blogs.msdn.com/b/nathannesbit/archive/2009/04/20/addrange-and-observablecollection.aspx as was mentioned by net_prog

C# How to determine if a number is a multiple of another?

there are some syntax errors to your program heres a working code;

#include<stdio.h>
int main()
{
int a,b;
printf("enter any two number\n");
scanf("%d%d",&a,&b);
if (a%b==0){
printf("this is  multiple number");
}
else if (b%a==0){
printf("this is multiple number");
}
else{
printf("this is not multiple number");
return 0;
}

}

MySQL date format DD/MM/YYYY select query?

for my case this worked

str_to_date(date, '%e/%m/%Y' )

Microsoft Excel mangles Diacritics in .csv files?

Check the encoding in which you are generating the file, to make excel display the file correctly you must use the system default codepage.

Wich language are you using? if it's .Net you only need to use Encoding.Default while generating the file.

Execute jQuery function after another function completes

You should use a callback parameter:

function Typer(callback)
{
    var srcText = 'EXAMPLE ';
    var i = 0;
    var result = srcText[i];
    var interval = setInterval(function() {
        if(i == srcText.length - 1) {
            clearInterval(interval);
            callback();
            return;
        }
        i++;
        result += srcText[i].replace("\n", "<br />");
        $("#message").html(result);
    },
    100);
    return true;


}

function playBGM () {
    alert("Play BGM function");
    $('#bgm').get(0).play();
}

Typer(function () {
    playBGM();
});

// or one-liner: Typer(playBGM);

So, you pass a function as parameter (callback) that will be called in that if before return.

Also, this is a good article about callbacks.

_x000D_

function Typer(callback)_x000D_
{_x000D_
    var srcText = 'EXAMPLE ';_x000D_
    var i = 0;_x000D_
    var result = srcText[i];_x000D_
    var interval = setInterval(function() {_x000D_
        if(i == srcText.length - 1) {_x000D_
            clearInterval(interval);_x000D_
            callback();_x000D_
            return;_x000D_
        }_x000D_
        i++;_x000D_
        result += srcText[i].replace("\n", "<br />");_x000D_
        $("#message").html(result);_x000D_
    },_x000D_
    100);_x000D_
    return true;_x000D_
        _x000D_
    _x000D_
}_x000D_
_x000D_
function playBGM () {_x000D_
    alert("Play BGM function");_x000D_
    $('#bgm').get(0).play();_x000D_
}_x000D_
_x000D_
Typer(function () {_x000D_
    playBGM();_x000D_
});

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>_x000D_
<div id="message">_x000D_
</div>_x000D_
<audio id="bgm" src="http://www.freesfx.co.uk/rx2/mp3s/9/10780_1381246351.mp3">_x000D_
</audio>

_x000D_

JSFIDDLE

Where will log4net create this log file?

FileAppender appender = repository.GetAppenders().OfType<FileAppender>().FirstOrDefault();
if (appender != null)
    logger.DebugFormat("log file located at : {0}", appender.File);
else
    logger.Error("Could not locate fileAppender");

Multiple radio button groups in MVC 4 Razor

I fixed a similar issue building a RadioButtonFor with pairs of text/value from a SelectList. I used a ViewBag to send the SelectList to the View, but you can use data from model too. My web application is a Blog and I have to build a RadioButton with some types of articles when he is writing a new post.

The code below was simplyfied.

List<SelectListItem> items = new List<SelectListItem>();

Dictionary<string, string> dictionary = new Dictionary<string, string>();

dictionary.Add("Texto", "1");
dictionary.Add("Foto", "2");
dictionary.Add("Vídeo", "3");

foreach (KeyValuePair<string, string> pair in objBLL.GetTiposPost())
{
    items.Add(new SelectListItem() { Text = pair.Key, Value = pair.Value, Selected = false });
}

ViewBag.TiposPost = new SelectList(items, "Value", "Text");

In the View, I used a foreach to build a radiobutton.

<div class="form-group">
    <div class="col-sm-10">
        @foreach (var item in (SelectList)ViewBag.TiposPost)
        {
            @Html.RadioButtonFor(model => model.IDTipoPost, item.Value, false)
            <label class="control-label">@item.Text</label>
        }

    </div>
</div>

Notice that I used RadioButtonFor in order to catch the option value selected by user, in the Controler, after submit the form. I also had to put the item.Text outside the RadioButtonFor in order to show the text options.

Hope it's useful!

Why is "using namespace std;" considered bad practice?

I agree with everything Greg wrote, but I'd like to add: It can even get worse than Greg said!

Library Foo 2.0 could introduce a function, Quux(), that is an unambiguously better match for some of your calls to Quux() than the bar::Quux() your code called for years. Then your code still compiles, but it silently calls the wrong function and does god-knows-what. That's about as bad as things can get.

Keep in mind that the std namespace has tons of identifiers, many of which are very common ones (think list, sort, string, iterator, etc.) which are very likely to appear in other code, too.

If you consider this unlikely: There was a question asked here on Stack Overflow where pretty much exactly this happened (wrong function called due to omitted std:: prefix) about half a year after I gave this answer. Here is another, more recent example of such a question. So this is a real problem.

Here's one more data point: Many, many years ago, I also used to find it annoying having to prefix everything from the standard library with std::. Then I worked in a project where it was decided at the start that both using directives and declarations are banned except for function scopes. Guess what? It took most of us very few weeks to get used to writing the prefix, and after a few more weeks most of us even agreed that it actually made the code more readable. There's a reason for that: Whether you like shorter or longer prose is subjective, but the prefixes objectively add clarity to the code. Not only the compiler, but you, too, find it easier to see which identifier is referred to.

In a decade, that project grew to have several million lines of code. Since these discussions come up again and again, I once was curious how often the (allowed) function-scope using actually was used in the project. I grep'd the sources for it and only found one or two dozen places where it was used. To me this indicates that, once tried, developers don't find std:: painful enough to employ using directives even once every 100 kLoC even where it was allowed to be used.

Bottom line: Explicitly prefixing everything doesn't do any harm, takes very little getting used to, and has objective advantages. In particular, it makes the code easier to interpret by the compiler and by human readers — and that should probably be the main goal when writing code.

How to permanently add a private key with ssh-add on Ubuntu?

very simple ^_^ two steps

1.yum install keychain

2.add code below to .bash_profile

/usr/bin/keychain $HOME/.ssh/id_dsa
source $HOME/.keychain/$HOSTNAME-sh

python requests get cookies

Alternatively, you can use requests.Session and observe cookies before and after a request:

>>> import requests
>>> session = requests.Session()
>>> print(session.cookies.get_dict())
{}
>>> response = session.get('http://google.com')
>>> print(session.cookies.get_dict())
{'PREF': 'ID=5514c728c9215a9a:FF=0:TM=1406958091:LM=1406958091:S=KfAG0U9jYhrB0XNf', 'NID': '67=TVMYiq2wLMNvJi5SiaONeIQVNqxSc2RAwVrCnuYgTQYAHIZAGESHHPL0xsyM9EMpluLDQgaj3db_V37NjvshV-eoQdA8u43M8UwHMqZdL-S2gjho8j0-Fe1XuH5wYr9v'}

Can Twitter Bootstrap alerts fade in as well as out?

None of the current answers worked for me. I'm using Bootstrap 3.

I liked what Rob Vermeer was doing and started from his response.

For a fade in and then fade out effect, I just used wrote the following function and used jQuery:

Html on my page to add the alert(s) to:

        <div class="alert-messages text-center">
        </div>

Javascript function to show and dismiss the alert.

function showAndDismissAlert(type, message) {
    var htmlAlert = '<div class="alert alert-' + type + '">' + message + '</div>';

    // Prepend so that alert is on top, could also append if we want new alerts to show below instead of on top.
    $(".alert-messages").prepend(htmlAlert);

    // Since we are prepending, take the first alert and tell it to fade in and then fade out.
    // Note: if we were appending, then should use last() instead of first()
    $(".alert-messages .alert").first().hide().fadeIn(200).delay(2000).fadeOut(1000, function () { $(this).remove(); });
}

Then, to show and dismiss the alert, just call the function like this:

    showAndDismissAlert('success', 'Saved Successfully!');
    showAndDismissAlert('danger', 'Error Encountered');
    showAndDismissAlert('info', 'Message Received');

As a side note, I styled the div.alert-messages fixed on top:

    <style>
    div.alert-messages {
        position: fixed;
        top: 50px;
        left: 25%;
        right: 25%;
        z-index: 7000;
    }
    </style>

Is there a "theirs" version of "git merge -s ours"?

I think what you actually want is:

git checkout -B mergeBranch branchB
git merge -s ours branchA
git checkout branchA
git merge mergeBranch
git branch -D mergeBranch

This seems clumsy, but it should work. The only think I really dislike about this solution is the git history will be confusing... But at least the history will be completely preserved and you won't need to do something special for deleted files.

How to run Gulp tasks sequentially one after the other

The only good solution to this problem can be found in the gulp documentation:

var gulp = require('gulp');

// takes in a callback so the engine knows when it'll be done
gulp.task('one', function(cb) {
  // do stuff -- async or otherwise
  cb(err); // if err is not null and not undefined, the orchestration will stop, and 'two' will not run
});

// identifies a dependent task must be complete before this one begins
gulp.task('two', ['one'], function() {
  // task 'one' is done now
});

gulp.task('default', ['one', 'two']);
// alternatively: gulp.task('default', ['two']);

Moment get current date

Just call moment as a function without any arguments:

moment()

For timezone information with moment, look at the moment-timezone package: http://momentjs.com/timezone/

Developing C# on Linux

I would suggest using MonoDevelop.

It is pretty much explicitly designed for use with Mono, and all set up to develop in C#.

The simplest way to install it on Ubuntu would be to install the monodevelop package in Ubuntu. (link on Mono on ubuntu.com) (However, if you want to install a more recent version, I am not sure which PPA would be appropriate)

However, I would not recommend developing with the WinForms toolkit - I do not expect it to have the same behavior in Windows and Mono (the implementations are pretty different). For an overview of the UI toolkits that work with Mono, you can go to the information page on Mono-project.

How does numpy.histogram() work?

import numpy as np    
hist, bin_edges = np.histogram([1, 1, 2, 2, 2, 2, 3], bins = range(5))

Below, hist indicates that there are 0 items in bin #0, 2 in bin #1, 4 in bin #3, 1 in bin #4.

print(hist)
# array([0, 2, 4, 1])

bin_edges indicates that bin #0 is the interval [0,1), bin #1 is [1,2), ..., bin #3 is [3,4).

print (bin_edges)
# array([0, 1, 2, 3, 4]))

Play with the above code, change the input to np.histogram and see how it works.

But a picture is worth a thousand words:

import matplotlib.pyplot as plt
plt.bar(bin_edges[:-1], hist, width = 1)
plt.xlim(min(bin_edges), max(bin_edges))
plt.show()

enter image description here

GitHub "fatal: remote origin already exists"

In the special case that you are creating a new repository starting from an old repository that you used as template (Don't do this if this is not your case). Completely erase the git files of the old repository so you can start a new one:

rm -rf .git

And then restart a new git repository as usual:

git init
git add whatever.wvr ("git add --all" if you want to add all files)
git commit -m "first commit"
git remote add origin [email protected]:ppreyer/first_app.git
git push -u origin master

nodejs npm global config missing on windows

Even though we have the .NPMRC can be in 3 locations, Please NOTE THAT - the file under the Per-User NPM config location take precedence over the Global & Built-in configurations.

Global NPM config => C:\Users\%username%\AppData\Roaming\npm\etc\npmrc
Per-user NPM config => C:\Users\%username%.npmrc
Built-in NPM config => C:\Program Files\nodejs\node_modules\npm\npmrc

To find out which file is getting updated, try setting the proxy using the following command npm config set https-proxy https://username:[email protected]:6050

After that open the .npmrc files to see which file get updated.

How do I grant read access for a user to a database in SQL Server?

This is a two-step process:

you need to create a login to SQL Server for that user, based on its Windows account
```
CREATE LOGIN [<domainName>\<loginName>] FROM WINDOWS;
```

you need to grant this login permission to access a database:

USE (your database)
CREATE USER (username) FOR LOGIN (your login name)

Once you have that user in your database, you can give it any rights you want, e.g. you could assign it the db_datareader database role to read all tables.

USE (your database)
EXEC sp_addrolemember 'db_datareader', '(your user name)'

Excel 2010: how to use autocomplete in validation list

As other people suggested, you need to use a combobox. However, most tutorials show you how to set up just one combobox and the process is quite tedious.

As I faced this problem before when entering a large amount of data from a list, I can suggest you use this autocomplete add-in . It helps you create the combobox on any cells you select and you can define a list to appear in the dropdown.

How to replace foo by foo using PHP and regex?

$text='<span style="font-weight: bold;">Foo</span>';
$text=preg_replace( '/<span style="font-weight: bold;">(.*?)<\/span>/', '<strong>$1</strong>',$text);

Note: only work for your example.

How to remove square brackets in string using regex?

Use this regular expression to match square brackets or single quotes:

/[\[\]']+/g

Replace with the empty string.

_x000D_

console.log("['abc','xyz']".replace(/[\[\]']+/g,''));

_x000D_

PHP simple foreach loop with HTML

This will work although when embedding PHP in HTML it is better practice to use the following form:

<table>
    <?php foreach($array as $key=>$value): ?>
    <tr>
        <td><?= $key; ?></td>
    </tr>
    <?php endforeach; ?>
</table>

You can find the doc for the alternative syntax on PHP.net

Spring MVC: Complex object as GET @RequestParam

I will add some short example from me.

The DTO class:

public class SearchDTO {
    private Long id[];

    public Long[] getId() {
        return id;
    }

    public void setId(Long[] id) {
        this.id = id;
    }
    // reflection toString from apache commons
    @Override
    public String toString() {
        return ReflectionToStringBuilder.toString(this, ToStringStyle.SHORT_PREFIX_STYLE);
    }
}

Request mapping inside controller class:

@RequestMapping(value="/handle", method=RequestMethod.GET)
@ResponseBody
public String handleRequest(SearchDTO search) {
    LOG.info("criteria: {}", search);
    return "OK";
}

Query:

http://localhost:8080/app/handle?id=353,234

Result:

[http-apr-8080-exec-7] INFO  c.g.g.r.f.w.ExampleController.handleRequest:59 - criteria: SearchDTO[id={353,234}]

I hope it helps :)

UPDATE / KOTLIN

Because currently I'm working a lot of with Kotlin if someone wants to define similar DTO the class in Kotlin should have the following form:

class SearchDTO {
    var id: Array<Long>? = arrayOf()

    override fun toString(): String {
        // to string implementation
    }
}

With the data class like this one:

data class SearchDTO(var id: Array<Long> = arrayOf())

the Spring (tested in Boot) returns the following error for request mentioned in answer:

"Failed to convert value of type 'java.lang.String[]' to required type 'java.lang.Long[]'; nested exception is java.lang.NumberFormatException: For input string: \"353,234\""

The data class will work only for the following request params form:

http://localhost:8080/handle?id=353&id=234

Be aware of this!

Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?

I think the point of those different types of logging is if you want your app to basically self filter its own logs. So Verbose could be to log absolutely everything of importance in your app, then the debug level would log a subset of the verbose logs, and then Info level will log a subset of the debug logs. When you get down to the Error logs, then you just want to log any sort of errors that may have occured. There is also a debug level called Fatal for when something really hits the fan in your app.

In general, you're right, it's basically arbitrary, and it's up to you to define what is considered a debug log versus informational, versus and error, etc. etc.

SSRS - Checking whether the data is null

try like this

= IIF( MAX( iif( IsNothing(Fields!.Reading.Value ), -1, Fields!.Reading.Value ) ) = -1, "",  FormatNumber(  MAX( iif( IsNothing(Fields!.Reading.Value ), -1, Fields!.Reading.Value ), "CellReading_Reading"),3)) )

Open an html page in default browser with VBA?

I find the most simple is

shell "explorer.exe URL"

This also works to open local folders.

NSPhotoLibraryUsageDescription key must be present in Info.plist to use camera roll

Thanks @rmaddy, I added this just after other key-string pairs in Info.plist and fixed the problem:

<key>NSPhotoLibraryUsageDescription</key>
<string>Photo Library Access Warning</string>

Edit:

I also ended up having similar problems on different components of my app. Ended up adding all these keys so far (after updating to Xcode8/iOS10):

<key>NSPhotoLibraryUsageDescription</key>
<string>This app requires access to the photo library.</string>
<key>NSMicrophoneUsageDescription</key>
<string>This app does not require access to the microphone.</string>
<key>NSCameraUsageDescription</key>
<string>This app requires access to the camera.</string>

Checkout this developer.apple.com link for full list of property list key references.

Full List:

Apple Music:

<key>NSAppleMusicUsageDescription</key>
<string>My description about why I need this capability</string>

Bluetooth:

<key>NSBluetoothPeripheralUsageDescription</key>  
<string>My description about why I need this capability</string>

Calendar:

<key>NSCalendarsUsageDescription</key>
<string>My description about why I need this capability</string>

Camera:

<key>NSCameraUsageDescription</key>
<string>My description about why I need this capability</string>

Contacts:

<key>NSContactsUsageDescription</key>
<string>My description about why I need this capability</string>

FaceID:

<key>NSFaceIDUsageDescription</key>
<string>My description about why I need this capability</string>

Health Share:

<key>NSHealthShareUsageDescription</key>
<string>My description about why I need this capability</string>

Health Update:

<key>NSHealthUpdateUsageDescription</key>
<string>My description about why I need this capability</string>

Home Kit:

<key>NSHomeKitUsageDescription</key>
<string>My description about why I need this capability</string>

Location:

<key>NSLocationUsageDescription</key>
<string>My description about why I need this capability</string>

Location (Always):

<key>NSLocationAlwaysUsageDescription</key>
<string>My description about why I need this capability</string>

Location (When in use):

<key>NSLocationWhenInUseUsageDescription</key>
<string>My description about why I need this capability</string>

Microphone:

<key>NSMicrophoneUsageDescription</key>
<string>My description about why I need this capability</string>

Motion (Accelerometer):

<key>NSMotionUsageDescription</key>
<string>My description about why I need this capability</string>

NFC (Near-field communication):

<key>NFCReaderUsageDescription</key>
<string>My description about why I need this capability</string>

Photo Library:

<key>NSPhotoLibraryUsageDescription</key>
<string>My description about why I need this capability</string>

Photo Library (Write-only access):

<key>NSPhotoLibraryAddUsageDescription</key>
<string>My description about why I need this capability</string>

Reminders:

<key>NSRemindersUsageDescription</key>
<string>My description about why I need this capability</string>

Siri:

<key>NSSiriUsageDescription</key>
<string>My description about why I need this capability</string>

Speech Recognition:

<key>NSSpeechRecognitionUsageDescription</key>
<string>My description about why I need this capability</string>

htaccess <Directory> deny from all

You can use from root directory:

RewriteEngine On
RewriteRule ^(?:system)\b.* /403.html

Or:

RewriteRule ^(?:system)\b.* /403.php # with header('HTTP/1.0 403 Forbidden');

Using OR & AND in COUNTIFS

There is probably a more efficient solution to your question, but following formula should do the trick:

=SUM(COUNTIFS(J1:J196,"agree",A1:A196,"yes"),COUNTIFS(J1:J196,"agree",A1:A196,"no"))

How do I find the location of Python module sources?

datetime is a builtin module, so there is no (Python) source file.

For modules coming from .py (or .pyc) files, you can use mymodule.__file__, e.g.

> import random
> random.__file__
'C:\\Python25\\lib\\random.pyc'

How do you check what version of SQL Server for a database using TSQL?

Getting only the major SQL Server version in a single select:

SELECT  SUBSTRING(ver, 1, CHARINDEX('.', ver) - 1)
FROM (SELECT CAST(serverproperty('ProductVersion') AS nvarchar) ver) as t

Returns 8 for SQL 2000, 9 for SQL 2005 and so on (tested up to 2012).

Copy array items into another array

The following seems simplest to me:

var newArray = dataArray1.slice();
newArray.push.apply(newArray, dataArray2);

As "push" takes a variable number of arguments, you can use the apply method of the push function to push all of the elements of another array. It constructs a call to push using its first argument ("newArray" here) as "this" and the elements of the array as the remaining arguments.

The slice in the first statement gets a copy of the first array, so you don't modify it.

Update If you are using a version of javascript with slice available, you can simplify the push expression to:

newArray.push(...dataArray2)

MongoDB logging all queries

I made a command line tool to activate the profiler activity and see the logs in a "tail"able way: "mongotail".

But the more interesting feature (also like tail) is to see the changes in "real time" with the -f option, and occasionally filter the result with grep to find a particular operation.

See documentation and installation instructions in: https://github.com/mrsarm/mongotail

SELECT DISTINCT on one column

Try this:

SELECT * FROM [TestData] WHERE Id IN(SELECT DISTINCT MIN(Id) FROM [TestData] GROUP BY Product)

ADB Shell Input Events

If you want to send a text to specific device when multiple devices connected. First look for the attached devices using adb devices

adb devices
List of devices attached
3004e25a57192200        device
31002d9e592b7300        device

then get your specific device id and try the following

adb -s 31002d9e592b7300 shell input text 'your text'

Return 0 if field is null in MySQL

You can try something like this

IFNULL(NULLIF(X, '' ), 0)

Attribute X is assumed to be empty if it is an empty String, so after that you can declare as a zero instead of last value. In another case, it would remain its original value.

Anyway, just to give another way to do that.

Changing variable names with Python for loops

You probably want a dict instead of separate variables. For example

d = {}
for i in range(3):
    d["group" + str(i)] = self.getGroup(selected, header+i)

If you insist on actually modifying local variables, you could use the locals function:

for i in range(3):
    locals()["group"+str(i)] = self.getGroup(selected, header+i)

On the other hand, if what you actually want is to modify instance variables of the class you're in, then you can use the setattr function

for i in group(3):
    setattr(self, "group"+str(i), self.getGroup(selected, header+i)

And of course, I'm assuming with all of these examples that you don't just want a list:

groups = [self.getGroup(i,header+i) for i in range(3)]

I get "Http failure response for (unknown url): 0 Unknown Error" instead of actual error message in Angular

My error was that the file was too large (dotnet core seems to have a limit @~25Mb). Setting

maxAllowedContentLength to 4294967295 (max value of uint) in web.config
decorating the controller action with [DisableRequestSizeLimit]
services.Configure(options => { options.MultipartBodyLengthLimit = 4294967295; }); in Startup.cs

solved the problem for me.

sed fails with "unknown option to `s'" error

sdfxcvbn xcb

asdfghgfdsa

How to close an iframe within iframe itself

None of this solution worked for me since I'm in a cross-domain scenario creating a bookmarklet like Pinterest's Pin It.

I've found a bookmarklet template on GitHub https://gist.github.com/kn0ll/1020251 that solved the problem of closing the Iframe sending the command from within it.

Since I can't access any element from parent window within the IFrame, this communication can only be made posting events between the two windows using window.postMessage

All these steps are on the GitHub link:

1- You have to inject a JS file on the parent page.

2- In this file injected on the parent, add a window event listner

    window.addEventListener('message', function(e) {
       var someIframe = window.parent.document.getElementById('iframeid');
       someIframe.parentNode.removeChild(window.parent.document.getElementById('iframeid'));
    });

This listener will handle the close and any other event you wish

3- Inside the Iframe page you send the close command via postMessage:

   $(this).trigger('post-message', [{
                    event: 'unload-bookmarklet'
                }]);

Follow the template on https://gist.github.com/kn0ll/1020251 and you'll be fine!

Hope it helps,

adding text to an existing text element in javascript via DOM

The reason that appendChild is not a function is because you're executing it on the textContent of your p element.

You instead just need to select the paragraph itself, and then append your new text node to that:

_x000D_

var paragraph = document.getElementById("p");_x000D_
var text = document.createTextNode("This just got added");_x000D_
_x000D_
paragraph.appendChild(text);

_x000D_

<p id="p">This is some text</p>

_x000D_

However instead, if you like, you can just modify the text itself (rather than adding a new node):

_x000D_

var paragraph = document.getElementById("p");_x000D_
_x000D_
paragraph.textContent += "This just got added";

_x000D_

<p id="p">This is some text</p>

_x000D_

Getting path relative to the current working directory?

There is also a way to do this with some restrictions. This is the code from the article:

public string RelativePath(string absPath, string relTo)
    {
        string[] absDirs = absPath.Split('\\');
        string[] relDirs = relTo.Split('\\');
        // Get the shortest of the two paths 
        int len = absDirs.Length < relDirs.Length ? absDirs.Length : relDirs.Length;
        // Use to determine where in the loop we exited 
        int lastCommonRoot = -1; int index;
        // Find common root 
        for (index = 0; index < len; index++)
        {
            if (absDirs[index] == relDirs[index])
                lastCommonRoot = index;
            else break;
        }
        // If we didn't find a common prefix then throw 
        if (lastCommonRoot == -1)
        {
            throw new ArgumentException("Paths do not have a common base");
        }
        // Build up the relative path 
        StringBuilder relativePath = new StringBuilder();
        // Add on the .. 
        for (index = lastCommonRoot + 1; index < absDirs.Length; index++)
        {
            if (absDirs[index].Length > 0) relativePath.Append("..\\");
        }
        // Add on the folders 
        for (index = lastCommonRoot + 1; index < relDirs.Length - 1; index++)
        {
            relativePath.Append(relDirs[index] + "\\");
        }
        relativePath.Append(relDirs[relDirs.Length - 1]);
        return relativePath.ToString();
    }

When executing this piece of code:

string path1 = @"C:\Inetpub\wwwroot\Project1\Master\Dev\SubDir1"; 
string path2 = @"C:\Inetpub\wwwroot\Project1\Master\Dev\SubDir2\SubDirIWant";

System.Console.WriteLine (RelativePath(path1, path2));
System.Console.WriteLine (RelativePath(path2, path1));

it prints out:

..\SubDir2\SubDirIWant
..\..\SubDir1

Example: Communication between Activity and Service using Messaging

Look at the LocalService example.

Your Service returns an instance of itself to consumers who call onBind. Then you can directly interact with the service, e.g. registering your own listener interface with the service, so that you can get callbacks.

File path issues in R using Windows ("Hex digits in character string" error)

readClipboard() works directly too. Copy the path into your clipboard

C:\Users\surfcat\Desktop\2006_dissimilarity.csv

Then

readClipboard()

appears as

[1] "C:\\Users\\surfcat\\Desktop\\2006_dissimilarity.csv"

How to align form at the center of the page in html/css

I would just use table and not the form. Its done by using margin.

table {
  margin: 0 auto;
}

also try using something like

table td {
    padding-bottom: 5px;
}

instead of  

and also your input should end with /> e.g:

<input type="password" name="cpwd" />

Angular2 If ngModel is used within a form tag, either the name attribute must be set or the form

It's quite easy for a fix.

For me, we had more than one inputs in the form. We need to isolate the input / line causing error and simply add the name attribute. That fixed the issue for me:

Before:

<form class="example-form">

    <mat-form-field appearance="outline">

      <mat-select placeholder="Select your option" [(ngModel)]="sample.stat"> <!--HERE -->

          <mat-option *ngFor="let option of actions" [value]="option">{{option}</mat-option>
      </mat-select>
    </mat-form-field>

    <mat-form-field appearance="outline">
      <mat-label>Enter number</mat-label>

      <input id="myInput" type="text" placeholder="Enter number" aria-label="Number"
        matInput [formControl]="myFormControl" required [(ngModel)]="number">  <!--HERE -->

    </mat-form-field>

    <mat-checkbox [(ngModel)]="isRight">Check!</mat-checkbox> <!--HERE -->

  </form>

After: i just added the name attribute for select and checkbox and that fixed the issue. As follows:

<mat-select placeholder="Select your option" name="mySelect" 
  [(ngModel)]="sample.stat"> <!--HERE: Observe the "name" attribute -->

<input id="myInput" type="text" placeholder="Enter number" aria-label="Number"
        matInput [formControl]="myFormControl" required [(ngModel)]="number">  <!--HERE -->

<mat-checkbox name="myCheck" [(ngModel)]="isRight">Check!</mat-checkbox> <!--HERE: Observe the "name" attribute -->

As you see added the name attribute. It is not necessary to be given same as your ngModel name. Just providing the name attribute will fix the issue.

How to shut down the computer from C#

Short and sweet. Call an external program:

    using System.Diagnostics;

    void Shutdown()
    {
        Process.Start("shutdown.exe", "-s -t 00");
    }

Note: This calls Windows' Shutdown.exe program, so it'll only work if that program is available. You might have problems on Windows 2000 (where shutdown.exe is only available in the resource kit) or XP Embedded.

How to initialize static variables

If you have control over class loading, you can do static initializing from there.

Example:

class MyClass { public static function static_init() { } }

in your class loader, do the following:

include($path . $klass . PHP_EXT);
if(method_exists($klass, 'static_init')) { $klass::staticInit() }

A more heavy weight solution would be to use an interface with ReflectionClass:

interface StaticInit { public static function staticInit() { } }
class MyClass implements StaticInit { public static function staticInit() { } }

in your class loader, do the following:

$rc = new ReflectionClass($klass);
if(in_array('StaticInit', $rc->getInterfaceNames())) { $klass::staticInit() }

casting Object array to Integer array error

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer;

you try to cast an Array of Object to cast into Array of Integer. You cant do it. This type of downcast is not permitted.

You can make an array of Integer, and after that copy every value of the first array into second array.

How do I make a MySQL database run completely in memory?

It is also possible to place the MySQL data directory in a tmpfs in thus speeding up the database write and read calls. It might not be the most efficient way to do this but sometimes you can't just change the storage engine.

Here is my fstab entry for my MySQL data directory

none            /opt/mysql/server-5.6/data  tmpfs   defaults,size=1000M,uid=999,gid=1000,mode=0700          0       0

You may also want to take a look at the innodb_flush_log_at_trx_commit=2 setting. Maybe this will speedup your MySQL sufficently.

innodb_flush_log_at_trx_commit changes the mysql disk flush behaviour. When set to 2 it will only flush the buffer every second. By default each insert will cause a flush and thus cause more IO load.

How to make an autocomplete TextBox in ASP.NET?

aspx Page Coding

<form id="form1" runat="server">
       <input type="search" name="Search" placeholder="Search for a Product..." list="datalist1"
                    required="">
       <datalist id="datalist1" runat="server">

       </datalist>
 </form>

.cs Page Coding

protected void Page_Load(object sender, EventArgs e)
{
     autocomplete();
}
protected void autocomplete()
{
    Database p = new Database();
    DataSet ds = new DataSet();
    ds = p.sqlcall("select [name] from [stu_reg]");
    int row = ds.Tables[0].Rows.Count;
    string abc="";
    for (int i = 0; i < row;i++ )
        abc = abc + "<option>"+ds.Tables[0].Rows[i][0].ToString()+"</option>";
    datalist1.InnerHtml = abc;
}

Here Database is a File (Database.cs) In Which i have created on method named sqlcall for retriving data from database.

How to compare variables to undefined, if I don’t know whether they exist?

if (document.getElementById('theElement')) // do whatever after this

For undefined things that throw errors, test the property name of the parent object instead of just the variable name - so instead of:

if (blah) ...

do:

if (window.blah) ...

How do I initialize a TypeScript Object with a JSON-Object?

My approach is slightly different. I do not copy properties into new instances, I just change the prototype of existing POJOs (may not work well on older browsers). Each class is responsible for providing a SetPrototypes method to set the prototoypes of any child objects, which in turn provide their own SetPrototypes methods.

(I also use a _Type property to get the class name of unknown objects but that can be ignored here)

class ParentClass
{
    public ID?: Guid;
    public Child?: ChildClass;
    public ListOfChildren?: ChildClass[];

    /**
     * Set the prototypes of all objects in the graph.
     * Used for recursive prototype assignment on a graph via ObjectUtils.SetPrototypeOf.
     * @param pojo Plain object received from API/JSON to be given the class prototype.
     */
    private static SetPrototypes(pojo: ParentClass): void
    {
        ObjectUtils.SetPrototypeOf(pojo.Child, ChildClass);
        ObjectUtils.SetPrototypeOfAll(pojo.ListOfChildren, ChildClass);
    }
}

class ChildClass
{
    public ID?: Guid;
    public GrandChild?: GrandChildClass;

    /**
     * Set the prototypes of all objects in the graph.
     * Used for recursive prototype assignment on a graph via ObjectUtils.SetPrototypeOf.
     * @param pojo Plain object received from API/JSON to be given the class prototype.
     */
    private static SetPrototypes(pojo: ChildClass): void
    {
        ObjectUtils.SetPrototypeOf(pojo.GrandChild, GrandChildClass);
    }
}

Here is ObjectUtils.ts:

/**
 * ClassType lets us specify arguments as class variables.
 * (where ClassType == window[ClassName])
 */
type ClassType = { new(...args: any[]): any; };

/**
 * The name of a class as opposed to the class itself.
 * (where ClassType == window[ClassName])
 */
type ClassName = string & {};

abstract class ObjectUtils
{
/**
 * Set the prototype of an object to the specified class.
 *
 * Does nothing if source or type are null.
 * Throws an exception if type is not a known class type.
 *
 * If type has the SetPrototypes method then that is called on the source
 * to perform recursive prototype assignment on an object graph.
 *
 * SetPrototypes is declared private on types because it should only be called
 * by this method. It does not (and must not) set the prototype of the object
 * itself - only the protoypes of child properties, otherwise it would cause a
 * loop. Thus a public method would be misleading and not useful on its own.
 * 
 * https://stackoverflow.com/questions/9959727/proto-vs-prototype-in-javascript
 */
public static SetPrototypeOf(source: any, type: ClassType | ClassName): any
{
    let classType = (typeof type === "string") ? window[type] : type;

    if (!source || !classType)
    {
        return source;
    }

    // Guard/contract utility
    ExGuard.IsValid(classType.prototype, "type", <any>type);

    if ((<any>Object).setPrototypeOf)
    {
        (<any>Object).setPrototypeOf(source, classType.prototype);
    }
    else if (source.__proto__)
    {
        source.__proto__ = classType.prototype.__proto__;
    }

    if (typeof classType["SetPrototypes"] === "function")
    {
        classType["SetPrototypes"](source);
    }

    return source;
}

/**
 * Set the prototype of a list of objects to the specified class.
 * 
 * Throws an exception if type is not a known class type.
 */
public static SetPrototypeOfAll(source: any[], type: ClassType): void
{
    if (!source)
    {
        return;
    }

    for (var i = 0; i < source.length; i++)
    {
        this.SetPrototypeOf(source[i], type);
    }
}
}

Usage:

let pojo = SomePlainOldJavascriptObjectReceivedViaAjax;

let parentObject = ObjectUtils.SetPrototypeOf(pojo, ParentClass);

// parentObject is now a proper ParentClass instance

How to count lines in a document?

Use wc:

wc -l <filename>

What are alternatives to ExtJS?

Nothing compares to extjs in terms of community size and presence on StackOverflow. Despite previous controversy, Ext JS now has a GPLv3 open source license. Its learning curve is long, but it can be quite rewarding once learned. Ext JS lacks a Material Design theme, and the team has repeatedly refused to release the source code on GitHub. For mobile, one must use the separate Sencha Touch library.

Have in mind also that,

large JavaScript libraries, such as YUI, have been receiving less attention from the community. Many developers today look at large JavaScript libraries as walled gardens they don’t want to be locked into.

-- Announcement of YUI development being ceased

That said, below are a number of Ext JS alternatives currently available.

Leading client widget libraries

Blueprint is a React-based UI toolkit developed by big data analytics company Palantir in TypeScript, and "optimized for building complex data-dense interfaces for desktop applications". Actively developed on GitHub as of May 2019, with comprehensive documentation. Components range from simple (chips, toast, icons) to complex (tree, data table, tag input with autocomplete, date range picker. No accordion or resizer.

Blueprint targets modern browsers (Chrome, Firefox, Safari, IE 11, and Microsoft Edge) and is licensed under a modified Apache license.

Sandbox / demo • GitHub • Docs
Webix - an advanced, easy to learn, mobile-friendly, responsive and rich free&open source JavaScript UI components library. Webix spun off from DHTMLX Touch (a project with 8 years of development behind it - see below) and went on to become a standalone UI components framework. The GPL3 edition allows commercial use and lets non-GPL applications using Webix keep their license, e.g. MIT, via a license exemption for FLOSS. Webix has 55 UI widgets, including trees, grids, treegrids and charts. Funding comes from a commercial edition with some advanced widgets (Pivot, Scheduler, Kanban, org chart etc.). Webix has an extensive list of free and commercial widgets, and integrates with most popular frameworks (React, Vue, Meteor, etc) and UI components.

Skins look modern, and include a Material Design theme. The Touch theme also looks quite Material Design-ish. See also the Skin Builder.

Minimal GitHub presence, but includes the library code, and the documentation (which still needs major improvements). Webix suffers from a having a small team and a lack of marketing. However, they have been responsive to user feedback, both on GitHub and on their forum.

The library was lean (128Kb gzip+minified for all 55 widgets as of ~2015), faster than ExtJS, dojo and others, and the design is pleasant-looking. The current version of Webix (v6, as of Nov 2018) got heavier (400 - 676kB minified but NOT gzipped).

The demos on Webix.com look and function great. The developer, XB Software, uses Webix in solutions they build for paying customers, so there's likely a good, funded future ahead of it.

Webix aims for backwards compatibility down to IE8, and as a result carries some technical debt.

Wikipedia • GitHub • Playground/sandbox • Admin dashboard demo • Demos • Widget samples
react-md - MIT-licensed Material Design UI components library for React. Responsive, accessible. Implements components from simple (buttons, cards) to complex (sortable tables, autocomplete, tags input, calendars). One lead author, ~1900 GitHub stars.
kendo - jQuery-based UI toolkit with 40+ basic open-source widgets, plus commercial professional widgets (grids, trees, charts etc.). Responsive&mobile support. Works with Bootstrap and AngularJS. Modern, with Material Design themes. The documentation is available on GitHub, which has enabled numerous contributions from users (4500+ commits, 500+ PRs as of Jan 2015).

Well-supported commercially, claiming millions of developers, and part of a large family of developer tools. Telerik has received many accolades, is a multi-national company (Bulgaria, US), was acquired by Progress Software, and is a thought leader.

A Kendo UI Professional developer license costs $700 and posting access to most forums is conditioned upon having a license or being in the trial period.

[Wikipedia] • GitHub/Telerik • Demos • Playground • Tools
OpenUI5 - jQuery-based UI framework with 180 widgets, Apache 2.0-licensed and fully-open sourced and funded by German software giant SAP SE.

The community is much larger than that of Webix, SAP is hiring developers to grow OpenUI5, and they presented OpenUI5 at OSCON 2014.

The desktop themes are rather lackluster, but the Fiori design for web and mobile looks clean and neat.

Wikipedia • GitHub • Mobile-first controls demos • Desktop controls demos • SO
DHTMLX - JavaScript library for building rich Web and Mobile apps. Looks most like ExtJS - check the demos. Has been developed since 2005 but still looks modern. All components except TreeGrid are available under GPLv2 but advanced features for many components are only available in the commercial PRO edition - see for example the tree. Claims to be used by many Fortune 500 companies.

Minimal presence on GitHub (the main library code is missing) and StackOverflow but active forum. The documentation is not available on GitHub, which makes it difficult to improve by the community.
Polymer, a Web Components polyfill, plus Polymer Paper, Google's implementation of the Material design. Aimed at web and mobile apps. Doesn't have advanced widgets like trees or even grids but the controls it provides are mobile-first and responsive. Used by many big players, e.g. IBM or USA Today.
Ant Design claims it is "a design language for background applications", influenced by "nature" and helping designers "create low-entropy atmosphere for developer team". That's probably a poor translation from Chinese for "UI components for enterprise web applications". It's a React UI library written in TypeScript, with many components, from simple (buttons, cards) to advanced (autocomplete, calendar, tag input, table).

The project was born in China, is popular with Chinese companies, and parts of the documentation are available only in Chinese. Quite popular on GitHub, yet it makes the mistake of splitting the community into Chinese and English chat rooms. The design looks Material-ish, but fonts are small and the information looks lost in a see of whitespace.
PrimeUI - collection of 45+ rich widgets based on jQuery UI. Apache 2.0 license. Small GitHub community. 35 premium themes available.
qooxdoo - "a universal JavaScript framework with a coherent set of individual components", developed and funded by German hosting provider 1&1 (see the contributors, one of the world's largest hosting companies. GPL/EPL (a business-friendly license).

Mobile themes look modern but desktop themes look old (gradients).

Wikipedia • GitHub • Web/Mobile/Desktop demos • Widgets Demo browser • Widget browser • SO • Playground • Community
jQuery UI - easy to pick up; looks a bit dated; lacks advanced widgets. Of course, you can combine it with independent widgets for particular needs, e.g. trees or other UI components, but the same can be said for any other framework.
angular + Angular UI. While Angular is backed by Google, it's being radically revamped in the upcoming 2.0 version, and "users will need to get to grips with a new kind of architecture. It's also been confirmed that there will be no migration path from Angular 1.X to 2.0". Moreover, the consensus seems to be that Angular 2 won't really be ready for use until a year or two from now. Angular UI has relatively few widgets (no trees, for example).
DojoToolkit and their powerful Dijit set of widgets. Completely open-sourced and actively developed on GitHub, but development is now (Nov 2018) focused on the new dojo.io framework, which has very few basic widgets. BSD/AFL license. Development started in 2004 and the Dojo Foundation is being sponsored by IBM, Google, and others - see Wikipedia. 7500 questions here on SO.

Themes look desktop-oriented and dated - see the theme tester in dijit. The official theme previewer is broken and only shows "Claro". A Bootstrap theme exists, which looks a lot like Bootstrap, but doesn't use Bootstrap classes. In Jan 2015, I started a thread on building a Material Design theme for Dojo, which got quite popular within the first hours. However, there are questions regarding building that theme for the current Dojo 1.10 vs. the next Dojo 2.0. The response to that thread shows an active and wide community, covering many time zones.

Unfortunately, Dojo has fallen out of popularity and fewer companies appear to use it, despite having (had?) a strong foothold in the enterprise world. In 2009-2012, its learning curve was steep and the documentation needed improvements; while the documentation has substantially improved, it's unclear how easy it is to pick up Dojo nowadays.

With a Material Design theme, Dojo (2.0?) might be the killer UI components framework.

Wikipedia • GitHub • Themes • Demos • Desktop widgets • SO
Enyo - front-end library aimed at mobile and TV apps (e.g. large touch-friendly controls). Developed by LG Electronix and Apache-licensed on GitHub.
The radical Cappuccino - Objective-J (a superset of JavaScript) instead of HTML+CSS+DOM
Mochaui, MooTools UI Library User Interface Library. <300 GitHub stars.
CrossUI - cross-browser JS framework to develop and package the exactly same code and UI into Web Apps, Native Desktop Apps (Windows, OS X, Linux) and Mobile Apps (iOS, Android, Windows Phone, BlackBerry). Open sourced LGPL3. Featured RAD tool (form builder etc.). The UI looks desktop-, not web-oriented. Actively developed, small community. No presence on GitHub.
ZinoUI - simple widgets. The DataTable, for instance, doesn't even support sorting.
Wijmo - good-looking commercial widgets, with old (jQuery UI) widgets open-sourced on GitHub (their development stopped in 2013). Developed by ComponentOne, a division of GrapeCity. See Wijmo Complete vs. Open.
CxJS - commercial JS framework based on React, Babel and webpack offering form elements, form validation, advanced grid control, navigational elements, tooltips, overlays, charts, routing, layout support, themes, culture dependent formatting and more.

Widgets - Demo Apps - Examples - GitHub

Full-stack frameworks

SproutCore - developed by Apple for web applications with native performance, handling large data sets on the client. Powers iCloud.com. Not intended for widgets.
Wakanda: aimed at business/enterprise web apps - see What is Wakanda?. Architecture:
- Wakanda Server (server-side JavaScript (custom engine) + open-source NoSQL database)
- desktop IDE and WYSIWYG editor for tables, forms, reports
- Wakanda Application Framework (datasource layer + browser-based interface widgets) that helps with browser and device compatibility across desktop and mobile
  
  Wakanda is highly integrated, includes a ton of features out of the box, but has a very small GitHub community and SO presence.
Servoy - "a cross platform frontend development and deployment environment for SQL databases". Boasts a "full WYSIWIG (What You See Is What You Get) UI designer for HTML5 with built-in data-binding to back-end services", responsive design, support for HTML6 Web Components, Websockets and mobile platforms. Written in Java and generates JavaScript code using various JavaBeans.
SmartClient/SmartGWT - mobile and cross-browser HTML5 UI components combined with a Java server. Aimed at building powerful business apps - see demos.
Vaadin - full-stack Java/GWT + JavaScript/HTML3 web app framework
Backbase - portal software
Shiny - front-end library on top R, with visualization, layout and control widgets
ZKOSS: Java+jQuery+Bootstrap framework for building enterprise web and mobile apps.

CSS libraries + minimal widgets

These libraries don't implement complex widgets such as tables with sorting/filtering, autocompletes, or trees.

Bootstrap
Foundation for Apps - responsive front-end framework on top of AngularJS; more of a grid/layout/navigation library
UI Kit - similar to Bootstrap, with fewer widgets, but with official off-canvas.

Libraries using HTML Canvas

Using the canvas elements allows for complete control over the UI, and great cross-browser compatibility, but comes at the cost of missing native browser functionality, e.g. page search via Ctrl/Cmd+F.

Zebra - demos

No longer developed as of Dec 2014

Yahoo! User Interface - YUI, launched in 2005, but no longer maintained by the core contributors - see the announcement, which highlights reasons why large UI widget libraries are perceived as walled gardens that developers don't want to be locked into.
echo3, GitHub. Supports writing either server-side Java applications that don't require developer knowledge of HTML, HTTP, or JavaScript, or client-side JavaScript-based applications do not require a server, but can communicate with one via AJAX. Last update: July 2013.
ampleSDK
Simpler widgets livepipe.net
JxLib
rialto
Simple UI kit
Prototype-ui

Other lists

Best of JS - component toolkits
Wikipedia's Comparison of JavaScript frameworks
Wikipedia's list of GUI-related JavaScript libraries
jqueryuiwidgets.com - detailed jQuery widgets feature comparison

Try reinstalling `node-sass` on node 0.12?

Downgrading Node to 0.10.36 should do it per this thread on the node-sass github page: https://github.com/sass/node-sass/issues/490#issuecomment-70388754

If you have NVM you can just:

nvm install 0.10

If you don't, you can find NVM and instructions here: https://www.npmjs.com/package/nvm

How to specify a local file within html using the file: scheme?

The 'file' protocol is not a network protocol. Therefore file://192.168.1.57/~User/2ndFile.html simply does not make much sense.

Question is how you load the first file. Is that really done using a web server? Does not really sound like. If it is, then why not use the same protocol, most likely http? You cannot expect to simply switch the protocol and use two different protocols the same way...

I suspect the first file is really loaded using the apache server at all, but simply by opening the file? href="2ndFile.html" simply works because it uses a "relative url". This makes the browser use the same protocol and path as where he got the first (current) file from.

How to use OpenFileDialog to select a folder?

Sounds to me like you're just after the FolderBrowserDialog.

How to convert FormData (HTML5 object) to JSON

If you need support for serializing nested fields, similar to how PHP handles form fields, you can use the following function

_x000D_

function update(data, keys, value) {_x000D_
  if (keys.length === 0) {_x000D_
    // Leaf node_x000D_
    return value;_x000D_
  }_x000D_
_x000D_
  let key = keys.shift();_x000D_
  if (!key) {_x000D_
    data = data || [];_x000D_
    if (Array.isArray(data)) {_x000D_
      key = data.length;_x000D_
    }_x000D_
  }_x000D_
_x000D_
  // Try converting key to a numeric value_x000D_
  let index = +key;_x000D_
  if (!isNaN(index)) {_x000D_
    // We have a numeric index, make data a numeric array_x000D_
    // This will not work if this is a associative array _x000D_
    // with numeric keys_x000D_
    data = data || [];_x000D_
    key = index;_x000D_
  }_x000D_
  _x000D_
  // If none of the above matched, we have an associative array_x000D_
  data = data || {};_x000D_
_x000D_
  let val = update(data[key], keys, value);_x000D_
  data[key] = val;_x000D_
_x000D_
  return data;_x000D_
}_x000D_
_x000D_
function serializeForm(form) {_x000D_
  return Array.from((new FormData(form)).entries())_x000D_
    .reduce((data, [field, value]) => {_x000D_
      let [_, prefix, keys] = field.match(/^([^\[]+)((?:\[[^\]]*\])*)/);_x000D_
_x000D_
      if (keys) {_x000D_
        keys = Array.from(keys.matchAll(/\[([^\]]*)\]/g), m => m[1]);_x000D_
        value = update(data[prefix], keys, value);_x000D_
      }_x000D_
      data[prefix] = value;_x000D_
      return data;_x000D_
    }, {});_x000D_
}_x000D_
_x000D_
document.getElementById('output').textContent = JSON.stringify(serializeForm(document.getElementById('form')), null, 2);

_x000D_

<form id="form">_x000D_
  <input name="field1" value="Field 1">_x000D_
  <input name="field2[]" value="Field 21">_x000D_
  <input name="field2[]" value="Field 22">_x000D_
  <input name="field3[a]" value="Field 3a">_x000D_
  <input name="field3[b]" value="Field 3b">_x000D_
  <input name="field3[c]" value="Field 3c">_x000D_
  <input name="field4[x][a]" value="Field xa">_x000D_
  <input name="field4[x][b]" value="Field xb">_x000D_
  <input name="field4[x][c]" value="Field xc">_x000D_
  <input name="field4[y][a]" value="Field ya">_x000D_
  <input name="field5[z][0]" value="Field z0">_x000D_
  <input name="field5[z][]" value="Field z1">_x000D_
  <input name="field6.z" value="Field 6Z0">_x000D_
  <input name="field6.z" value="Field 6Z1">_x000D_
</form>_x000D_
_x000D_
<h2>Output</h2>_x000D_
<pre id="output">_x000D_
</pre>

_x000D_

How to stop tracking and ignore changes to a file in Git?

The accepted answer still did not work for me

I used

git rm -r --cached .

git add .

git commit -m "fixing .gitignore"

Found the answer from here

How to extract or unpack an .ab file (Android Backup file)

I have had to unpack a .ab-file, too and found this post while looking for an answer. My suggested solution is Android Backup Extractor, a free Java tool for Windows, Linux and Mac OS.

Make sure to take a look at the README, if you encounter a problem. You might have to download further files, if your .ab-file is password-protected.

Usage:

java -jar abe.jar [-debug] [-useenv=yourenv] unpack <backup.ab> <backup.tar> [password]

Example:

Let's say, you've got a file test.ab, which is not password-protected, you're using Windows and want the resulting .tar-Archive to be called test.tar. Then your command should be:

java.exe -jar abe.jar unpack test.ab test.tar ""

Xcode - Warning: Implicit declaration of function is invalid in C99

should call the function properly; like- Fibonacci:input

Find files in a folder using Java

You give the name of your file, the path of the directory to search, and let it make the job.

private static String getPath(String drl, String whereIAm) {
    File dir = new File(whereIAm); //StaticMethods.currentPath() + "\\src\\main\\resources\\" + 
    for(File e : dir.listFiles()) {
        if(e.isFile() && e.getName().equals(drl)) {return e.getPath();}
        if(e.isDirectory()) {
            String idiot = getPath(drl, e.getPath());
            if(idiot != null) {return idiot;}
        }
    }
    return null;
}

How does Google reCAPTCHA v2 work behind the scenes?

A new paper has been released with several tests against reCAPTCHA:

https://www.blackhat.com/docs/asia-16/materials/asia-16-Sivakorn-Im-Not-a-Human-Breaking-the-Google-reCAPTCHA-wp.pdf

Some highlights:

By keeping a cookie active for +9 days (by browsing sites with Google resources), you can then pass reCAPTCHA by only clicking the checkbox;
There are no restrictions based on requests per IP;
The browser's user agent must be real, and Google run tests against your environment to ensure it matches the user agent;
Google tests if the browser can render a Canvas;
Screen resolution and mouse events don't affect the results;

Google has already fixed the cookie vulnerability and is probably restricting some behaviors based on IPs.

Another interesting finding is that Google runs a VM in JavaScript that obfuscates much of reCAPTCHA code and behavior. This VM is known as botguard and is used to protect other services besides reCAPTCHA:

https://github.com/neuroradiology/InsideReCaptcha

UPDATE 2017

A recent paper (from August) was published on WOOT 2017 achieving 85% accuracy in solving noCAPTCHA reCAPTCHA audio challenges:

http://uncaptcha.cs.umd.edu/papers/uncaptcha_woot17.pdf

UPDATE 2018

Google is introducing reCAPTCHA v3, which looks like a "human score prediction engine" that is calibrated per website. It can be installed into different pages of a website (working like a Google Analytics script) to help reCAPTCHA and the website owner to understand the behaviour of humans vs. bots before filling a reCAPTCHA.

https://www.google.com/recaptcha/intro/v3beta.html

React: how to update state.item[1] in state using setState?

First get the item you want, change what you want on that object and set it back on the state. The way you're using state by only passing an object in getInitialState would be way easier if you'd use a keyed object.

handleChange: function (e) {
   item = this.state.items[1];
   item.name = 'newName';
   items[1] = item;

   this.setState({items: items});
}

Error: The 'brew link' step did not complete successfully

I completely uninstalled brew and started again, only to find the same problem again.

Brew appears to work by symlinking the required binaries into your system where other installation methods would typically copy the files.

I found an existing set of node libraries here:

/usr/local/include/node

After some head scratching I remembered installing node at the date against this old version and it hadn't been via brew.

I manually deleted this entire folder and successfully linked npm.

This would explain why using brew uninstall or even uninstall brew itself had no effect.

The highest ranked answer puts this very simply, but I thought I'd add my observations about why it's necessary.

I'm guessing a bunch of issues with other brew packages might be caused by old non-brew instances of packages being in the way.

"Unicode Error "unicodeescape" codec can't decode bytes... Cannot open text files in Python 3

path = pd.read_csv(**'C:\Users\mravi\Desktop\filename'**)

The error is because of the path that is mentioned

Add 'r' before the path

path = pd.read_csv(**r'C:\Users\mravi\Desktop\filename'**)

This would work fine.

How to access parent scope from within a custom directive with own scope in AngularJS?

Having tried everything, I finally came up with a solution.

Just place the following in your template:

{{currentDirective.attr = parentDirective.attr; ''}}

It just writes the parent scope attribute/variable you want to access to the current scope.

Also notice the ; '' at the end of the statement, it's to make sure there's no output in your template. (Angular evaluates every statement, but only outputs the last one).

It's a bit hacky, but after a few hours of trial and error, it does the job.

PHP/MySQL insert row then get 'id'

$link = mysqli_connect('127.0.0.1', 'my_user', 'my_pass', 'my_db');
mysqli_query($link, "INSERT INTO mytable (1, 2, 3, 'blah')");
$id = mysqli_insert_id($link);

See mysqli_insert_id().

Whatever you do, don't insert and then do a "SELECT MAX(id) FROM mytable". Like you say, it's a race condition and there's no need. mysqli_insert_id() already has this functionality.

Convert double to BigDecimal and set BigDecimal Precision

The String.format syntax helps us convert doubles and BigDecimals to strings of whatever precision.

This java code:

double dennis = 0.00000008880000d;
System.out.println(dennis);
System.out.println(String.format("%.7f", dennis));
System.out.println(String.format("%.9f", new BigDecimal(dennis)));
System.out.println(String.format("%.19f", new BigDecimal(dennis)));

Prints:

8.88E-8
0.0000001
0.000000089
0.0000000888000000000

How to make child divs always fit inside parent div?

you could use inherit

#one {width:500px;height:300px;}
#two {width:inherit;height:inherit;}
#three {width:inherit;height:inherit;}

How to check if an integer is in a given range?

Google's Java Library Guava also implements Range:

import com.google.common.collect.Range;

Range<Integer> open = Range.open(1, 5);
System.out.println(open.contains(1)); // false
System.out.println(open.contains(3)); // true
System.out.println(open.contains(5)); // false

Range<Integer> closed = Range.closed(1, 5);
System.out.println(closed.contains(1)); // true
System.out.println(closed.contains(3)); // true
System.out.println(closed.contains(5)); // true

Range<Integer> openClosed = Range.openClosed(1, 5);
System.out.println(openClosed.contains(1)); // false
System.out.println(openClosed.contains(3)); // true
System.out.println(openClosed.contains(5)); // true

Convert Uppercase Letter to Lowercase and First Uppercase in Sentence using CSS

There is no sentence caps option in CSS. The other answers suggesting text-transform: capitalize are incorrect as that option capitalizes each word.

Here's a crude way to accomplish it if you only want the first letter of each element to be uppercase, but it's definitely nowhere near actual sentence caps:

p {
    text-transform: lowercase;
}

p:first-letter {
    text-transform: uppercase;
}

<p>THIS IS AN EXAMPLE SENTENCE.</p>
<p>THIS IS ANOTHER EXAMPLE SENTENCE.
   AND THIS IS ANOTHER, BUT IT WILL BE ENTIRELY LOWERCASE.</p>

printf not printing on console

You could try writing to stderr, rather than stdout.

fprintf(stderr, "Hello, please enter your age\n");

You should also have a look at this relevant thread.

Will the IE9 WebBrowser Control Support all of IE9's features, including SVG?

I totally agree with the solution provided, but I think a little clarification is important I think, might be necessary.

For each process (read also: vshost.exe, yourWinformApplication.exe.svchost, or the name of your application.exe) that will need to add a DWORD with the value provided, in my case I leave 9000 (in decimal) in application name and running smoothly and error-free script.

the most common mistake is to believe that it is necessary to add "contoso.exe" AS IS and think it all work!

Setting Camera Parameters in OpenCV/Python

To avoid using integer values to identify the VideoCapture properties, one can use, e.g., cv2.cv.CV_CAP_PROP_FPS in OpenCV 2.4 and cv2.CAP_PROP_FPS in OpenCV 3.0. (See also Stefan's comment below.)

Here a utility function that works for both OpenCV 2.4 and 3.0:

# returns OpenCV VideoCapture property id given, e.g., "FPS"
def capPropId(prop):
  return getattr(cv2 if OPCV3 else cv2.cv,
    ("" if OPCV3 else "CV_") + "CAP_PROP_" + prop)

OPCV3 is set earlier in my utilities code like this:

from pkg_resources import parse_version
OPCV3 = parse_version(cv2.__version__) >= parse_version('3')

How to use Git?

I would suggest this three for beginners

http://git-scm.com/docs/gittutorial

https://tutsplus.com/course/git-essentials/ (video tutorial)

http://lifehacker.com/5983680/how-the-heck-do-i-use-github (gihub)

How to "fadeOut" & "remove" a div in jQuery?

Use

.fadeOut(360).delay(400).remove();

Does 'position: absolute' conflict with Flexbox?

you have forgotten width of parent

_x000D_

.parent {_x000D_
   display: flex;_x000D_
   justify-content: center;_x000D_
   position: absolute;_x000D_
   width:100%_x000D_
 }

_x000D_

<div class="parent">_x000D_
  <div class="child">text</div>_x000D_
</div>

_x000D_

How ViewBag in ASP.NET MVC works

ViewBag is of type dynamic. More, you cannot do ViewBag["Foo"]. You will get exception - Cannot apply indexing with [] to an expression of type 'System.Dynamic.DynamicObject'.

Internal implementation of ViewBag actually stores Foo into ViewData["Foo"] (type of ViewDataDictionary), so those 2 are interchangeable. ViewData["Foo"] and ViewBag.Foo.

And scope. ViewBag and ViewData are ment to pass data between Controller's Actions and View it renders.

How do I test axios in Jest?

For those looking to use axios-mock-adapter in place of the mockfetch example in the Redux documentation for async testing, I successfully used the following:

File actions.test.js:

describe('SignInUser', () => {
  var history = {
    push: function(str) {
        expect(str).toEqual('/feed');
    }
  }

  it('Dispatches authorization', () => {
    let mock = new MockAdapter(axios);
    mock.onPost(`${ROOT_URL}/auth/signin`, {
        email: '[email protected]',
        password: 'test'
    }).reply(200, {token: 'testToken' });

    const expectedActions = [ { type: types.AUTH_USER } ];
    const store = mockStore({ auth: [] });

    return store.dispatch(actions.signInUser({
        email: '[email protected]',
        password: 'test',
      }, history)).then(() => {
        expect(store.getActions()).toEqual(expectedActions);
  });

});

In order to test a successful case for signInUser in file actions/index.js:

export const signInUser = ({ email, password }, history) => async dispatch => {
  const res = await axios.post(`${ROOT_URL}/auth/signin`, { email, password })
    .catch(({ response: { data } }) => {
        ...
  });

  if (res) {
    dispatch({ type: AUTH_USER });                 // Test verified this
    localStorage.setItem('token', res.data.token); // Test mocked this
    history.push('/feed');                         // Test mocked this
  }
}

Given that this is being done with jest, the localstorage call had to be mocked. This was in file src/setupTests.js:

const localStorageMock = {
  removeItem: jest.fn(),
  getItem: jest.fn(),
  setItem: jest.fn(),
  clear: jest.fn()
};
global.localStorage = localStorageMock;

How to select option in drop down protractorjs e2e tests

To access a specific option you need to provide the nth-child() selector:

ptor.findElement(protractor.By.css('select option:nth-child(1)')).click();

Best practice to run Linux service as a different user

on a CENTOS (Red Hat) virtual machine for svn server: edited /etc/init.d/svnserver to change the pid to something that svn can write:

pidfile=${PIDFILE-/home/svn/run/svnserve.pid}

and added option --user=svn:

daemon --pidfile=${pidfile} --user=svn $exec $args

The original pidfile was /var/run/svnserve.pid. The daemon did not start becaseu only root could write there.

 These all work:
/etc/init.d/svnserve start
/etc/init.d/svnserve stop
/etc/init.d/svnserve restart

How does an SSL certificate chain bundle work?

You need to use the openssl pkcs12 -export -chain -in server.crt -CAfile ...

See https://www.openssl.org/docs/apps/pkcs12.html

How to change app default theme to a different app theme?

Or try to check your mainActivity.xml you make sure that this one
xmlns:app="http://schemas.android.com/apk/res-auto"hereis included

Uploading Laravel Project onto Web Server

All of your Laravel files should be in one location. Laravel is exposing its public folder to server. That folder represents some kind of front-controller to whole application. Depending on you server configuration, you have to point your server path to that folder. As I can see there is www site on your picture. www is default root directory on Unix/Linux machines. It is best to take a look inside you server configuration and search for root directory location. As you can see, Laravel has already file called .htaccess, with some ready Apache configuration.

How do I use extern to share variables between source files?

GCC ELF Linux implementation

Other answers have covered the language usage side of view, so now let's have a look at how it is implemented in this implementation.

main.c

#include <stdio.h>

int not_extern_int = 1;
extern int extern_int;

void main() {
    printf("%d\n", not_extern_int);
    printf("%d\n", extern_int);
}

Compile and decompile:

gcc -c main.c
readelf -s main.o

Output contains:

Num:    Value          Size Type    Bind   Vis      Ndx Name
 9: 0000000000000000     4 OBJECT  GLOBAL DEFAULT    3 not_extern_int
12: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND extern_int

The System V ABI Update ELF spec "Symbol Table" chapter explains:

SHN_UNDEF This section table index means the symbol is undefined. When the link editor combines this object file with another that defines the indicated symbol, this file's references to the symbol will be linked to the actual definition.

which is basically the behavior the C standard gives to extern variables.

From now on, it is the job of the linker to make the final program, but the extern information has already been extracted from the source code into the object file.

Tested on GCC 4.8.

C++17 inline variables

In C++17, you might want to use inline variables instead of extern ones, as they are simple to use (can be defined just once on header) and more powerful (support constexpr). See: What does 'const static' mean in C and C++?

Google OAuth 2 authorization - Error: redirect_uri_mismatch

beware of the extra / at the end of the url http://localhost:8000 is different from http://localhost:8000/

Why Is `Export Default Const` invalid?

To me this is just one of many idiosyncracies (emphasis on the idio(t) ) of typescript that causes people to pull out their hair and curse the developers. Maybe they could work on coming up with more understandable error messages.

How can I convert a Timestamp into either Date or DateTime object?

java.time

Modern answer: use java.time, the modern Java date and time API, for your date and time work. Back in 2011 it was right to use the Timestamp class, but since JDBC 4.2 it is no longer advised.

For your work we need a time zone and a couple of formatters. We may as well declare them static:

static ZoneId zone = ZoneId.of("America/Marigot");
static DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("MM/dd/uuuu");
static DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("HH:mm xx");

Now the code could be for example:

    while(resultSet.next()) {
        ZonedDateTime dtStart = resultSet.getObject("dtStart", OffsetDateTime.class)
                 .atZoneSameInstant(zone);

        // I would like to then have the date and time
        // converted into the formats mentioned...
        String dateFormatted = dtStart.format(dateFormatter);
        String timeFormatted = dtStart.format(timeFormatter);
        System.out.format("Date: %s; time: %s%n", dateFormatted, timeFormatted);
    }

Example output (using the time your question was asked):

Date: 09/20/2011; time: 18:13 -0400

In your database timestamp with time zone is recommended for timestamps. If this is what you’ve got, retrieve an OffsetDateTime as I am doing in the code. I am also converting the retrieved value to the user’s time zone before formatting date and time separately. As time zone I supplied America/Marigot as an example, please supply your own. You may also leave out the time zone conversion if you don’t want any, of course.

If the datatype in SQL is a mere timestamp without time zone, retrieve a LocalDateTime instead. For example:

        ZonedDateTime dtStart = resultSet.getObject("dtStart", LocalDateTime.class)
                 .atZone(zone);

No matter the details I trust you to do similarly for dtEnd.

I wasn’t sure what you meant by the xx in HH:MM xx. I just left it in the format pattern string, which yields the UTC offset in hours and minutes without colon.

Link: Oracle tutorial: Date Time explaining how to use java.time.

How do I check in python if an element of a list is empty?

If you want to know if list element at index i is set or not, you can simply check the following:

if len(l)<=i:
    print ("empty")

If you are looking for something like what is a NULL-Pointer or a NULL-Reference in other languages, Python offers you None. That is you can write:

l[0] = None # here, list element at index 0 has to be set already
l.append(None) # here the list can be empty before
# checking
if l[i] == None:
    print ("list has actually an element at position i, which is None")

Error while sending QUERY packet

You may also have this error if the variable wait_timeout is too low.

If so, you may set it higher like that:

SET GLOBAL wait_timeout=10;

This was the solution for the same error in my case.

Does a valid XML file require an XML declaration?

In XML 1.0, the XML Declaration is optional. See section 2.8 of the XML 1.0 Recommendation, where it says it "should" be used -- which means it is recommended, but not mandatory. In XML 1.1, however, the declaration is mandatory. See section 2.8 of the XML 1.1 Recommendation, where it says "MUST" be used. It even goes on to state that if the declaration is absent, that automatically implies the document is an XML 1.0 document.

Note that in an XML Declaration the encoding and standalone are both optional. Only the version is mandatory. Also, these are not attributes, so if they are present they must be in that order: version, followed by any encoding, followed by any standalone.

<?xml version="1.0"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" standalone="yes"?>
<?xml version="1.0" encoding="UTF-16" standalone="yes"?>

If you don't specify the encoding in this way, XML parsers try to guess what encoding is being used. The XML 1.0 Recommendation describes one possible way character encoding can be autodetected. In practice, this is not much of a problem if the input is encoded as UTF-8, UTF-16 or US-ASCII. Autodetection doesn't work when it encounters 8-bit encodings that use characters outside the US-ASCII range (e.g. ISO 8859-1) -- avoid creating these if you can.

The standalone indicates whether the XML document can be correctly processed without the DTD or not. People rarely use it. These days, it is a bad to design an XML format that is missing information without its DTD.

Update:

A "prolog error/invalid utf-8 encoding" error indicates that the actual data the parser found inside the file did not match the encoding that the XML declaration says it is. Or in some cases the data inside the file did not match the autodetected encoding.

Since your file contains a byte-order-mark (BOM) it should be in UTF-16 encoding. I suspect that your declaration says <?xml version="1.0" encoding="UTF-8"?> which is obviously incorrect when the file has been changed into UTF-16 by NotePad. The simple solution is to remove the encoding and simply say <?xml version="1.0"?>. You could also edit it to say encoding="UTF-16" but that would be wrong for the original file (which wasn't in UTF-16) or if the file somehow gets changed back to UTF-8 or some other encoding.

Don't bother trying to remove the BOM -- that's not the cause of the problem. Using NotePad or WordPad to edit XML is the real problem!

VBA array sort function?

Dim arr As Object
Dim InputArray

'Creating a array list
Set arr = CreateObject("System.Collections.ArrayList")

'String
InputArray = Array("d", "c", "b", "a", "f", "e", "g")

'number
'InputArray = Array(6, 5, 3, 4, 2, 1)

' adding the elements in the array to array_list
For Each element In InputArray
    arr.Add element
Next

'sorting happens
arr.Sort

'Converting ArrayList to an array
'so now a sorted array of elements is stored in the array sorted_array.

sorted_array = arr.toarray

Unable to import a module that is definitely installed

It's the python path problem.

In my case, I have python installed in:

/Library/Frameworks/Python.framework/Versions/2.6/bin/python,

and there is no site-packages directory within the python2.6.

The package(SOAPpy) I installed by pip is located

/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/

And site-package is not in the python path, all I did is add site-packages to PYTHONPATH permanently.

Open up Terminal
Type open .bash_profile
In the text file that pops up, add this line at the end:

export PYTHONPATH=$PYTHONPATH:/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/
Save the file, restart the Terminal, and you're done

Generating matplotlib graphs without a running X server

@Neil's answer is one (perfectly valid!) way of doing it, but you can also simply call matplotlib.use('Agg') before importing matplotlib.pyplot, and then continue as normal.

E.g.

import matplotlib as mpl
mpl.use('Agg')
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(range(10))
fig.savefig('temp.png')

You don't have to use the Agg backend, as well. The pdf, ps, svg, agg, cairo, and gdk backends can all be used without an X-server. However, only the Agg backend will be built by default (I think?), so there's a good chance that the other backends may not be enabled on your particular install.

Alternately, you can just set the backend parameter in your .matplotlibrc file to automatically have matplotlib.pyplot use the given renderer.

How to make a div 100% height of the browser window

Actually what worked for me best was using the vh property.

In my React application I wanted the div to match the page high even when resized. I tried height: 100%;, overflow-y: auto;, but none of them worked when setting height:(your percent)vh; it worked as intended.

Note: if you are using padding, round corners, etc., make sure to subtract those values from your vh property percent or it adds extra height and make scroll bars appear. Here's my sample:

.frame {
  background-color: rgb(33, 2, 211);
  height: 96vh;
  padding: 1% 3% 2% 3%;
  border: 1px solid rgb(212, 248, 203);
  border-radius: 10px;
  display: grid;
  grid-gap: 5px;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: 50px 100px minmax(50px, 1fr) minmax(50px, 1fr) minmax(50px, 1fr);
}

Embed Youtube video inside an Android app

How it looks:

Best solution to my case. I need video fit web view size. Use embed youtube link with your video id. Example:

WebView youtubeWebView; //todo find or bind web view
String myVideoYoutubeId = "-bvXmLR3Ozc";

outubeWebView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return false;
            }
        });

WebSettings webSettings = youtubeWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setUseWideViewPort(true);

youtubeWebView.loadUrl("https://www.youtube.com/embed/" + myVideoYoutubeId);

Web view xml code

<WebView
        android:id="@+id/youtube_web_view"
        android:layout_width="match_parent"
        android:layout_height="200dp"/>

how to put focus on TextBox when the form load?

In jquery set focus

$(function() {
  $("#txtBox1").focus();
});

or in Javascript you can do

window.onload = function() {
  document.getElementById("txtBox1").focus();
};

Raw_Input() Is Not Defined

For Python 3.x, use input(). For Python 2.x, use raw_input(). Don't forget you can add a prompt string in your input() call to create one less print statement. input("GUESS THAT NUMBER!").

How do I specify "close existing connections" in sql script

You can disconnect everyone and roll back their transactions with:

alter database [MyDatbase] set single_user with rollback immediate

After that, you can safely drop the database :)

What is the difference between Subject and BehaviorSubject?

A BehaviorSubject holds one value. When it is subscribed it emits the value immediately. A Subject doesn't hold a value.

Subject example (with RxJS 5 API):

const subject = new Rx.Subject();
subject.next(1);
subject.subscribe(x => console.log(x));

Console output will be empty

BehaviorSubject example:

const subject = new Rx.BehaviorSubject(0);
subject.next(1);
subject.subscribe(x => console.log(x));

Console output: 1

In addition:

BehaviorSubject should be created with an initial value: new Rx.BehaviorSubject(1)
Consider ReplaySubject if you want the subject to hold more than one value

How do you set your pythonpath in an already-created virtualenv?

It's already answered here -> Is my virtual environment (python) causing my PYTHONPATH to break?

UNIX/LINUX

Add "export PYTHONPATH=/usr/local/lib/python2.0" this to ~/.bashrc file and source it by typing "source ~/.bashrc" OR ". ~/.bashrc".

WINDOWS XP

1) Go to the Control panel 2) Double click System 3) Go to the Advanced tab 4) Click on Environment Variables

In the System Variables window, check if you have a variable named PYTHONPATH. If you have one already, check that it points to the right directories. If you don't have one already, click the New button and create it.

PYTHON CODE

Alternatively, you can also do below your code:-

import sys
sys.path.append("/home/me/mypy")

SQL Server 2008 - Help writing simple INSERT Trigger

cmsjr had the right solution. I just wanted to point out a couple of things for your future trigger development. If you are using the values statement in an insert in a trigger, there is a stong possibility that you are doing the wrong thing. Triggers fire once for each batch of records inserted, deleted, or updated. So if ten records were inserted in one batch, then the trigger fires once. If you are refering to the data in the inserted or deleted and using variables and the values clause then you are only going to get the data for one of those records. This causes data integrity problems. You can fix this by using a set-based insert as cmsjr shows above or by using a cursor. Don't ever choose the cursor path. A cursor in a trigger is a problem waiting to happen as they are slow and may well lock up your table for hours. I removed a cursor from a trigger once and improved an import process from 40 minutes to 45 seconds.

You may think nobody is ever going to add multiple records, but it happens more frequently than most non-database people realize. Don't write a trigger that will not work under all the possible insert, update, delete conditions. Nobody is going to use the one record at a time method when they have to import 1,000,000 sales target records from a new customer or update all the prices by 10% or delete all the records from a vendor whose products you don't sell anymore.

Difficulty with ng-model, ng-repeat, and inputs

I tried the solution above for my problem at it worked like a charm. Thanks!

http://jsfiddle.net/leighboone/wn9Ym/7/

Here is my version of that:

var myApp = angular.module('myApp', []);
function MyCtrl($scope) {
    $scope.models = [{
        name: 'Device1',
        checked: true
    }, {
        name: 'Device1',
        checked: true
    }, {
        name: 'Device1',
        checked: true
    }];

}

and my HTML

<div ng-app="myApp">
    <div ng-controller="MyCtrl">
         <h1>Fun with Fields and ngModel</h1>
        <p>names: {{models}}</p>
        <table class="table table-striped">
            <thead>
                <tr>
                    <th></th>
                    <th>Feature 1</td>
                    <th>Feature 2</th>
                    <th>Feature 3</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Device</td>
                   <td ng-repeat="modelCheck in models" class=""> <span>
                                    {{modelCheck.checked}}
                                </span>

                    </td>
                </tr>
                <tr>
                    <td>
                        <label class="control-label">Which devices?</label>
                    </td>
                    <td ng-repeat="model in models">{{model.name}}
                        <input type="checkbox" class="checkbox inline" ng-model="model.checked" />
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
</div>

Finding the median of an unsorted array

It can be done using Quickselect Algorithm in O(n), do refer to Kth order statistics (randomized algorithms).

AngularJS : Prevent error $digest already in progress when calling $scope.$apply()

This is my utils service:

angular.module('myApp', []).service('Utils', function Utils($timeout) {
    var Super = this;

    this.doWhenReady = function(scope, callback, args) {
        if(!scope.$$phase) {
            if (args instanceof Array)
                callback.apply(scope, Array.prototype.slice.call(args))
            else
                callback();
        }
        else {
            $timeout(function() {
                Super.doWhenReady(scope, callback, args);
            }, 250);
        }
    };
});

and this is an example for it's usage:

angular.module('myApp').controller('MyCtrl', function ($scope, Utils) {
    $scope.foo = function() {
        // some code here . . .
    };

    Utils.doWhenReady($scope, $scope.foo);

    $scope.fooWithParams = function(p1, p2) {
        // some code here . . .
    };

    Utils.doWhenReady($scope, $scope.fooWithParams, ['value1', 'value2']);
};

WebSockets protocol vs HTTP

The other answers do not seem to touch on a key aspect here, and that is you make no mention of requiring supporting a web browser as a client. Most of the limitations of plain HTTP above are assuming you would be working with browser/ JS implementations.

The HTTP protocol is fully capable of full-duplex communication; it is legal to have a client perform a POST with a chunked encoding transfer, and a server to return a response with a chunked-encoding body. This would remove the header overhead to just at init time.

So if all you're looking for is full-duplex, control both client and server, and are not interested in extra framing/features of WebSockets, then I would argue that HTTP is a simpler approach with lower latency/CPU (although the latency would really only differ in microseconds or less for either).

Get only the Date part of DateTime in mssql

This may also help:

SELECT convert(varchar, getdate(), 100) -- mon dd yyyy hh:mmAM (or PM)
                                        -- Oct  2 2008 11:01AM
SELECT convert(varchar, getdate(), 101) -- mm/dd/yyyy - 10/02/2008                  
SELECT convert(varchar, getdate(), 102) -- yyyy.mm.dd – 2008.10.02           
SELECT convert(varchar, getdate(), 103) -- dd/mm/yyyy
SELECT convert(varchar, getdate(), 104) -- dd.mm.yyyy
SELECT convert(varchar, getdate(), 105) -- dd-mm-yyyy
SELECT convert(varchar, getdate(), 106) -- dd mon yyyy
SELECT convert(varchar, getdate(), 107) -- mon dd, yyyy
SELECT convert(varchar, getdate(), 108) --  hh:mm:ss
SELECT convert(varchar, getdate(), 109) -- mon dd yyyy hh:mm:ss:mmmAM (or PM)
                                        -- Oct  2 2008 11:02:44:013AM   
SELECT convert(varchar, getdate(), 110) -- mm-dd-yyyy
SELECT convert(varchar, getdate(), 111) -- yyyy/mm/dd
SELECT convert(varchar, getdate(), 112) -- yyyymmdd
SELECT convert(varchar, getdate(), 113) -- dd mon yyyy hh:mm:ss:mmm
                                        --  02 Oct 2008 11:02:07:577     
SELECT convert(varchar, getdate(), 114) -- hh:mm:ss:mmm(24h)
SELECT convert(varchar, getdate(), 120) -- yyyy-mm-dd hh:mm:ss(24h)
SELECT convert(varchar, getdate(), 121) --  yyyy-mm-dd hh:mm:ss.mmm
SELECT convert(varchar, getdate(), 126) -- yyyy-mm-ddThh:mm:ss.mmm
                                        --  2008-10-02T10:52:47.513
-- SQL create different date styles with t-sql string functions
SELECT replace(convert(varchar, getdate(), 111), '/', ' ') -- yyyy mm dd
SELECT convert(varchar(7), getdate(), 126)                 -- yyyy-mm
SELECT right(convert(varchar, getdate(), 106), 8)          -- mon yyyy

The Source

Display all post meta keys and meta values of the same post ID in wordpress

As of Jan 2020 and WordPress v5.3.2, I confirm the following works fine.

~~It will include the field keys with their equivalent underscore keys as well, but I guess if you properly "enum" your keys in your code, that should be no problem:~~

$meta_values   = get_post_meta( get_the_ID() );
$example_field = meta_values['example_field_key'][0];

//OR if you do enum style 
//(emulation of a class with a list of *const* as enum does not exist in PHP per se)
$example_field = meta_values[PostTypeEnum::FIELD_EXAMPLE_KEY][0];

As the print_r(meta_values); gives:

Array
(
    [_edit_lock] => Array
        (
            [0] => 1579542560:1
        )

    [_edit_last] => Array
        (
            [0] => 1
        )

    [example_field] => Array
        (
            [0] => 13
        )
)

Hope that helps someone, go make a ruckus!

Removing elements from an array in C

I usually do this and works always.

/try this/

for (i = res; i < *size-1; i++) { 

    arrb[i] = arrb[i + 1];
}

*size = *size - 1; /*in some ides size -- could give problems*/

Update cordova plugins in one command

If you install the third party package:

npm i cordova-check-plugins

You can then run a simple command of

cordova-check-plugins --update=auto --force

Keep in mind forcing anything always comes with potential risks of breaking changes.

As other answers have stated, the connecting NPM packages that manage these plugins also require a consequent update when updating the plugins, so now you can check them with:

npm outdated

And then sweeping update them with

npm update

Now tentatively serve your app again and check all of the things that have potentially gone awry from breaking changes. The joy of software development! :)

linux shell script: split string, put them in an array then loop through them

sentence="one;two;three"
a="${sentence};"
while [ -n "${a}" ]
do
    echo ${a%%;*}
    a=${a#*;}
done

symfony2 twig path with parameter url creation

Set the default value for the active argument in the route.

R dplyr: Drop multiple columns

We can try

iris %>% 
      select_(.dots= setdiff(names(.),drop.cols))

Select data between a date/time range

A simple way :

select  * from  hockey_stats 
where  game_date >= '2012-03-11' and game_date  <= '2012-05-11'

How can I change the current URL?

If you just want to update the relative path you can also do

window.location.pathname = '/relative-link'

"http://domain.com" -> "http://domain.com/relative-link"

PHP, pass array through POST

Why are you sending it through a post if you already have it on the server (PHP) side?

Why not just save the array to s $_SESSION variable so you can use it when the form gets submitted, that might make it more "secure" since then the client cannot change the variables by editing the source.

It all depends on what you really want to do.

Configure apache to listen on port other than 80

This is working for me on Centos

First: in file /etc/httpd/conf/httpd.conf

add

Listen 8079

after

Listen 80

This till your server to listen to the port 8079

Second: go to your virtual host for ex. /etc/httpd/conf.d/vhost.conf

and add this code below

<VirtualHost *:8079>
   DocumentRoot /var/www/html/api_folder
   ServerName example.com
   ServerAlias www.example.com
   ServerAdmin [email protected]
   ErrorLog logs/www.example.com-error_log
   CustomLog logs/www.example.com-access_log common
</VirtualHost>

This mean when you go to your www.example.com:8079 redirect to

/var/www/html/api_folder

But you need first to restart the service

sudo service httpd restart

When and where to use GetType() or typeof()?

typeof is applied to a name of a type or generic type parameter known at compile time (given as identifier, not as string). GetType is called on an object at runtime. In both cases the result is an object of the type System.Type containing meta-information on a type.

Example where compile-time and run-time types are equal

string s = "hello";

Type t1 = typeof(string);
Type t2 = s.GetType();

t1 == t2 ==> true

Example where compile-time and run-time types are different

object obj = "hello";

Type t1 = typeof(object); // ==> object
Type t2 = obj.GetType();  // ==> string!

t1 == t2 ==> false

i.e., the compile time type (static type) of the variable obj is not the same as the runtime type of the object referenced by obj.

Testing types

If, however, you only want to know whether mycontrol is a TextBox then you can simply test

if (mycontrol is TextBox)

Note that this is not completely equivalent to

if (mycontrol.GetType() == typeof(TextBox))

because mycontrol could have a type that is derived from TextBox. In that case the first comparison yields true and the second false! The first and easier variant is OK in most cases, since a control derived from TextBox inherits everything that TextBox has, probably adds more to it and is therefore assignment compatible to TextBox.

public class MySpecializedTextBox : TextBox
{
}

MySpecializedTextBox specialized = new MySpecializedTextBox();
if (specialized is TextBox)       ==> true

if (specialized.GetType() == typeof(TextBox))        ==> false

Casting

If you have the following test followed by a cast and T is nullable ...

if (obj is T) {
    T x = (T)obj; // The casting tests, whether obj is T again!
    ...
}

... you can change it to ...

T x = obj as T;
if (x != null) {
    ...
}

Testing whether a value is of a given type and casting (which involves this same test again) can both be time consuming for long inheritance chains. Using the as operator followed by a test for null is more performing.

Starting with C# 7.0 you can simplify the code by using pattern matching:

if (obj is T t) {
    // t is a variable of type T having a non-null value.
    ...
}

Btw.: this works for value types as well. Very handy for testing and unboxing. Note that you cannot test for nullable value types:

if (o is int? ni) ===> does NOT compile!

This is because either the value is null or it is an int. This works for int? o as well as for object o = new Nullable<int>(x);:

if (o is int i) ===> OK!

I like it, because it eliminates the need to access the Nullable<T>.Value property.

Given a DateTime object, how do I get an ISO 8601 date in string format?

DateTime.UtcNow.ToString("s")

Returns something like 2008-04-10T06:30:00

UtcNow obviously returns a UTC time so there is no harm in:

string.Concat(DateTime.UtcNow.ToString("s"), "Z")

Where do I put a single filter that filters methods in two controllers in Rails

Two ways.

i. You can put it in ApplicationController and add the filters in the controller

    class ApplicationController < ActionController::Base       def filter_method       end     end      class FirstController < ApplicationController       before_filter :filter_method     end      class SecondController < ApplicationController       before_filter :filter_method     end

But the problem here is that this method will be added to all the controllers since all of them extend from application controller

ii. Create a parent controller and define it there

 class ParentController < ApplicationController   def filter_method   end  end  class FirstController < ParentController   before_filter :filter_method end  class SecondController < ParentController   before_filter :filter_method end

I have named it as parent controller but you can come up with a name that fits your situation properly.

You can also define the filter method in a module and include it in the controllers where you need the filter

React : difference between <Route exact path="/" /> and <Route path="/" />

In this example, nothing really. The exact param comes into play when you have multiple paths that have similar names:

For example, imagine we had a Users component that displayed a list of users. We also have a CreateUser component that is used to create users. The url for CreateUsers should be nested under Users. So our setup could look something like this:

<Switch>
  <Route path="/users" component={Users} />
  <Route path="/users/create" component={CreateUser} />
</Switch>

Now the problem here, when we go to http://app.com/users the router will go through all of our defined routes and return the FIRST match it finds. So in this case, it would find the Users route first and then return it. All good.

But, if we went to http://app.com/users/create, it would again go through all of our defined routes and return the FIRST match it finds. React router does partial matching, so /users partially matches /users/create, so it would incorrectly return the Users route again!

The exact param disables the partial matching for a route and makes sure that it only returns the route if the path is an EXACT match to the current url.

So in this case, we should add exact to our Users route so that it will only match on /users:

<Switch>
  <Route exact path="/users" component={Users} />
  <Route path="/users/create" component={CreateUser} />
</Switch>

The docs explain exact in detail and give other examples.

Hash string in c#

//Secure & Encrypte Data
    public static string HashSHA1(string value)
    {
        var sha1 = SHA1.Create();
        var inputBytes = Encoding.ASCII.GetBytes(value);
        var hash = sha1.ComputeHash(inputBytes);
        var sb = new StringBuilder();
        for (var i = 0; i < hash.Length; i++)
        {
            sb.Append(hash[i].ToString("X2"));
        }
        return sb.ToString();
    }

MySQL SELECT only not null values

You can filter out rows that contain a NULL value in a specific column:

SELECT col1, col2, ..., coln
FROM yourtable
WHERE somecolumn IS NOT NULL

If you want to filter out rows that contain a null in any column then try this:

SELECT col1, col2, ..., coln
FROM yourtable
WHERE col1 IS NOT NULL
AND col2 IS NOT NULL
-- ...
AND coln IS NOT NULL

Update: Based on your comments, perhaps you want this?

SELECT * FROM
(
    SELECT col1 AS col FROM yourtable
    UNION
    SELECT col2 AS col FROM yourtable
    UNION
    -- ...
    UNION
    SELECT coln AS col FROM yourtable
) T1
WHERE col IS NOT NULL

And I agre with Martin that if you need to do this then you should probably change your database design.

Usage of the backtick character (`) in JavaScript

A lot of the comments answer most of your questions, but I mainly wanted to contribute to this question:

Is there a way in which the behavior of the backtick actually differs from that of a single quote?

A difference I've noticed for template strings is the disability to set one as an object property. More information in this post; an interesting quote from the accepted answer:

Template strings are expressions, not literals1.

But basically, if you ever wanted to use it as an object property you'd have to use it wrapped with square brackets.

// Throws error
const object = {`templateString`: true};

// Works
const object = {[`templateString`]: true};

Programs & Examples On #Cognos tm1

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