Programs & Examples On #Iphone sdk 3.1.3

Refers to the iPhone software development kit, version 3.1.3

How to change the background-color of jumbrotron?

You don't necessarily have to use custom CSS (or even worse inline CSS), in Bootstrap 4 you can use the utility classes for colors, like:

<div class="jumbotron bg-dark text-white">
...

And if you need other colors than the default ones, just add additional bg-classes using the same naming convention. This keeps the code neat and understandable.

You might also need to set text-white on child-elements inside the jumbotron, like headings.

How do I fetch multiple columns for use in a cursor loop?

Here is slightly modified version. Changes are noted as code commentary.

BEGIN TRANSACTION

declare @cnt int
declare @test nvarchar(128)
-- variable to hold table name
declare @tableName nvarchar(255)
declare @cmd nvarchar(500) 
-- local means the cursor name is private to this code
-- fast_forward enables some speed optimizations
declare Tests cursor local fast_forward for
 SELECT COLUMN_NAME, TABLE_NAME
   FROM INFORMATION_SCHEMA.COLUMNS 
  WHERE COLUMN_NAME LIKE 'pct%' 
    AND TABLE_NAME LIKE 'TestData%'

open Tests
-- Instead of fetching twice, I rather set up no-exit loop
while 1 = 1
BEGIN
  -- And then fetch
  fetch next from Tests into @test, @tableName
  -- And then, if no row is fetched, exit the loop
  if @@fetch_status <> 0
  begin
     break
  end
  -- Quotename is needed if you ever use special characters
  -- in table/column names. Spaces, reserved words etc.
  -- Other changes add apostrophes at right places.
  set @cmd = N'exec sp_rename ''' 
           + quotename(@tableName) 
           + '.' 
           + quotename(@test) 
           + N''',''' 
           + RIGHT(@test,LEN(@test)-3) 
           + '_Pct''' 
           + N', ''column''' 

  print @cmd

  EXEC sp_executeSQL @cmd
END

close Tests 
deallocate Tests

ROLLBACK TRANSACTION
--COMMIT TRANSACTION

How to take MySQL database backup using MySQL Workbench?

Sever > Data Export

enter image description here

Select database, and start export

enter image description here

Jmeter - get current date and time

Use this format: ${__time(yyyy-MM-dd'T'hh:mm:ss.SS'Z')}

Which will give you: 2018-01-16T08:32:28.75Z

Insert Data Into Temp Table with Query

Fastest way to do this is using "SELECT INTO" command e.g.

SELECT * INTO #TempTableName
FROM....

This will create a new table, you don't have to create it in advance.

How can I read a text file in Android?

First you store your text file in to raw folder.

private void loadWords() throws IOException {
    Log.d(TAG, "Loading words...");
    final Resources resources = mHelperContext.getResources();
    InputStream inputStream = resources.openRawResource(R.raw.definitions);
    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

    try {
        String line;
        while ((line = reader.readLine()) != null) {
            String[] strings = TextUtils.split(line, "-");
            if (strings.length < 2)
                continue;
            long id = addWord(strings[0].trim(), strings[1].trim());
            if (id < 0) {
                Log.e(TAG, "unable to add word: " + strings[0].trim());
            }
        }
    } finally {
        reader.close();
    }
    Log.d(TAG, "DONE loading words.");
}

How can I add an item to a ListBox in C# and WinForms?

The way I do this - using the format Event

  MyClass c = new MyClass();
  listBox1.Items.Add(c);

  private void listBox1_Format(object sender, ListControlConvertEventArgs e)
    {
        if(e.ListItem is MyClass)
        {
            e.Value = ((MyClass)e.ListItem).ToString();
        }
        else
        {
            e.Value = "Unknown item added";
        }
    }

e.Value being the Display Text

Then you can attempt to cast the SelectedItem to MyClass to get access to anything you had in there.
Also note, you can use anything (that inherits from object anyway(which is pretty much everything)) in the Items Collection.

Bootstrap 3 select input form inline

Based on spacebean's answer, this modification also changes the displayed text when the user selects a different item (just as a <select> would do):

http://www.bootply.com/VxVlaebtnL

HTML:

<div class="container">
  <div class="col-sm-7 pull-right well">
    <form class="form-inline" action="#" method="get">
      <div class="input-group col-sm-8">
        <input class="form-control" type="text" value="" placeholder="Search" name="q">
        <div class="input-group-btn">
          <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><span id="mydropdowndisplay">Choice 1</span> <span class="caret"></span></button>
          <ul class="dropdown-menu" id="mydropdownmenu">
            <li><a href="#">Choice 1</a></li>
            <li><a href="#">Choice 2</a></li>
            <li><a href="#">Choice 3</a></li>
          </ul>
          <input type="hidden" id="mydropwodninput" name="category">
        </div><!-- /btn-group -->
      </div>
    <button class="btn btn-primary col-sm-3 pull-right" type="submit">Search</button>
    </form>
  </div>
</div>

Jquery:

$('#mydropdownmenu > li').click(function(e){
  e.preventDefault();
  var selected = $(this).text();
  $('#mydropwodninput').val(selected);
  $('#mydropdowndisplay').text(selected);
});

How do I Geocode 20 addresses without receiving an OVER_QUERY_LIMIT response?

I have just tested Google Geocoder and got the same problem as you have. I noticed I only get the OVER_QUERY_LIMIT status once every 12 requests So I wait for 1 second (that's the minimum delay to wait) It slows down the application but less than waiting 1 second every request

info = getInfos(getLatLng(code)); //In here I call Google API
record(code, info);
generated++; 
if(generated%interval == 0) {
holdOn(delay); // Every x requests, I sleep for 1 second
}

With the basic holdOn method :

private void holdOn(long delay) {
        try {
            Thread.sleep(delay);
        } catch (InterruptedException ex) {
            // ignore
        }
    }

Hope it helps

Flash CS4 refuses to let go

I have found one related behaviour that may help (sounds like your specific problem runs deeper though):

Flash checks whether a source file needs recompiling by looking at timestamps. If its compiled version is older than the source file, it will recompile. But it doesn't check whether the compiled version was generated from the same source file or not.

Specifically, if you have your actionscript files under version control, and you Revert a change, the reverted file will usually have an older timestamp, and Flash will ignore it.

What is the function of the push / pop instructions used on registers in x86 assembly?

Pushing and popping registers are behind the scenes equivalent to this:

push reg   <= same as =>      sub  $8,%rsp        # subtract 8 from rsp
                              mov  reg,(%rsp)     # store, using rsp as the address

pop  reg    <= same as=>      mov  (%rsp),reg     # load, using rsp as the address
                              add  $8,%rsp        # add 8 to the rsp

Note this is x86-64 At&t syntax.

Used as a pair, this lets you save a register on the stack and restore it later. There are other uses, too.

How to check for changes on remote (origin) Git repository

git remote update && git status 

Found this on the answer to Check if pull needed in Git

git remote update to bring your remote refs up to date. Then you can do one of several things, such as:

  1. git status -uno will tell you whether the branch you are tracking is ahead, behind or has diverged. If it says nothing, the local and remote are the same.

  2. git show-branch *master will show you the commits in all of the branches whose names end in master (eg master and origin/master).

If you use -v with git remote update you can see which branches got updated, so you don't really need any further commands.

Spring AMQP + RabbitMQ 3.3.5 ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN

The error

ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.

can occur if the credentials that your application is trying to use to connect to RabbitMQ are incorrect or missing.

I had this happen when the RabbitMQ credentials stored in my ASP.NET application's web.config file had a value of "" for the password instead of the actual password string value.

How to update Ruby to 1.9.x on Mac?

I'll make a strong suggestion for rvm.

It's a great way to manage multiple Rubies and gems sets without colliding with the system version.


I'll add that now (4/2/2013), I use rbenv a lot, because my needs are simple. RVM is great, but it's got a lot of capability I never need, so I have it on some machines and rbenv on my desktop and laptop. It's worth checking out both and seeing which works best for your needs.

How to Execute a Python File in Notepad ++?

In case someone is interested in passing arguments to cmd.exe and running the python script in a Virtual Environment, these are the steps I used:

On the Notepad++ -> Run -> Run , I enter the following:

cmd /C cd $(CURRENT_DIRECTORY) && "PATH_to_.bat_file" $(FULL_CURRENT_PATH)

Here I cd into the directory in which the .py file exists, so that it enables accessing any other relevant files which are in the directory of the .py code.

And on the .bat file I have:

@ECHO off
set File_Path=%1

call activate Venv
python %File_Path%
pause

Adding a column to a data.frame

In addition to Roman's answer, something like this might be even simpler. Note that I haven't tested it because I do not have access to R right now.

# Note that I use a global variable here
# normally not advisable, but I liked the
# use here to make the code shorter
index <<- 0
new_column = sapply(df$h_no, function(x) {
  if(x == 1) index = index + 1
  return(index)
})

The function iterates over the values in n_ho and always returns the categorie that the current value belongs to. If a value of 1 is detected, we increase the global variable index and continue.

Git reset single file in feature branch to be the same as in master

you are almost there; you just need to give the reference to master; since you want to get the file from the master branch:

git checkout master -- filename

Note that the differences will be cached; so if you want to see the differences you obtained; use

git diff --cached

How do I print an IFrame from javascript in Safari/Chrome

You can use

parent.frames['id'].print();

Work at Chrome!

Trim characters in Java

it appears that there is no ready to use java api that makes that but you can write a method to do that for you. this link might be usefull

Call a Subroutine from a different Module in VBA

Prefix the call with Module2 (ex. Module2.IDLE). I'm assuming since you asked this that you have IDLE defined multiple times in the project, otherwise this shouldn't be necessary.

Is Constructor Overriding Possible?

Constructor looks like a method but name should be as class name and no return value.

Overriding means what we have declared in Super class, that exactly we have to declare in Sub class it is called Overriding. Super class name and Sub class names are different.

If you trying to write Super class Constructor in Sub class, then Sub class will treat that as a method not constructor because name should not match with Sub class name. And it will give an compilation error that methods does not have return value. So we should declare as void, then only it will compile.

How do I setup the InternetExplorerDriver so it works

Basically you need to download the IEDriverServer.exe from Selenium HQ website without executing anything just remmeber the location where you want it and then put the code on Eclipse like this

System.setProperty("webdriver.ie.driver", "C:\\Users\\juan.torres\\Desktop\\QA stuff\\IEDriverServer_Win32_2.32.3\\IEDriverServer.exe");
WebDriver driver= new InternetExplorerDriver();

driver.navigate().to("http://www.youtube.com/");

for the path use double slash //

ok have fun !!

Merge a Branch into Trunk

The syntax is wrong, it should instead be

svn merge <what(the range)> <from(your dev branch)> <to(trunk/trunk local copy)>

How To: Execute command line in C#, get STD OUT results

Here's a quick sample:

//Create process
System.Diagnostics.Process pProcess = new System.Diagnostics.Process();

//strCommand is path and file name of command to run
pProcess.StartInfo.FileName = strCommand;

//strCommandParameters are parameters to pass to program
pProcess.StartInfo.Arguments = strCommandParameters;

pProcess.StartInfo.UseShellExecute = false;

//Set output of program to be written to process output stream
pProcess.StartInfo.RedirectStandardOutput = true;   

//Optional
pProcess.StartInfo.WorkingDirectory = strWorkingDirectory;

//Start the process
pProcess.Start();

//Get program output
string strOutput = pProcess.StandardOutput.ReadToEnd();

//Wait for process to finish
pProcess.WaitForExit();

How to catch all exceptions in c# using try and catch?

    static void Main(string[] args)
    {
        AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
    }

    static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
    {
        throw new NotImplementedException();
    }

How to Query Database Name in Oracle SQL Developer?

Edit: Whoops, didn't check your question tags before answering.

Check that you can actually connect to DB (have the driver placed? tested the conn when creating it?).

If so, try runnung those queries with F5

Maven fails to find local artifact

As the options here didn't work for me, I'm sharing how I solved it:

My project has a parent project (with its own pom.xml) that has many children modules, one of which (A) has a dependency to another child (B). When I tried mvn package in A, it didn't work because B could not be resolved.

Executing mvn install in the parent directory did the job. After that, I could do mvn package inside of A and only then it could find B.

Regular expression to allow spaces between words

try .*? to allow white spaces it worked for me

Difference between Select Unique and Select Distinct

SELECT UNIQUE is old syntax supported by Oracle's flavor of SQL. It is synonymous with SELECT DISTINCT.

Use SELECT DISTINCT because this is standard SQL, and SELECT UNIQUE is non-standard, and in database brands other than Oracle, SELECT UNIQUE may not be recognized at all.

How to get all files under a specific directory in MATLAB?

You can use regexp or strcmp to eliminate . and .. Or you could use the isdir field if you only want files in the directory, not folders.

list=dir(pwd);  %get info of files/folders in current directory
isfile=~[list.isdir]; %determine index of files vs folders
filenames={list(isfile).name}; %create cell array of file names

or combine the last two lines:

filenames={list(~[list.isdir]).name};

For a list of folders in the directory excluding . and ..

dirnames={list([list.isdir]).name};
dirnames=dirnames(~(strcmp('.',dirnames)|strcmp('..',dirnames)));

From this point, you should be able to throw the code in a nested for loop, and continue searching each subfolder until your dirnames returns an empty cell for each subdirectory.

How to create an Array, ArrayList, Stack and Queue in Java?

I am guessing you're confused with the parameterization of the types:

// This works, because there is one class/type definition in the parameterized <> field
ArrayList<String> myArrayList = new ArrayList<String>(); 


// This doesn't work, as you cannot use primitive types here
ArrayList<char> myArrayList = new ArrayList<char>();

Why doesn't Git ignore my specified file?

What I did it to ignore the settings.php file successfully:

  1. git rm --cached sites/default/settings.php
  2. commit (up to here didn't work)
  3. manually deleted sites/default/settings.php (this did the trick)
  4. git add .
  5. commit (ignored successfully)

I think if there's the committed file on Git then ignore doesn't work as expected. Just delete the file and commit. Afterwards it'll ignore.

PIL image to array (numpy array to array) - Python

I think what you are looking for is:

list(im.getdata())

or, if the image is too big to load entirely into memory, so something like that:

for pixel in iter(im.getdata()):
    print pixel

from PIL documentation:

getdata

im.getdata() => sequence

Returns the contents of an image as a sequence object containing pixel values. The sequence object is flattened, so that values for line one follow directly after the values of line zero, and so on.

Note that the sequence object returned by this method is an internal PIL data type, which only supports certain sequence operations, including iteration and basic sequence access. To convert it to an ordinary sequence (e.g. for printing), use list(im.getdata()).

Put search icon near textbox using bootstrap

Here are three different ways to do it:

screenshot

Here's a working Demo in Fiddle Of All Three

Validation:

You can use native bootstrap validation states (No Custom CSS!):

<div class="form-group has-feedback">
    <label class="control-label" for="inputSuccess2">Name</label>
    <input type="text" class="form-control" id="inputSuccess2"/>
    <span class="glyphicon glyphicon-search form-control-feedback"></span>
</div>

For a full discussion, see my answer to Add a Bootstrap Glyphicon to Input Box

Input Group:

You can use the .input-group class like this:

<div class="input-group">
    <input type="text" class="form-control"/>
    <span class="input-group-addon">
        <i class="fa fa-search"></i>
    </span>
</div>

For a full discussion, see my answer to adding Twitter Bootstrap icon to Input box

Unstyled Input Group:

You can still use .input-group for positioning but just override the default styling to make the two elements appear separate.

Use a normal input group but add the class input-group-unstyled:

<div class="input-group input-group-unstyled">
    <input type="text" class="form-control" />
    <span class="input-group-addon">
        <i class="fa fa-search"></i>
    </span>
</div>

Then change the styling with the following css:

.input-group.input-group-unstyled input.form-control {
    -webkit-border-radius: 4px;
       -moz-border-radius: 4px;
            border-radius: 4px;
}
.input-group-unstyled .input-group-addon {
    border-radius: 4px;
    border: 0px;
    background-color: transparent;
}

Also, these solutions work for any input size

How to check if a service is running via batch file and start it, if it is not running?

To toggle a service use the following;

NET START "Distributed Transaction Coordinator" ||NET STOP "Distributed Transaction Coordinator"

java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed

Bump...

I just had the same error. I noticed that I was invoking super.doPost(request, response); when overriding the doPost() method as well as explicitly invoking the superclass constructor

    public ScheduleServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

As soon as I commented out the super.doPost(request, response); from within doPost() statement it worked perfectly...

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //super.doPost(request, response);
        // More code here...

}

Needless to say, I need to re-read on super() best practices :p

How to enable loglevel debug on Apache2 server

You need to use LogLevel rewrite:trace3 to your httpd.conf in newer version http://httpd.apache.org/docs/2.4/mod/mod_rewrite.html#logging

What's the fastest way to read a text file line-by-line?

If you have enough memory, I've found some performance gains by reading the entire file into a memory stream, and then opening a stream reader on that to read the lines. As long as you actually plan on reading the whole file anyway, this can yield some improvements.

What is the difference between print and puts?

puts call the to_s of each argument and adds a new line to each string, if it does not end with new line. print just output each argument by calling their to_s.

for example: puts "one two": one two

{new line}

puts "one two\n": one two

{new line} #puts will not add a new line to the result, since the string ends with a new line

print "one two": one two

print "one two\n": one two

{new line}

And there is another way to output: p

For each object, directly writes obj.inspect followed by a newline to the program’s standard output.

It is helpful to output debugging message. p "aa\n\t": aa\n\t

How to have comments in IntelliSense for function in Visual Studio?

Those are called XML Comments. They have been a part of Visual Studio since forever.

You can make your documentation process easier by using GhostDoc, a free add-in for Visual Studio which generates XML-doc comments for you. Just place your caret on the method/property you want to document, and press Ctrl-Shift-D.

Here's an example from one of my posts.

Hope that helps :)

Python argparse: default value or specified value

Actually, you only need to use the default argument to add_argument as in this test.py script:

import argparse

if __name__ == '__main__':

    parser = argparse.ArgumentParser()
    parser.add_argument('--example', default=1)
    args = parser.parse_args()
    print(args.example)

test.py --example
% 1
test.py --example 2
% 2

Details are here.

@Directive vs @Component in Angular

A @Component requires a view whereas a @Directive does not.

Directives

I liken a @Directive to an Angular 1.0 directive with the option restrict: 'A' (Directives aren't limited to attribute usage.) Directives add behaviour to an existing DOM element or an existing component instance. One example use case for a directive would be to log a click on an element.

import {Directive} from '@angular/core';

@Directive({
    selector: "[logOnClick]",
    hostListeners: {
        'click': 'onClick()',
    },
})
class LogOnClick {
    constructor() {}
    onClick() { console.log('Element clicked!'); }
}

Which would be used like so:

<button logOnClick>I log when clicked!</button>

Components

A component, rather than adding/modifying behaviour, actually creates its own view (hierarchy of DOM elements) with attached behaviour. An example use case for this might be a contact card component:

import {Component, View} from '@angular/core';

@Component({
  selector: 'contact-card',
  template: `
    <div>
      <h1>{{name}}</h1>
      <p>{{city}}</p>
    </div>
  `
})
class ContactCard {
  @Input() name: string
  @Input() city: string
  constructor() {}
}

Which would be used like so:

<contact-card [name]="'foo'" [city]="'bar'"></contact-card>

ContactCard is a reusable UI component that we could use anywhere in our application, even within other components. These basically make up the UI building blocks of our applications.

In summary

Write a component when you want to create a reusable set of DOM elements of UI with custom behaviour. Write a directive when you want to write reusable behaviour to supplement existing DOM elements.

Sources:

Python: Get the first character of the first string in a list?

Get the first character of a bare python string:

>>> mystring = "hello"
>>> print(mystring[0])
h
>>> print(mystring[:1])
h
>>> print(mystring[3])
l
>>> print(mystring[-1])
o
>>> print(mystring[2:3])
l
>>> print(mystring[2:4])
ll

Get the first character from a string in the first position of a python list:

>>> myarray = []
>>> myarray.append("blah")
>>> myarray[0][:1]
'b'
>>> myarray[0][-1]
'h'
>>> myarray[0][1:3]
'la'

Many people get tripped up here because they are mixing up operators of Python list objects and operators of Numpy ndarray objects:

Numpy operations are very different than python list operations.

Wrap your head around the two conflicting worlds of Python's "list slicing, indexing, subsetting" and then Numpy's "masking, slicing, subsetting, indexing, then numpy's enhanced fancy indexing".

These two videos cleared things up for me:

"Losing your Loops, Fast Numerical Computing with NumPy" by PyCon 2015: https://youtu.be/EEUXKG97YRw?t=22m22s

"NumPy Beginner | SciPy 2016 Tutorial" by Alexandre Chabot LeClerc: https://youtu.be/gtejJ3RCddE?t=1h24m54s

Oracle - What TNS Names file am I using?

Not direct answer to your question, but I've been quite frustrated myself trying find and update all of the tnsnames files, as I had several oracle installs: Client, BI tools, OWB, etc, each of which had its own oracle home. I ended up creating a utility called TNSNamesSync that will update all of the tnsnames in all of the oracle homes. It's under the MIT license, free to use here https://github.com/artybug/TNSNamesSync/releases

The docs are here: https://github.com/artchik/TNSNamesSync/blob/master/README.md

This is for Windows only, though.

How to upload files on server folder using jsp

You can only use absolute path http://grand-shopping.com/<"some folder"> is not an absolute path.

Either you can use a path inside the application which is vurneable or you can use server specific path like in

windows -> C:/Users/puneet verma/Downloads/
linux -> /opt/Downloads/

How to choose the right bean scope?

Introduction

It represents the scope (the lifetime) of the bean. This is easier to understand if you are familiar with "under the covers" working of a basic servlet web application: How do servlets work? Instantiation, sessions, shared variables and multithreading.


@Request/View/Flow/Session/ApplicationScoped

A @RequestScoped bean lives as long as a single HTTP request-response cycle (note that an Ajax request counts as a single HTTP request too). A @ViewScoped bean lives as long as you're interacting with the same JSF view by postbacks which call action methods returning null/void without any navigation/redirect. A @FlowScoped bean lives as long as you're navigating through the specified collection of views registered in the flow configuration file. A @SessionScoped bean lives as long as the established HTTP session. An @ApplicationScoped bean lives as long as the web application runs. Note that the CDI @Model is basically a stereotype for @Named @RequestScoped, so same rules apply.

Which scope to choose depends solely on the data (the state) the bean holds and represents. Use @RequestScoped for simple and non-ajax forms/presentations. Use @ViewScoped for rich ajax-enabled dynamic views (ajaxbased validation, rendering, dialogs, etc). Use @FlowScoped for the "wizard" ("questionnaire") pattern of collecting input data spread over multiple pages. Use @SessionScoped for client specific data, such as the logged-in user and user preferences (language, etc). Use @ApplicationScoped for application wide data/constants, such as dropdown lists which are the same for everyone, or managed beans without any instance variables and having only methods.

Abusing an @ApplicationScoped bean for session/view/request scoped data would make it to be shared among all users, so anyone else can see each other's data which is just plain wrong. Abusing a @SessionScoped bean for view/request scoped data would make it to be shared among all tabs/windows in a single browser session, so the enduser may experience inconsitenties when interacting with every view after switching between tabs which is bad for user experience. Abusing a @RequestScoped bean for view scoped data would make view scoped data to be reinitialized to default on every single (ajax) postback, causing possibly non-working forms (see also points 4 and 5 here). Abusing a @ViewScoped bean for request, session or application scoped data, and abusing a @SessionScoped bean for application scoped data doesn't affect the client, but it unnecessarily occupies server memory and is plain inefficient.

Note that the scope should rather not be chosen based on performance implications, unless you really have a low memory footprint and want to go completely stateless; you'd need to use exclusively @RequestScoped beans and fiddle with request parameters to maintain the client's state. Also note that when you have a single JSF page with differently scoped data, then it's perfectly valid to put them in separate backing beans in a scope matching the data's scope. The beans can just access each other via @ManagedProperty in case of JSF managed beans or @Inject in case of CDI managed beans.

See also:


@CustomScoped/NoneScoped/Dependent

It's not mentioned in your question, but (legacy) JSF also supports @CustomScoped and @NoneScoped, which are rarely used in real world. The @CustomScoped must refer a custom Map<K, Bean> implementation in some broader scope which has overridden Map#put() and/or Map#get() in order to have more fine grained control over bean creation and/or destroy.

The JSF @NoneScoped and CDI @Dependent basically lives as long as a single EL-evaluation on the bean. Imagine a login form with two input fields referring a bean property and a command button referring a bean action, thus with in total three EL expressions, then effectively three instances will be created. One with the username set, one with the password set and one on which the action is invoked. You normally want to use this scope only on beans which should live as long as the bean where it's being injected. So if a @NoneScoped or @Dependent is injected in a @SessionScoped, then it will live as long as the @SessionScoped bean.

See also:


Flash scope

As last, JSF also supports the flash scope. It is backed by a short living cookie which is associated with a data entry in the session scope. Before the redirect, a cookie will be set on the HTTP response with a value which is uniquely associated with the data entry in the session scope. After the redirect, the presence of the flash scope cookie will be checked and the data entry associated with the cookie will be removed from the session scope and be put in the request scope of the redirected request. Finally the cookie will be removed from the HTTP response. This way the redirected request has access to request scoped data which was been prepared in the initial request.

This is actually not available as a managed bean scope, i.e. there's no such thing as @FlashScoped. The flash scope is only available as a map via ExternalContext#getFlash() in managed beans and #{flash} in EL.

See also:

Scala: write string to file in one statement

A micro library I wrote: https://github.com/pathikrit/better-files

file.write("Hi!")

or

file << "Hi!"

How do I use MySQL through XAMPP?

XAMPP only offers MySQL (Database Server) & Apache (Webserver) in one setup and you can manage them with the xampp starter.

After the successful installation navigate to your xampp folder and execute the xampp-control.exe

Press the start Button at the mysql row.

enter image description here

Now you've successfully started mysql. Now there are 2 different ways to administrate your mysql server and its databases.

But at first you have to set/change the MySQL Root password. Start the Apache server and type localhost or 127.0.0.1 in your browser's address bar. If you haven't deleted anything from the htdocs folder the xampp status page appears. Navigate to security settings and change your mysql root password.

Now, you can browse to your phpmyadmin under http://localhost/phpmyadmin or download a windows mysql client for example navicat lite or mysql workbench. Install it and log in to your mysql server with your new root password.

enter image description here

How To Define a JPA Repository Query with a Join

You are experiencing this issue for two reasons.

  • The JPQL Query is not valid.
  • You have not created an association between your entities that the underlying JPQL query can utilize.

When performing a join in JPQL you must ensure that an underlying association between the entities attempting to be joined exists. In your example, you are missing an association between the User and Area entities. In order to create this association we must add an Area field within the User class and establish the appropriate JPA Mapping. I have attached the source for User below. (Please note I moved the mappings to the fields)

User.java

@Entity
@Table(name="user")
public class User {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="iduser")
    private Long idUser;

    @Column(name="user_name")
    private String userName;

    @OneToOne()
    @JoinColumn(name="idarea")
    private Area area;

    public Long getIdUser() {
        return idUser;
    }

    public void setIdUser(Long idUser) {
        this.idUser = idUser;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Area getArea() {
        return area;
    }

    public void setArea(Area area) {
        this.area = area;
    }
}

Once this relationship is established you can reference the area object in your @Query declaration. The query specified in your @Query annotation must follow proper syntax, which means you should omit the on clause. See the following:

@Query("select u.userName from User u inner join u.area ar where ar.idArea = :idArea")

While looking over your question I also made the relationship between the User and Area entities bidirectional. Here is the source for the Area entity to establish the bidirectional relationship.

Area.java

@Entity
@Table(name = "area")
public class Area {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="idarea")
    private Long idArea;

    @Column(name="area_name")
    private String areaName;

    @OneToOne(fetch=FetchType.LAZY, mappedBy="area")
    private User user;

    public Long getIdArea() {
        return idArea;
    }

    public void setIdArea(Long idArea) {
        this.idArea = idArea;
    }

    public String getAreaName() {
        return areaName;
    }

    public void setAreaName(String areaName) {
        this.areaName = areaName;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }
}

Calculate distance between 2 GPS coordinates

Calculate the distance between two coordinates by latitude and longitude, including a Javascript implementation.

West and South locations are negative. Remember minutes and seconds are out of 60 so S31 30' is -31.50 degrees.

Don't forget to convert degrees to radians. Many languages have this function. Or its a simple calculation: radians = degrees * PI / 180.

function degreesToRadians(degrees) {
  return degrees * Math.PI / 180;
}

function distanceInKmBetweenEarthCoordinates(lat1, lon1, lat2, lon2) {
  var earthRadiusKm = 6371;

  var dLat = degreesToRadians(lat2-lat1);
  var dLon = degreesToRadians(lon2-lon1);

  lat1 = degreesToRadians(lat1);
  lat2 = degreesToRadians(lat2);

  var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
          Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  return earthRadiusKm * c;
}

Here are some examples of usage:

distanceInKmBetweenEarthCoordinates(0,0,0,0)  // Distance between same 
                                              // points should be 0
0

distanceInKmBetweenEarthCoordinates(51.5, 0, 38.8, -77.1) // From London
                                                          // to Arlington
5918.185064088764

In Java what is the syntax for commenting out multiple lines?

  • The simple question to your answer is already answered a lot of times:

    /*
    LINES I WANT COMMENTED
    LINES I WANT COMMENTED
    LINES I WANT COMMENTED
    */
    
  • From your question it sounds like you want to comment out a lot of code?? I would advise to use a repository(git/github) to manage your files instead of commenting out lines.

  • My last advice would be to learn about javadoc if not already familiar because documenting your code is really important.

How to convert dataframe into time series?

Input. We will start with the text of the input shown in the question since the question did not provide the csv input:

Lines <- "Dates   Bajaj_close Hero_close
3/14/2013   1854.8  1669.1
3/15/2013   1850.3  1684.45
3/18/2013   1812.1  1690.5
3/19/2013   1835.9  1645.6
3/20/2013   1840    1651.15
3/21/2013   1755.3  1623.3
3/22/2013   1820.65 1659.6
3/25/2013   1802.5  1617.7
3/26/2013   1801.25 1571.85
3/28/2013   1799.55 1542"

zoo. "ts" class series normally do not represent date indexes but we can create a zoo series that does (see zoo package):

library(zoo)
z <- read.zoo(text = Lines, header = TRUE, format = "%m/%d/%Y")

Alternately, if you have already read this into a data frame DF then it could be converted to zoo as shown on the second line below:

DF <- read.table(text = Lines, header = TRUE)
z <- read.zoo(DF, format = "%m/%d/%Y")

In either case above z ia a zoo series with a "Date" class time index. One could also create the zoo series, zz, which uses 1, 2, 3, ... as the time index:

zz <- z
time(zz) <- seq_along(time(zz))

ts. Either of these could be converted to a "ts" class series:

as.ts(z)
as.ts(zz)

The first has a time index which is the number of days since the Epoch (January 1, 1970) and will have NAs for missing days and the second will have 1, 2, 3, ... as the time index and no NAs.

Monthly series. Typically "ts" series are used for monthly, quarterly or yearly series. Thus if we were to aggregate the input into months we could reasonably represent it as a "ts" series:

z.m <- as.zooreg(aggregate(z, as.yearmon, mean), freq = 12)
as.ts(z.m)

Excel VBA If cell.Value =... then

I think it would make more sense to use "Find" function in Excel instead of For Each loop. It works much much faster and it's designed for such actions. Try this:

 Sub FindSomeCells(strSearchQuery As String)   

    Set SearchRange = Worksheets("Sheet1").Range("A1:A100")
    FindWhat = strSearchQuery
    Set FoundCells = FindAll(SearchRange:=SearchRange, _
                            FindWhat:=FindWhat, _
                            LookIn:=xlValues, _
                            LookAt:=xlWhole, _
                            SearchOrder:=xlByColumns, _
                            MatchCase:=False, _
                            BeginsWith:=vbNullString, _
                            EndsWith:=vbNullString, _
                            BeginEndCompare:=vbTextCompare)
    If FoundCells Is Nothing Then
        Debug.Print "Value Not Found"
    Else
        For Each FoundCell In FoundCells
            FoundCell.Interior.Color = XlRgbColor.rgbLightGreen
        Next FoundCell
    End If

End Sub

That subroutine searches for some string and returns a collections of cells fullfilling your search criteria. Then you can do whatever you want with the cells in that collection. Forgot to add the FindAll function definition:

Function FindAll(SearchRange As Range, _
                FindWhat As Variant, _
               Optional LookIn As XlFindLookIn = xlValues, _
                Optional LookAt As XlLookAt = xlWhole, _
                Optional SearchOrder As XlSearchOrder = xlByRows, _
                Optional MatchCase As Boolean = False, _
                Optional BeginsWith As String = vbNullString, _
                Optional EndsWith As String = vbNullString, _
                Optional BeginEndCompare As VbCompareMethod = vbTextCompare) As Range
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' FindAll
' This searches the range specified by SearchRange and returns a Range object
' that contains all the cells in which FindWhat was found. The search parameters to
' this function have the same meaning and effect as they do with the
' Range.Find method. If the value was not found, the function return Nothing. If
' BeginsWith is not an empty string, only those cells that begin with BeginWith
' are included in the result. If EndsWith is not an empty string, only those cells
' that end with EndsWith are included in the result. Note that if a cell contains
' a single word that matches either BeginsWith or EndsWith, it is included in the
' result.  If BeginsWith or EndsWith is not an empty string, the LookAt parameter
' is automatically changed to xlPart. The tests for BeginsWith and EndsWith may be
' case-sensitive by setting BeginEndCompare to vbBinaryCompare. For case-insensitive
' comparisons, set BeginEndCompare to vbTextCompare. If this parameter is omitted,
' it defaults to vbTextCompare. The comparisons for BeginsWith and EndsWith are
' in an OR relationship. That is, if both BeginsWith and EndsWith are provided,
' a match if found if the text begins with BeginsWith OR the text ends with EndsWith.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

Dim FoundCell As Range
Dim FirstFound As Range
Dim LastCell As Range
Dim ResultRange As Range
Dim XLookAt As XlLookAt
Dim Include As Boolean
Dim CompMode As VbCompareMethod
Dim Area As Range
Dim MaxRow As Long
Dim MaxCol As Long
Dim BeginB As Boolean
Dim EndB As Boolean
CompMode = BeginEndCompare
If BeginsWith <> vbNullString Or EndsWith <> vbNullString Then
    XLookAt = xlPart
Else
    XLookAt = LookAt
End If
' this loop in Areas is to find the last cell
' of all the areas. That is, the cell whose row
' and column are greater than or equal to any cell
' in any Area.

For Each Area In SearchRange.Areas
    With Area
        If .Cells(.Cells.Count).Row > MaxRow Then
            MaxRow = .Cells(.Cells.Count).Row
        End If
        If .Cells(.Cells.Count).Column > MaxCol Then
            MaxCol = .Cells(.Cells.Count).Column
        End If
    End With
Next Area
Set LastCell = SearchRange.Worksheet.Cells(MaxRow, MaxCol)
On Error GoTo 0
Set FoundCell = SearchRange.Find(what:=FindWhat, _
        after:=LastCell, _
        LookIn:=LookIn, _
        LookAt:=XLookAt, _
        SearchOrder:=SearchOrder, _
        MatchCase:=MatchCase)
If Not FoundCell Is Nothing Then
    Set FirstFound = FoundCell
    Do Until False ' Loop forever. We'll "Exit Do" when necessary.
        Include = False
        If BeginsWith = vbNullString And EndsWith = vbNullString Then
            Include = True
        Else
            If BeginsWith <> vbNullString Then
                If StrComp(Left(FoundCell.Text, Len(BeginsWith)), BeginsWith, BeginEndCompare) = 0 Then
                    Include = True
                End If
            End If
            If EndsWith <> vbNullString Then
                If StrComp(Right(FoundCell.Text, Len(EndsWith)), EndsWith, BeginEndCompare) = 0 Then
                    Include = True
                End If
            End If
        End If
        If Include = True Then
            If ResultRange Is Nothing Then
                Set ResultRange = FoundCell
            Else
                Set ResultRange = Application.Union(ResultRange, FoundCell)
            End If
        End If
        Set FoundCell = SearchRange.FindNext(after:=FoundCell)
        If (FoundCell Is Nothing) Then
            Exit Do
        End If
        If (FoundCell.Address = FirstFound.Address) Then
            Exit Do
        End If
    Loop
End If
Set FindAll = ResultRange
End Function

Exception in thread "main" java.lang.Error: Unresolved compilation problems

Check Following : 1) Package names 2) Import Statements (import every required packages) 3) Proper set of braces ,i.e { } 4) Check Syntax too.. i.e semicolons,commas,etc.

RSA Public Key format

Reference Decoder of CRL,CRT,CSR,NEW CSR,PRIVATE KEY, PUBLIC KEY,RSA,RSA Public Key Parser

RSA Public Key

-----BEGIN RSA PUBLIC KEY-----
-----END RSA PUBLIC KEY-----

Encrypted Private Key

-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
-----END RSA PRIVATE KEY-----

CRL

-----BEGIN X509 CRL-----
-----END X509 CRL-----

CRT

-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----

CSR

-----BEGIN CERTIFICATE REQUEST-----
-----END CERTIFICATE REQUEST-----

NEW CSR

-----BEGIN NEW CERTIFICATE REQUEST-----
-----END NEW CERTIFICATE REQUEST-----

PEM

-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----

PKCS7

-----BEGIN PKCS7-----
-----END PKCS7-----

PRIVATE KEY

-----BEGIN PRIVATE KEY-----
-----END PRIVATE KEY-----

DSA KEY

-----BEGIN DSA PRIVATE KEY-----
-----END DSA PRIVATE KEY-----

Elliptic Curve

-----BEGIN EC PRIVATE KEY-----
-----END EC PRIVATE KEY-----

PGP Private Key

-----BEGIN PGP PRIVATE KEY BLOCK-----
-----END PGP PRIVATE KEY BLOCK-----

PGP Public Key

-----BEGIN PGP PUBLIC KEY BLOCK-----
-----END PGP PUBLIC KEY BLOCK-----

Difference between adjustResize and adjustPan in android?

As doc says also keep in mind the correct value combination:

The setting must be one of the values listed in the following table, or a combination of one "state..." value plus one "adjust..." value. Setting multiple values in either group — multiple "state..." values, for example — has undefined results. Individual values are separated by a vertical bar (|). For example:

<activity android:windowSoftInputMode="stateVisible|adjustResize" . . . >

Uploading Files in ASP.net without using the FileUpload server control

You'll have to set the enctype attribute of the form to multipart/form-data; then you can access the uploaded file using the HttpRequest.Files collection.

Greater than less than, python

Check to make sure that both score and array[x] are numerical types. You might be comparing an integer to a string...which is heartbreakingly possible in Python 2.x.

>>> 2 < "2"
True
>>> 2 > "2"
False
>>> 2 == "2"
False

Edit

Further explanation: How does Python compare string and int?

Enum to String C++

enum Enum{ Banana, Orange, Apple } ;
static const char * EnumStrings[] = { "bananas & monkeys", "Round and orange", "APPLE" };

const char * getTextForEnum( int enumVal )
{
  return EnumStrings[enumVal];
}

How to properly use unit-testing's assertRaises() with NoneType objects?

If you are using python2.7 or above you can use the ability of assertRaises to be use as a context manager and do:

with self.assertRaises(TypeError):
    self.testListNone[:1]

If you are using python2.6 another way beside the one given until now is to use unittest2 which is a back port of unittest new feature to python2.6, and you can make it work using the code above.

N.B: I'm a big fan of the new feature (SkipTest, test discovery ...) of unittest so I intend to use unittest2 as much as I can. I advise to do the same because there is a lot more than what unittest come with in python2.6 <.

Difference between margin and padding?

Padding is the space between nearest components on the web page and margin is the space from the margin of the webpage.

How to compare different branches in Visual Studio Code

Use the Git History Diff plugin for easy side-by-side branch diffing:

https://marketplace.visualstudio.com/items?itemName=huizhou.githd

Visit the link above and scroll down to the animated GIF image titled Diff Branch. You'll see you can easily pick any branch and do side-by-side comparison with the branch you are on! It is like getting a preview of what you will see in the GitHub Pull Request. For other Git stuff I prefer Visual Studio Code's built-in functionality or Git Lens as others have mentioned.

However, the above plugin is outstanding for doing branch diffing (i.e., for those doing a rebase Git flow and need to preview before a force push up to a GitHub PR).

How to see if an object is an array without using reflection?

Simply obj instanceof Object[] (tested on JShell).

How to import multiple csv files in a single load?

Reader's Digest: (Spark 2.x)

For Example, if you have 3 directories holding csv files:

dir1, dir2, dir3

You then define paths as a string of comma delimited list of paths as follows:

paths = "dir1/,dir2/,dir3/*"

Then use the following function and pass it this paths variable

def get_df_from_csv_paths(paths):

        df = spark.read.format("csv").option("header", "false").\
            schema(custom_schema).\
            option('delimiter', '\t').\
            option('mode', 'DROPMALFORMED').\
            load(paths.split(','))
        return df

By then running:

df = get_df_from_csv_paths(paths)

You will obtain in df a single spark dataframe containing the data from all the csvs found in these 3 directories.

===========================================================================

Full Version:

In case you want to ingest multiple CSVs from multiple directories you simply need to pass a list and use wildcards.

For Example:

if your data_path looks like this:

's3://bucket_name/subbucket_name/2016-09-*/184/*,
s3://bucket_name/subbucket_name/2016-10-*/184/*,
s3://bucket_name/subbucket_name/2016-11-*/184/*,
s3://bucket_name/subbucket_name/2016-12-*/184/*, ... '

you can use the above function to ingest all the csvs in all these directories and subdirectories at once:

This would ingest all directories in s3 bucket_name/subbucket_name/ according to the wildcard patterns specified. e.g. the first pattern would look in

bucket_name/subbucket_name/

for all directories with names starting with

2016-09-

and for each of those take only the directory named

184

and within that subdirectory look for all csv files.

And this would be executed for each of the patterns in the comma delimited list.

This works way better than union..

How to refactor Node.js code that uses fs.readFileSync() into using fs.readFile()?

var fs = require("fs");
var filename = "./index.html";

function start(resp) {
    resp.writeHead(200, {
        "Content-Type": "text/html"
    });
    fs.readFile(filename, "utf8", function(err, data) {
        if (err) throw err;
        resp.write(data);
        resp.end();
    });
}

Asynchronous method call in Python?

Just

import threading, time

def f():
    print "f started"
    time.sleep(3)
    print "f finished"

threading.Thread(target=f).start()

android ellipsize multiline textview

Got this problem to, and finaly, I build myself a short solution. You just have to ellipsize manually the line you want, your maxLine attribute will cut your text.

This example cut your text for 3 lines max

        final TextView title = (TextView)findViewById(R.id.text);
        title.setText("A really long text");
        ViewTreeObserver vto = title.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {
                ViewTreeObserver obs = title.getViewTreeObserver();
                obs.removeGlobalOnLayoutListener(this);
                if(title.getLineCount() > 3){
                    Log.d("","Line["+title.getLineCount()+"]"+title.getText());
                    int lineEndIndex = title.getLayout().getLineEnd(2);
                    String text = title.getText().subSequence(0, lineEndIndex-3)+"...";
                    title.setText(text);
                    Log.d("","NewText:"+text);
                }

            }
        });

Get the key corresponding to the minimum value within a dictionary

Here's an answer that actually gives the solution the OP asked for:

>>> d = {320:1, 321:0, 322:3}
>>> d.items()
[(320, 1), (321, 0), (322, 3)]
>>> # find the minimum by comparing the second element of each tuple
>>> min(d.items(), key=lambda x: x[1]) 
(321, 0)

Using d.iteritems() will be more efficient for larger dictionaries, however.

BeautifulSoup: extract text from anchor tag

print(link_addres.contents[0])

It will print the context of the anchor tags

example:

 statement_title = statement.find('h2',class_='briefing-statement__title')
 statement_title_text = statement_title.a.contents[0]

No submodule mapping found in .gitmodule for a path that's not a submodule

Usually, git creates a hidden directory in project's root directory (.git/)

When you're working on a CMS, its possible you install modules/plugins carrying .git/ directory with git's metadata for the specific module/plugin

Quickest solution is to find all .git directories and keep only your root git metadata directory. If you do so, git will not consider those modules as project submodules.

Change Circle color of radio button

<RadioButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/radio"
    android:buttonTint="@color/my_color"/>

All button will change color, the circle box and the central check.

How do I create a unique constraint that also allows nulls?

CREATE UNIQUE NONCLUSTERED INDEX [UIX_COLUMN_NAME]
ON [dbo].[Employee]([Username] ASC) WHERE ([Username] IS NOT NULL) 
WITH (ALLOW_PAGE_LOCKS = ON, ALLOW_ROW_LOCKS = ON, PAD_INDEX = OFF, SORT_IN_TEMPDB = OFF, 
DROP_EXISTING = OFF, IGNORE_DUP_KEY = OFF, STATISTICS_NORECOMPUTE = OFF, ONLINE = OFF, 
MAXDOP = 0) ON [PRIMARY];

Nested objects in javascript, best practices

If you know the settings in advance you can define it in a single statement:

var defaultsettings = {
                        ajaxsettings : { "ak1" : "v1", "ak2" : "v2", etc. },
                        uisettings : { "ui1" : "v1", "ui22" : "v2", etc }
                      };

If you don't know the values in advance you can just define the top level object and then add properties:

var defaultsettings = { };
defaultsettings["ajaxsettings"] = {};
defaultsettings["ajaxsettings"]["somekey"] = "some value";

Or half-way between the two, define the top level with nested empty objects as properties and then add properties to those nested objects:

var defaultsettings = {
                        ajaxsettings : {  },
                        uisettings : {  }
                      };

defaultsettings["ajaxsettings"]["somekey"] = "some value";
defaultsettings["uisettings"]["somekey"] = "some value";

You can nest as deep as you like using the above techniques, and anywhere that you have a string literal in the square brackets you can use a variable:

var keyname = "ajaxsettings";
var defaultsettings = {};
defaultsettings[keyname] = {};
defaultsettings[keyname]["some key"] = "some value";

Note that you can not use variables for key names in the { } literal syntax.

Check substring exists in a string in C

#include <stdio.h>
#include <string.h>

int findSubstr(char *inpText, char *pattern);
int main()
{
    printf("Hello, World!\n");
    char *Text = "This is my sample program";
    char *pattern = "sample";
    int pos = findSubstr(Text, pattern);
    if (pos > -1) {
        printf("Found the substring at position %d \n", pos);
    }
    else
        printf("No match found \n");

    return 0;
}

int findSubstr(char *inpText, char *pattern) {
    int inplen = strlen(inpText);
    while (inpText != NULL) {

        char *remTxt = inpText;
        char *remPat = pattern;

        if (strlen(remTxt) < strlen(remPat)) {
            /* printf ("length issue remTxt %s \nremPath %s \n", remTxt, remPat); */
            return -1;
        }

        while (*remTxt++ == *remPat++) {
            printf("remTxt %s \nremPath %s \n", remTxt, remPat);
            if (*remPat == '\0') {
                printf ("match found \n");
                return inplen - strlen(inpText+1);
            }
            if (remTxt == NULL) {
                return -1;
            }
        }
        remPat = pattern;

        inpText++;
    }
}

What's the purpose of META-INF?

I have been thinking about this issue recently. There really doesn't seem to be any restriction on use of META-INF. There are certain strictures, of course, about the necessity of putting the manifest there, but there don't appear to be any prohibitions about putting other stuff there.

Why is this the case?

The cxf case may be legit. Here's another place where this non-standard is recommended to get around a nasty bug in JBoss-ws that prevents server-side validation against the schema of a wsdl.

http://community.jboss.org/message/570377#570377

But there really don't seem to be any standards, any thou-shalt-nots. Usually these things are very rigorously defined, but for some reason, it seems there are no standards here. Odd. It seems like META-INF has become a catchall place for any needed configuration that can't easily be handled some other way.

How to remove the hash from window.location (URL) with JavaScript without page refresh?

Initial question:

window.location.href.substr(0, window.location.href.indexOf('#'))

or

window.location.href.split('#')[0]

both will return the URL without the hash or anything after it.

With regards to your edit:

Any change to window.location will trigger a page refresh. You can change window.location.hash without triggering the refresh (though the window will jump if your hash matches an id on the page), but you can't get rid of the hash sign. Take your pick for which is worse...

MOST UP-TO-DATE ANSWER

The right answer on how to do it without sacrificing (either full reload or leaving the hash sign there) is down here. Leaving this answer here though with respect to being the original one in 2009 whereas the correct one which leverages new browser APIs was given 1.5 years later.

How to save a dictionary to a file?

For a dictionary of strings such as the one you're dealing with, it could be done using only Python's built-in text processing capabilities.

(Note this wouldn't work if the values are something else.)

with open('members.txt') as file:
    mdict={}
    for line in file:
        a, b, c, d = line.strip().split(':')
        mdict[a] = b + ':' + c + ':' + d

a = input('ID: ')
if a not in mdict:
    print('ID {} not found'.format(a))
else:
    b, c, d = mdict[a].split(':')
    d = input('phone: ')
    mdict[a] = b + ':' + c + ':' + d  # update entry
    with open('members.txt', 'w') as file:  # rewrite file
        for id, values in mdict.items():
            file.write(':'.join([id] + values.split(':')) + '\n')

How to render html with AngularJS templates

In angular 4+ we can use innerHTML property instead of ng-bind-html.

In my case, it's working and I am using angular 5.

<div class="chart-body" [innerHTML]="htmlContent"></div>

In.ts file

let htmlContent = 'This is the `<b>Bold</b>` text.';

Where is SQL Server Management Studio 2012?

I just ran into this problem. I had to open back the installation for SQL Server and click Installation -> New SQL server installation or add features to existing installation. Then when we follow the instruction until we reach feature selection, just check the SQL Management tools checkbox and continue.

I have no idea why this software is considered a feature and hidden like this. It should be a stand-alone software installation.

Find element's index in pandas Series

Another way to do this, although equally unsatisfying is:

s = pd.Series([1,3,0,7,5],index=[0,1,2,3,4])

list(s).index(7)

returns: 3

On time tests using a current dataset I'm working with (consider it random):

[64]:    %timeit pd.Index(article_reference_df.asset_id).get_loc('100000003003614')
10000 loops, best of 3: 60.1 µs per loop

In [66]: %timeit article_reference_df.asset_id[article_reference_df.asset_id == '100000003003614'].index[0]
1000 loops, best of 3: 255 µs per loop


In [65]: %timeit list(article_reference_df.asset_id).index('100000003003614')
100000 loops, best of 3: 14.5 µs per loop

How to add a spinner icon to button when it's in the Loading state?

To make the solution by @flion look really great, you could adjust the center point for that icon so it doesn't wobble up and down. This looks right for me at a small font size:

.glyphicon-refresh.spinning {
  transform-origin: 48% 50%;
}

How to update data in one table from corresponding data in another table in SQL Server 2005

use test1

insert into employee(deptid) select deptid from test2.dbo.employee

Clear screen in shell

If you are using linux terminal to access python, then cntrl+l is the best solution to clear screen

Encrypt and Decrypt text with RSA in PHP

No application written in 2017 (or thereafter) that intends to incorporate serious cryptography should use RSA any more. There are better options for PHP public-key cryptography.

There are two big mistakes that people make when they decide to encrypt with RSA:

  1. Developers choose the wrong padding mode.
  2. Since RSA cannot, by itself, encrypt very long strings, developers will often break a string into small chunks and encrypt each chunk independently. Sort of like ECB mode.

The Best Alternative: sodium_crypto_box_seal() (libsodium)

$keypair = sodium_crypto_box_keypair();
$publicKey = sodium_crypto_box_publickey($keypair);
// ...
$encrypted = sodium_crypto_box_seal(
    $plaintextMessage,
    $publicKey
);
// ...
$decrypted = sodium_crypto_box_seal_open(
    $encrypted,
    $keypair
);

Simple and secure. Libsodium will be available in PHP 7.2, or through PECL for earlier versions of PHP. If you need a pure-PHP polyfill, get paragonie/sodium_compat.

Begrudgingly: Using RSA Properly

The only reason to use RSA in 2017 is, "I'm forbidden to install PECL extensions and therefore cannot use libsodium, and for some reason cannot use paragonie/sodium_compat either."

Your protocol should look something like this:

  1. Generate a random AES key.
  2. Encrypt your plaintext message with the AES key, using an AEAD encryption mode or, failing that, CBC then HMAC-SHA256.
  3. Encrypt your AES key (step 1) with your RSA public key, using RSAES-OAEP + MGF1-SHA256
  4. Concatenate your RSA-encrypted AES key (step 3) and AES-encrypted message (step 2).

Instead of implementing this yourself, check out EasyRSA.

Further reading: Doing RSA in PHP correctly.

Why should you use strncpy instead of strcpy?

This may be used in many other scenarios, where you need to copy only a portion of your original string to the destination. Using strncpy() you can copy a limited portion of the original string as opposed by strcpy(). I see the code you have put up comes from publib.boulder.ibm.com.

json call with C#

just continuing what @Mulki made with his code

public string WebRequestinJson(string url, string postData)
{
    string ret = string.Empty;

    StreamWriter requestWriter;

    var webRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;
    if (webRequest != null)
    {
        webRequest.Method = "POST";
        webRequest.ServicePoint.Expect100Continue = false;
        webRequest.Timeout = 20000;

        webRequest.ContentType = "application/json";
        //POST the data.
        using (requestWriter = new StreamWriter(webRequest.GetRequestStream()))
        {
            requestWriter.Write(postData);
        }
    }

    HttpWebResponse resp = (HttpWebResponse)webRequest.GetResponse();
    Stream resStream = resp.GetResponseStream();
    StreamReader reader = new StreamReader(resStream);
    ret = reader.ReadToEnd();

    return ret;
}

Allow only numbers to be typed in a textbox

You could subscribe for the onkeypress event:

<input type="text" class="textfield" value="" id="extra7" name="extra7" onkeypress="return isNumber(event)" />

and then define the isNumber function:

function isNumber(evt) {
    evt = (evt) ? evt : window.event;
    var charCode = (evt.which) ? evt.which : evt.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        return false;
    }
    return true;
}

You can see it in action here.

javascript windows alert with redirect function

Use this if you also want to consider non-javascript users:

echo ("<SCRIPT LANGUAGE='JavaScript'>
           window.alert('Succesfully Updated')
           window.location.href='http://someplace.com';
       </SCRIPT>
       <NOSCRIPT>
           <a href='http://someplace.com'>Successfully Updated. Click here if you are not redirected.</a>
       </NOSCRIPT>");

How to limit google autocomplete results to City and Country only

You can try the country restriction

function initialize() {

 var options = {
  types: ['(cities)'],
  componentRestrictions: {country: "us"}
 };

 var input = document.getElementById('searchTextField');
 var autocomplete = new google.maps.places.Autocomplete(input, options);
}

More info:

ISO 3166-1 alpha-2 can be used to restrict results to specific groups. Currently, you can use componentRestrictions to filter by country.

The country must be passed as as a two character, ISO 3166-1 Alpha-2 compatible country code.


Officially assigned country codes

Does the join order matter in SQL?

Oracle optimizer chooses join order of tables for inner join. Optimizer chooses the join order of tables only in simple FROM clauses . U can check the oracle documentation in their website. And for the left, right outer join the most voted answer is right. The optimizer chooses the optimal join order as well as the optimal index for each table. The join order can affect which index is the best choice. The optimizer can choose an index as the access path for a table if it is the inner table, but not if it is the outer table (and there are no further qualifications).

The optimizer chooses the join order of tables only in simple FROM clauses. Most joins using the JOIN keyword are flattened into simple joins, so the optimizer chooses their join order.

The optimizer does not choose the join order for outer joins; it uses the order specified in the statement.

When selecting a join order, the optimizer takes into account: The size of each table The indexes available on each table Whether an index on a table is useful in a particular join order The number of rows and pages to be scanned for each table in each join order

Check if property has attribute

You can use a common (generic) method to read attribute over a given MemberInfo

public static bool TryGetAttribute<T>(MemberInfo memberInfo, out T customAttribute) where T: Attribute {
                var attributes = memberInfo.GetCustomAttributes(typeof(T), false).FirstOrDefault();
                if (attributes == null) {
                    customAttribute = null;
                    return false;
                }
                customAttribute = (T)attributes;
                return true;
            }

How to style the option of an html "select" element?

You can style the option elements to some extent.

Using the * CSS tag you can style the options inside the box that is drawn by the system.

Example:

#ddlProducts *
{
 border-radius:15px;
 background-color:red;
}

That will look like this:

enter image description here

C# Switch-case string starting with

Try this and tell my if it works hope it help you:

string value = Convert.ToString(Console.ReadLine());

Switch(value)
{
    Case "abc":

    break;

    default:

    break;
}       

MySQL - length() vs char_length()

LENGTH() returns the length of the string measured in bytes.
CHAR_LENGTH() returns the length of the string measured in characters.

This is especially relevant for Unicode, in which most characters are encoded in two bytes. Or UTF-8, where the number of bytes varies. For example:

select length(_utf8 '€'), char_length(_utf8 '€')
--> 3, 1

As you can see the Euro sign occupies 3 bytes (it's encoded as 0xE282AC in UTF-8) even though it's only one character.

How to get date and time from server

You should set the timezone to the one of the timezones you want.

// set default timezone
date_default_timezone_set('America/Chicago'); // CDT

$info = getdate();
$date = $info['mday'];
$month = $info['mon'];
$year = $info['year'];
$hour = $info['hours'];
$min = $info['minutes'];
$sec = $info['seconds'];

$current_date = "$date/$month/$year == $hour:$min:$sec";

Or a much shorter version:

// set default timezone
date_default_timezone_set('America/Chicago'); // CDT

$current_date = date('d/m/Y == H:i:s');

What is the equivalent to getLastInsertId() in Cakephp?

Try to use this code. try to set it to a variable so you can use it in other functions. :)

$variable = $this->ModelName->getLastInsertId();

in PHP native, try this.

$variable = mysqli_insert_id();

If condition inside of map() React

If you're a minimalist like me. Say you only want to render a record with a list containing entries.

<div>
  {data.map((record) => (
    record.list.length > 0
      ? (<YourRenderComponent record={record} key={record.id} />)
      : null
  ))}
</div>

Converting DateTime format using razor

This is solution:

@item.Published.Value.ToString("dd. MM. yyyy")

Before ToString() use Value.

CSS hide scroll bar, but have element scrollable

if you really want to get rid of the scrollbar, split the information up into two separate pages.

Usability guidelines on scrollbars by Jakob Nielsen:

There are five essential usability guidelines for scrolling and scrollbars:

  • Offer a scrollbar if an area has scrolling content. Don't rely on auto-scrolling or on dragging, which people might not notice.
  • Hide scrollbars if all content is visible. If people see a scrollbar, they assume there's additional content and will be frustrated if they can't scroll.
  • Comply with GUI standards and use scrollbars that look like scrollbars.
  • Avoid horizontal scrolling on Web pages and minimize it elsewhere.
  • Display all important information above the fold. Users often decide whether to stay or leave based on what they can see without scrolling. Plus they only allocate 20% of their attention below the fold.

To make your scrollbar only visible when it is needed (i.e. when there is content to scroll down to), use overflow: auto.

how to bold words within a paragraph in HTML/CSS?

<style type="text/css">
p.boldpara {font-weight:bold;}
</style>
</head>

<body>
<p class="boldpara">Stack overflow is good site for developers. I really like this site </p>

</body>

</html>

http://www.tutorialspoint.com

Why is "1000000000000000 in range(1000000000000001)" so fast in Python 3?

TL;DR

The object returned by range() is actually a range object. This object implements the iterator interface so you can iterate over its values sequentially, just like a generator, list, or tuple.

But it also implements the __contains__ interface which is actually what gets called when an object appears on the right hand side of the in operator. The __contains__() method returns a bool of whether or not the item on the left-hand-side of the in is in the object. Since range objects know their bounds and stride, this is very easy to implement in O(1).

How to initialize all members of an array to the same value?

  1. If your array is declared as static or is global, all the elements in the array already have default default value 0.
  2. Some compilers set array's the default to 0 in debug mode.
  3. It is easy to set default to 0 : int array[10] = {0};
  4. However, for other values, you have use memset() or loop;

example: int array[10]; memset(array,-1, 10 *sizeof(int));

How to delete a file via PHP?

You can delete the file using

unlink($Your_file_path);

but if you are deleting a file from it's http path then this unlink is not work proper. You have to give a file path correct.

Gmail: 530 5.5.1 Authentication Required. Learn more at

in may case setting SMTPAuth to true fixed it. Of-course you need to set permissions for "Less secure apps" to Enabled.

$mail->SMTPAuth = true;

Design DFA accepting binary strings divisible by a number 'n'

Below, I have written an answer for n equals to 5, but you can apply same approach to draw DFAs for any value of n and 'any positional number system' e.g binary, ternary...

First lean the term 'Complete DFA', A DFA defined on complete domain in d:Q × S?Q is called 'Complete DFA'. In other words we can say; in transition diagram of complete DFA there is no missing edge (e.g. from each state in Q there is one outgoing edge present for every language symbol in S). Note: Sometime we define partial DFA as d ? Q × S?Q (Read: How does “d:Q × S?Q” read in the definition of a DFA).

Design DFA accepting Binary numbers divisible by number 'n':

Step-1: When you divide a number ? by n then reminder can be either 0, 1, ..., (n - 2) or (n - 1). If remainder is 0 that means ? is divisible by n otherwise not. So, in my DFA there will be a state qr that would be corresponding to a remainder value r, where 0 <= r <= (n - 1), and total number of states in DFA is n.
After processing a number string ? over S, the end state is qr implies that ? % n => r (% reminder operator).

In any automata, the purpose of a state is like memory element. A state in an atomata stores some information like fan's switch that can tell whether the fan is in 'off' or in 'on' state. For n = 5, five states in DFA corresponding to five reminder information as follows:

  1. State q0 reached if reminder is 0. State q0 is the final state(accepting state). It is also an initial state.
  2. State q1 reaches if reminder is 1, a non-final state.
  3. State q2 if reminder is 2, a non-final state.
  4. State q3 if reminder is 3, a non-final state.
  5. State q4 if reminder is 4, a non-final state.

Using above information, we can start drawing transition diagram TD of five states as follows:

fig-1
Figure-1

So, 5 states for 5 remainder values. After processing a string ? if end-state becomes q0 that means decimal equivalent of input string is divisible by 5. In above figure q0 is marked final state as two concentric circle.
Additionally, I have defined a transition rule d:(q0, 0)?q0 as a self loop for symbol '0' at state q0, this is because decimal equivalent of any string consist of only '0' is 0 and 0 is a divisible by n.

Step-2: TD above is incomplete; and can only process strings of '0's. Now add some more edges so that it can process subsequent number's strings. Check table below, shows new transition rules those can be added next step:

+-------------------------------------+
¦Number¦Binary¦Remainder(%5)¦End-state¦
+------+------+-------------+---------¦
¦One   ¦1     ¦1            ¦q1       ¦
+------+------+-------------+---------¦
¦Two   ¦10    ¦2            ¦q2       ¦
+------+------+-------------+---------¦
¦Three ¦11    ¦3            ¦q3       ¦
+------+------+-------------+---------¦
¦Four  ¦100   ¦4            ¦q4       ¦
+-------------------------------------+
  1. To process binary string '1' there should be a transition rule d:(q0, 1)?q1
  2. Two:- binary representation is '10', end-state should be q2, and to process '10', we just need to add one more transition rule d:(q1, 0)?q2
    Path: ?(q0)-1?(q1)-0?(q2)
  3. Three:- in binary it is '11', end-state is q3, and we need to add a transition rule d:(q1, 1)?q3
    Path: ?(q0)-1?(q1)-1?(q3)
  4. Four:- in binary '100', end-state is q4. TD already processes prefix string '10' and we just need to add a new transition rule d:(q2, 0)?q4
    Path: ?(q0)-1?(q1)-0?(q2)-0?(q4)

fig-2 Figure-2

Step-3: Five = 101
Above transition diagram in figure-2 is still incomplete and there are many missing edges, for an example no transition is defined for d:(q2, 1)-?. And the rule should be present to process strings like '101'.
Because '101' = 5 is divisible by 5, and to accept '101' I will add d:(q2, 1)?q0 in above figure-2.
Path: ?(q0)-1?(q1)-0?(q2)-1?(q0)
with this new rule, transition diagram becomes as follows:

fig-3 Figure-3

Below in each step I pick next subsequent binary number to add a missing edge until I get TD as a 'complete DFA'.

Step-4: Six = 110.

We can process '11' in present TD in figure-3 as: ?(q0)-11?(q3) -0?(?). Because 6 % 5 = 1 this means to add one rule d:(q3, 0)?q1.

fig-4 Figure-4

Step-5: Seven = 111

+--------------------------------------------------------------+
¦Number¦Binary¦Remainder(%5)¦End-state¦ Path       ¦ Add       ¦
+------+------+-------------+---------+------------+-----------¦
¦Seven ¦111   ¦7 % 5 = 2    ¦q2       ¦ q0-11?q3   ¦ q3-1?q2    ¦
+--------------------------------------------------------------+

fig-5 Figure-5

Step-6: Eight = 1000

+----------------------------------------------------------+
¦Number¦Binary¦Remainder(%5)¦End-state¦ Path     ¦ Add     ¦
+------+------+-------------+---------+----------+---------¦
¦Eight ¦1000  ¦8 % 5 = 3    ¦q3       ¦q0-100?q4 ¦ q4-0?q3  ¦
+----------------------------------------------------------+

fig-6 Figure-6

Step-7: Nine = 1001

+----------------------------------------------------------+
¦Number¦Binary¦Remainder(%5)¦End-state¦ Path     ¦ Add     ¦
+------+------+-------------+---------+----------+---------¦
¦Nine  ¦1001  ¦9 % 5 = 4    ¦q4       ¦q0-100?q4 ¦ q4-1?q4  ¦
+----------------------------------------------------------+

fig-7 Figure-7

In TD-7, total number of edges are 10 == Q × S = 5 × 2. And it is a complete DFA that can accept all possible binary strings those decimal equivalent is divisible by 5.

Design DFA accepting Ternary numbers divisible by number n:

Step-1 Exactly same as for binary, use figure-1.

Step-2 Add Zero, One, Two

+------------------------------------------------------+
¦Decimal¦Ternary¦Remainder(%5)¦End-state¦   Add        ¦
+-------+-------+-------------+---------+--------------¦
¦Zero   ¦0      ¦0            ¦q0       ¦ d:(q0,0)?q0  ¦
+-------+-------+-------------+---------+--------------¦
¦One    ¦1      ¦1            ¦q1       ¦ d:(q0,1)?q1  ¦
+-------+-------+-------------+---------+--------------¦
¦Two    ¦2      ¦2            ¦q2       ¦ d:(q0,2)?q3  ¦
+------------------------------------------------------+

fig-8
Figure-8

Step-3 Add Three, Four, Five

+-----------------------------------------------------+
¦Decimal¦Ternary¦Remainder(%5)¦End-state¦  Add        ¦
+-------+-------+-------------+---------+-------------¦
¦Three  ¦10     ¦3            ¦q3       ¦ d:(q1,0)?q3 ¦
+-------+-------+-------------+---------+-------------¦
¦Four   ¦11     ¦4            ¦q4       ¦ d:(q1,1)?q4 ¦
+-------+-------+-------------+---------+-------------¦
¦Five   ¦12     ¦0            ¦q0       ¦ d:(q1,2)?q0 ¦
+-----------------------------------------------------+

fig-9
Figure-9

Step-4 Add Six, Seven, Eight

+-----------------------------------------------------+
¦Decimal¦Ternary¦Remainder(%5)¦End-state¦  Add        ¦
+-------+-------+-------------+---------+-------------¦
¦Six    ¦20     ¦1            ¦q1       ¦ d:(q2,0)?q1 ¦
+-------+-------+-------------+---------+-------------¦
¦Seven  ¦21     ¦2            ¦q2       ¦ d:(q2,1)?q2 ¦
+-------+-------+-------------+---------+-------------¦
¦Eight  ¦22     ¦3            ¦q3       ¦ d:(q2,2)?q3 ¦
+-----------------------------------------------------+

fig-10
Figure-10

Step-5 Add Nine, Ten, Eleven

+-----------------------------------------------------+
¦Decimal¦Ternary¦Remainder(%5)¦End-state¦  Add        ¦
+-------+-------+-------------+---------+-------------¦
¦Nine   ¦100    ¦4            ¦q4       ¦ d:(q3,0)?q4 ¦
+-------+-------+-------------+---------+-------------¦
¦Ten    ¦101    ¦0            ¦q0       ¦ d:(q3,1)?q0 ¦
+-------+-------+-------------+---------+-------------¦
¦Eleven ¦102    ¦1            ¦q1       ¦ d:(q3,2)?q1 ¦
+-----------------------------------------------------+

fig-11
Figure-11

Step-6 Add Twelve, Thirteen, Fourteen

+------------------------------------------------------+
¦Decimal ¦Ternary¦Remainder(%5)¦End-state¦  Add        ¦
+--------+-------+-------------+---------+-------------¦
¦Twelve  ¦110    ¦2            ¦q2       ¦ d:(q4,0)?q2 ¦
+--------+-------+-------------+---------+-------------¦
¦Thirteen¦111    ¦3            ¦q3       ¦ d:(q4,1)?q3 ¦
+--------+-------+-------------+---------+-------------¦
¦Fourteen¦112    ¦4            ¦q4       ¦ d:(q4,2)?q4 ¦
+------------------------------------------------------+

fig-12
Figure-12

Total number of edges in transition diagram figure-12 are 15 = Q × S = 5 * 3 (a complete DFA). And this DFA can accept all strings consist over {0, 1, 2} those decimal equivalent is divisible by 5.
If you notice at each step, in table there are three entries because at each step I add all possible outgoing edge from a state to make a complete DFA (and I add an edge so that qr state gets for remainder is r)!

To add further, remember union of two regular languages are also a regular. If you need to design a DFA that accepts binary strings those decimal equivalent is either divisible by 3 or 5, then draw two separate DFAs for divisible by 3 and 5 then union both DFAs to construct target DFA (for 1 <= n <= 10 your have to union 10 DFAs).

If you are asked to draw DFA that accepts binary strings such that decimal equivalent is divisible by 5 and 3 both then you are looking for DFA of divisible by 15 ( but what about 6 and 8?).

Note: DFAs drawn with this technique will be minimized DFA only when there is no common factor between number n and base e.g. there is no between 5 and 2 in first example, or between 5 and 3 in second example, hence both DFAs constructed above are minimized DFAs. If you are interested to read further about possible mini states for number n and base b read paper: Divisibility and State Complexity.

below I have added a Python script, I written it for fun while learning Python library pygraphviz. I am adding it I hope it can be helpful for someone in someway.

Design DFA for base 'b' number strings divisible by number 'n':

So we can apply above trick to draw DFA to recognize number strings in any base 'b' those are divisible a given number 'n'. In that DFA total number of states will be n (for n remainders) and number of edges should be equal to 'b' * 'n' — that is complete DFA: 'b' = number of symbols in language of DFA and 'n' = number of states.

Using above trick, below I have written a Python Script to Draw DFA for input base and number. In script, function divided_by_N populates DFA's transition rules in base * number steps. In each step-num, I convert num into number string num_s using function baseN(). To avoid processing each number string, I have used a temporary data-structure lookup_table. In each step, end-state for number string num_s is evaluated and stored in lookup_table to use in next step.

For transition graph of DFA, I have written a function draw_transition_graph using Pygraphviz library (very easy to use). To use this script you need to install graphviz. To add colorful edges in transition diagram, I randomly generates color codes for each symbol get_color_dict function.

#!/usr/bin/env python
import pygraphviz as pgv
from pprint import pprint
from random import choice as rchoice

def baseN(n, b, syms="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
    """ converts a number `n` into base `b` string """
    return ((n == 0) and syms[0]) or (
        baseN(n//b, b, syms).lstrip(syms[0]) + syms[n % b])

def divided_by_N(number, base):
    """
    constructs DFA that accepts given `base` number strings
    those are divisible by a given `number`
    """
    ACCEPTING_STATE = START_STATE = '0'
    SYMBOL_0 = '0'
    dfa = {
        str(from_state): {
            str(symbol): 'to_state' for symbol in range(base)
        }
        for from_state in range(number)
    }
    dfa[START_STATE][SYMBOL_0] = ACCEPTING_STATE
    # `lookup_table` keeps track: 'number string' -->[dfa]--> 'end_state'
    lookup_table = { SYMBOL_0: ACCEPTING_STATE }.setdefault
    for num in range(number * base):
        end_state = str(num % number)
        num_s = baseN(num, base)
        before_end_state = lookup_table(num_s[:-1], START_STATE)
        dfa[before_end_state][num_s[-1]] = end_state
        lookup_table(num_s, end_state)
    return dfa

def symcolrhexcodes(symbols):
    """
    returns dict of color codes mapped with alphabets symbol in symbols
    """
    return {
        symbol: '#'+''.join([
            rchoice("8A6C2B590D1F4E37") for _ in "FFFFFF"
        ])
        for symbol in symbols
    }

def draw_transition_graph(dfa, filename="filename"):
    ACCEPTING_STATE = START_STATE = '0'
    colors = symcolrhexcodes(dfa[START_STATE].keys())
    # draw transition graph
    tg = pgv.AGraph(strict=False, directed=True, decorate=True)
    for from_state in dfa:
        for symbol, to_state in dfa[from_state].iteritems():
            tg.add_edge("Q%s"%from_state, "Q%s"%to_state,
                        label=symbol, color=colors[symbol],
                        fontcolor=colors[symbol])

    # add intial edge from an invisible node!
    tg.add_node('null', shape='plaintext', label='start')
    tg.add_edge('null', "Q%s"%START_STATE,)

    # make end acception state as 'doublecircle'
    tg.get_node("Q%s"%ACCEPTING_STATE).attr['shape'] = 'doublecircle'
    tg.draw(filename, prog='circo')
    tg.close()

def print_transition_table(dfa):
    print("DFA accepting number string in base '%(base)s' "
            "those are divisible by '%(number)s':" % {
                'base': len(dfa['0']),
                'number': len(dfa),})
    pprint(dfa)

if __name__ == "__main__":
    number = input ("Enter NUMBER: ")
    base = input ("Enter BASE of number system: ")
    dfa = divided_by_N(number, base)

    print_transition_table(dfa)
    draw_transition_graph(dfa)

Execute it:

~/study/divide-5/script$ python script.py 
Enter NUMBER: 5
Enter BASE of number system: 4
DFA accepting number string in base '4' those are divisible by '5':
{'0': {'0': '0', '1': '1', '2': '2', '3': '3'},
 '1': {'0': '4', '1': '0', '2': '1', '3': '2'},
 '2': {'0': '3', '1': '4', '2': '0', '3': '1'},
 '3': {'0': '2', '1': '3', '2': '4', '3': '0'},
 '4': {'0': '1', '1': '2', '2': '3', '3': '4'}}
~/study/divide-5/script$ ls
script.py filename.png
~/study/divide-5/script$ display filename

Output:

base_4_divided_5_best
DFA accepting number strings in base 4 those are divisible by 5

Similarly, enter base = 4 and number = 7 to generate - dfa accepting number string in base '4' those are divisible by '7'
Btw, try changing filename to .png or .jpeg.

References those I use to write this script:
➊ Function baseN from "convert integer to a string in a given numeric base in python"
➋ To install "pygraphviz": "Python does not see pygraphviz"
➌ To learn use of Pygraphviz: "Python-FSM"
➍ To generate random hex color codes for each language symbol: "How would I make a random hexdigit code generator using .join and for loops?"

Why I can't access remote Jupyter Notebook server?

I managed to get the access my local server by ip using the command shown below:

jupyter notebook --ip xx.xx.xx.xx --port 8888

replace the xx.xx.xx.xx by your local ip of the jupyter server.

Bind service to activity in Android

First of all, 2 thing that we need to understand

Client

  • it make request to specific server

    bindService(new 
        Intent("com.android.vending.billing.InAppBillingService.BIND"),
            mServiceConn, Context.BIND_AUTO_CREATE);`
    

here mServiceConn is instance of ServiceConnection class(inbuilt) it is actually interface that we need to implement with two (1st for network connected and 2nd network not connected) method to monitor network connection state.

Server

  • It handle the request of client and make replica of it's own which is private to client only who send request and this replica of server runs on different thread.

Now at client side, how to access all the method of server?

  • server send response with IBind Object.so IBind object is our handler which access all the method of service by using (.) operator.

    MyService myService;
    public ServiceConnection myConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder binder) {
            Log.d("ServiceConnection","connected");
            myService = binder;
        }
        //binder comes from server to communicate with method's of 
    
        public void onServiceDisconnected(ComponentName className) {
            Log.d("ServiceConnection","disconnected");
            myService = null;
        }
    }
    

now how to call method which lies in service

myservice.serviceMethod();

here myService is object and serviceMethode is method in service. And by this way communication is established between client and server.

Quickest way to convert a base 10 number to any base in .NET?

I recently blogged about this. My implementation does not use any string operations during the calculations, which makes it very fast. Conversion to any numeral system with base from 2 to 36 is supported:

/// <summary>
/// Converts the given decimal number to the numeral system with the
/// specified radix (in the range [2, 36]).
/// </summary>
/// <param name="decimalNumber">The number to convert.</param>
/// <param name="radix">The radix of the destination numeral system (in the range [2, 36]).</param>
/// <returns></returns>
public static string DecimalToArbitrarySystem(long decimalNumber, int radix)
{
    const int BitsInLong = 64;
    const string Digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    if (radix < 2 || radix > Digits.Length)
        throw new ArgumentException("The radix must be >= 2 and <= " + Digits.Length.ToString());

    if (decimalNumber == 0)
        return "0";

    int index = BitsInLong - 1;
    long currentNumber = Math.Abs(decimalNumber);
    char[] charArray = new char[BitsInLong];

    while (currentNumber != 0)
    {
        int remainder = (int)(currentNumber % radix);
        charArray[index--] = Digits[remainder];
        currentNumber = currentNumber / radix;
    }

    string result = new String(charArray, index + 1, BitsInLong - index - 1);
    if (decimalNumber < 0)
    {
        result = "-" + result;
    }

    return result;
}

I've also implemented a fast inverse function in case anyone needs it too: Arbitrary to Decimal Numeral System.

How to add System.Windows.Interactivity to project?

Alternative solution is to modify your current Visual Studio installation in the Visual Studio Installer

Win+R %ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vs_installer.exe

adding the Blend for Visual Studio SDK for .NET 'Individual component' under 'SDKs, libraries, and frameworks':

enter image description here after adding this component System.Windows.Interactivity should appear in its regular location Add Reference/Assemblies/Extensions.


It appears this would only work for VS2017 or earlier. For later versions, please refer to other answers.

Download a file by jQuery.Ajax

Use window.open https://developer.mozilla.org/en-US/docs/Web/API/Window/open

For example, you can put this line of code in a click handler:

window.open('/file.txt', '_blank');

It will open a new tab (because of the '_blank' window-name) and that tab will open the URL.

Your server-side code should also have something like this:

res.set('Content-Disposition', 'attachment; filename=file.txt');

And that way, the browser should prompt the user to save the file to disk, instead of just showing them the file. It will also automatically close the tab that it just opened.

How to check if string contains Latin characters only?

Ahh, found the answer myself:

if (/[a-zA-Z]/.test(num)) {
  alert('Letter Found')
}

Java random number with given length

To generate a 6-digit number:

Use Random and nextInt as follows:

Random rnd = new Random();
int n = 100000 + rnd.nextInt(900000);

Note that n will never be 7 digits (1000000) since nextInt(900000) can at most return 899999.

So how do I randomize the last 5 chars that can be either A-Z or 0-9?

Here's a simple solution:

// Generate random id, for example 283952-V8M32
char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();
Random rnd = new Random();
StringBuilder sb = new StringBuilder((100000 + rnd.nextInt(900000)) + "-");
for (int i = 0; i < 5; i++)
    sb.append(chars[rnd.nextInt(chars.length)]);

return sb.toString();

PHP: How to get current time in hour:minute:second?

Anytime you have a question about a particular function in PHP, the easiest way to get quick answers is by visiting php.net, which has great documentation on all of the language's capabilities.

Looking up a function is easy, just visit http://php.net/<function name> and it will forward you to the appropriate place. For the date function, we'll visit http://php.net/date.

We immediately learn a couple things about this function by examining its signature:

string date ( string $format [, int $timestamp = time() ] )

First, it returns a string. That's what the first string in the above code means. Secondly, the first parameter is expected to be a string containing the format. There is an optional second parameter for passing in your own timestamp (to construct strings from some time other than now).

date("d-m-Y") // produces something like 03-12-2012

In this code, d represents the day of the month (with a leading 0 is necessary). m represents the month, again with a leading zero if necessary. And Y represents the full 4-digit year. All of these are documented in the aforementioned link.

To satisfy your request of getting the hours, minutes, and seconds, we need to give a quick look at the documentation to see which characters represents those particular units of time. When we do that, we find the following:

h   12-hour format of an hour with leading zeros    01 through 12
i   Minutes with leading zeros                      00 to 59
s   Seconds, with leading zeros                     00 through 59

With this in mind, we can no create a new format string:

date("d-m-Y h:i:s"); // produces something like 03-12-2012 03:29:13

Hope this is helpful, and I hope you find the documentation has benefiting to your development as I have to mine.

String Comparison in Java

The String.compareTo(..) method performs lexicographical comparison. Lexicographically == alphebetically.

GCC: array type has incomplete element type

It's the array that's causing trouble in:

void print_graph(g_node graph_node[], double weight[][], int nodes);

The second and subsequent dimensions must be given:

void print_graph(g_node graph_node[], double weight[][32], int nodes);

Or you can just give a pointer to pointer:

void print_graph(g_node graph_node[], double **weight, int nodes);

However, although they look similar, those are very different internally.

If you're using C99, you can use variably-qualified arrays. Quoting an example from the C99 standard (section §6.7.5.2 Array Declarators):

void fvla(int m, int C[m][m]); // valid: VLA with prototype scope

void fvla(int m, int C[m][m])  // valid: adjusted to auto pointer to VLA
{
    typedef int VLA[m][m];     // valid: block scope typedef VLA
    struct tag {
        int (*y)[n];           // invalid: y not ordinary identifier
        int z[n];              // invalid: z not ordinary identifier
    };
    int D[m];                  // valid: auto VLA
    static int E[m];           // invalid: static block scope VLA
    extern int F[m];           // invalid: F has linkage and is VLA
    int (*s)[m];               // valid: auto pointer to VLA
    extern int (*r)[m];        // invalid: r has linkage and points to VLA
    static int (*q)[m] = &B;   // valid: q is a static block pointer to VLA
}

Question in comments

[...] In my main(), the variable I am trying to pass into the function is a double array[][], so how would I pass that into the function? Passing array[0][0] into it gives me incompatible argument type, as does &array and &array[0][0].

In your main(), the variable should be:

double array[10][20];

or something faintly similar; maybe

double array[][20] = { { 1.0, 0.0, ... }, ... };

You should be able to pass that with code like this:

typedef struct graph_node
{
    int X;
    int Y;
    int active;
} g_node;

void print_graph(g_node graph_node[], double weight[][20], int nodes);

int main(void)
{
    g_node g[10];
    double array[10][20];
    int n = 10;

    print_graph(g, array, n);
    return 0;
}

That compiles (to object code) cleanly with GCC 4.2 (i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)) and also with GCC 4.7.0 on Mac OS X 10.7.3 using the command line:

/usr/bin/gcc -O3 -g -std=c99 -Wall -Wextra -c zzz.c

Subtract two variables in Bash

Try this Bash syntax instead of trying to use an external program expr:

count=$((FIRSTV-SECONDV))

BTW, the correct syntax of using expr is:

count=$(expr $FIRSTV - $SECONDV)

But keep in mind using expr is going to be slower than the internal Bash syntax I provided above.

Unable to generate an explicit migration in entity framework

I had the same problems and was only able to resolve it running Add-Migration 'MigrationName' -Force

With -Force being the important part.

Return content with IHttpActionResult for non-OK response

Sorry for the late answer why don't you simple use

return BadRequest("your message");

I use it for all my IHttpActionResult errors its working well

here is the documentation : https://msdn.microsoft.com/en-us/library/system.web.http.apicontroller.badrequest(v=vs.118).aspx

How to check if an Object is a Collection Type in Java?

Since you mentioned reflection in your question;

boolean isArray = myArray.getClass().isArray();
boolean isCollection = Collection.class.isAssignableFrom(myList.getClass());
boolean isMap = Map.class.isAssignableFrom(myMap.getClass());

git switch branch without discarding local changes

You could use --merge/-m git checkout option: git checkout -m <another-branch>

-m --merge

When switching branches, if you have local modifications to one or more files that are different between the current branch and the branch to which you are switching, the command refuses to switch branches in order to preserve your modifications in context. However, with this option, a three-way merge between the current branch, your working tree contents, and the new branch is done, and you will be on the new branch.

Source: https://git-scm.com/docs/git-checkout

python 3.2 UnicodeEncodeError: 'charmap' codec can't encode character '\u2013' in position 9629: character maps to <undefined>

for me , using export PYTHONIOENCODING=UTF-8 before executing python command worked .

How to convert file to base64 in JavaScript?

I have used this simple method and it's worked successfully

 function  uploadImage(e) {
  var file = e.target.files[0];
    let reader = new FileReader();
    reader.onload = (e) => {
    let image = e.target.result;
    console.log(image);
    };
  reader.readAsDataURL(file);
  
}

Can I grep only the first n lines of a file?

grep "pattern" <(head -n 10 filename)

How to customize the configuration file of the official PostgreSQL Docker image?

I looked through all answers and there is another option left. You can change your CMD value in docker file (it is not the best one, but still possible way to achieve your goal).

Basically we need to

  • Copy config file in docker container
  • Override postgres start options

Docker file example:

FROM postgres:9.6
USER postgres

# Copy postgres config file into container
COPY postgresql.conf /etc/postgresql

# Override default postgres config file
CMD ["postgres", "-c", "config_file=/etc/postgresql/postgresql.conf"]

Though I think using command: postgres -c config_file=/etc/postgresql/postgresql.confin your docker-compose.yml file proposed by Matthias Braun is the best option.

How to initialize a nested struct?

Define your Proxy struct separately, outside of Configuration, like this:

type Proxy struct {
    Address string
    Port    string
}

type Configuration struct {
    Val string
    P   Proxy
}

c := &Configuration{
    Val: "test",
    P: Proxy{
        Address: "addr",
        Port:    "80",
    },
}

See http://play.golang.org/p/7PELCVsQIc

How do I install a plugin for vim?

To expand on Karl's reply, Vim looks in a specific set of directories for its runtime files. You can see that set of directories via :set runtimepath?. In order to tell Vim to also look inside ~/.vim/vim-haml you'll want to add

set runtimepath+=$HOME/.vim/vim-haml

to your ~/.vimrc. You'll likely also want the following in your ~/.vimrc to enable all the functionality provided by vim-haml.

filetype plugin indent on
syntax on

You can refer to the 'runtimepath' and :filetype help topics in Vim for more information.

generate days from date range

if you will ever need more then a couple days, you need a table.

Create a date range in mysql

then,

select from days.day, count(mytable.field) as fields from days left join mytable on day=date where date between x and y;

Adding an item to an associative array

I think you want $data[$category] = $question;

Or in case you want an array that maps categories to array of questions:

$data = array();
foreach($file_data as $value) {
    list($category, $question) = explode('|', $value, 2);

    if(!isset($data[$category])) {
        $data[$category] = array();
    }
    $data[$category][] = $question;
}
print_r($data);

Minimum Hardware requirements for Android development

I did the following experiment at home:

let's compare how 2 computers compile the same android application in eclipse. Here are the competitors:

"the monster" - pentinum i7 - 16 gig RAM - solid state hard drive

"peabody" - pentinum i3 - 4 gig RAM

The results: when I compiled the same application in eclipse, the monster and peabody took exactly the same amount of time to bring up the emulator to the point where you have to slide the button to run the app: 1 minute 12 seconds.

After that point, the monster executed the app 30-40 seconds faster than peabody.

The monster costs about $500 more than the peabody. So the question is, is it really worth it? In my opinion, No. I can wait the extra 30-40 seconds

Extract a substring using PowerShell

The -match operator tests a regex, combine it with the magic variable $matches to get your result

PS C:\> $x = "----start----Hello World----end----"
PS C:\> $x -match "----start----(?<content>.*)----end----"
True
PS C:\> $matches['content']
Hello World

Whenever in doubt about regex-y things, check out this site: http://www.regular-expressions.info

What is the difference between partitioning and bucketing a table in Hive ?

There are great responses here. I would like to keep it short to memorize the difference between partition & buckets.

You generally partition on a less unique column. And bucketing on most unique column.

Example if you consider World population with country, person name and their bio-metric id as an example. As you can guess, country field would be the less unique column and bio-metric id would be the most unique column. So ideally you would need to partition the table by country and bucket it by bio-metric id.

Batch file include external file for variables

So you just have to do this right?:

@echo off
echo text shizzle
echo.
echo pause^>nul (press enter)
pause>nul

REM writing to file
(
echo XD
echo LOL
)>settings.cdb
cls

REM setting the variables out of the file
(
set /p input=
set /p input2=
)<settings.cdb
cls

REM echo'ing the variables
echo variables:
echo %input%
echo %input2%
pause>nul

if %input%==XD goto newecho
DEL settings.cdb
exit

:newecho
cls
echo If you can see this, good job!
DEL settings.cdb
pause>nul
exit

Searching if value exists in a list of objects using Linq

List<Customer> list = ...;
Customer john = list.SingleOrDefault(customer => customer.Firstname == "John");

john will be null if no customer exists with a first name of "John".

Getting rid of \n when using .readlines()

This should do what you want (file contents in a list, by line, without \n)

with open(filename) as f:
    mylist = f.read().splitlines() 

How to sort a Pandas DataFrame by index?

Dataframes have a sort_index method which returns a copy by default. Pass inplace=True to operate in place.

import pandas as pd
df = pd.DataFrame([1, 2, 3, 4, 5], index=[100, 29, 234, 1, 150], columns=['A'])
df.sort_index(inplace=True)
print(df.to_string())

Gives me:

     A
1    4
29   2
100  1
150  5
234  3

Enable UTF-8 encoding for JavaScript

I think you just need to make

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">

Before calling your .js files or code

jquery data selector

You can set a data-* attribute on an elm using attr(), and then select using that attribute:

var elm = $('a').attr('data-test',123); //assign 123 using attr()
elm = $("a[data-test=123]"); //select elm using attribute

and now for that elm, both attr() and data() will yield 123:

console.log(elm.attr('data-test')); //123
console.log(elm.data('test')); //123

However, if you modify the value to be 456 using attr(), data() will still be 123:

elm.attr('data-test',456); //modify to 456
elm = $("a[data-test=456]"); //reselect elm using new 456 attribute

console.log(elm.attr('data-test')); //456
console.log(elm.data('test')); //123

So as I understand it, seems like you probably should steer clear of intermingling attr() and data() commands in your code if you don't have to. Because attr() seems to correspond directly with the DOM whereas data() interacts with the 'memory', though its initial value can be from the DOM. But the key point is that the two are not necessarily in sync at all.

So just be careful.

At any rate, if you aren't changing the data-* attribute in the DOM or in the memory, then you won't have a problem. Soon as you start modifying values is when potential problems can arise.

Thanks to @Clarence Liu to @Ash's answer, as well as this post.

Select data from date range between two dates

You should compare dates in sql just like you compare number values,

SELECT * FROM Product_sales
WHERE From_date >= '2013-01-01' AND To_date <= '2013-01-20'

sql use statement with variable

Just wanted to thank KM for his valuable solution. I implemented it myself to reduce the amount of lines in a shrinkdatabase request on SQLServer. Here is my SQL request if it can help anyone :

-- Declare the variable to be used
DECLARE @Query varchar (1000)
DECLARE @MyDBN varchar(11);
-- Initializing the @MyDBN variable (possible values : db1, db2, db3, ...)
SET @MyDBN = 'db1';
-- Creating the request to execute
SET @Query='use '+ @MyDBN +'; ALTER DATABASE '+ @MyDBN +' SET RECOVERY SIMPLE WITH NO_WAIT; DBCC SHRINKDATABASE ('+ @MyDBN +', 1, TRUNCATEONLY); ALTER DATABASE '+ @MyDBN +' SET RECOVERY FULL WITH NO_WAIT'
-- 
EXEC (@Query)

SQL: how to select a single id ("row") that meets multiple criteria from a single column

I was having a similar issue like yours, except that I wanted a specific subset of 'ancestry'. Hong Ning's query was a good start, except it will return combined records containing duplicates and/or extra ancestries (e.g. it would also return someone with ancestries ('England', 'France', 'Germany', 'Netherlands') and ('England', 'France', 'England'). Supposing you'd want just the three and only the three, you'd need the following query:

SELECT Src.user_id
FROM yourtable Src
WHERE ancestry in ('England', 'France', 'Germany')
    AND EXISTS (
        SELECT user_id
        FROM dbo.yourtable
        WHERE user_id = Src.user_id
        GROUP BY user_id
        HAVING COUNT(DISTINCT ancestry) = 3
        )
GROUP BY user_id
HAVING COUNT(DISTINCT ancestry) = 3

How do I write a compareTo method which compares objects?

This is the right way to compare strings:

int studentCompare = this.lastName.compareTo(s.getLastName()); 

This won't even compile:

if (this.getLastName() < s.getLastName())

Use if (this.getLastName().compareTo(s.getLastName()) < 0) instead.

So to compare fist/last name order you need:

int d = getFirstName().compareTo(s.getFirstName());
if (d == 0)
    d = getLastName().compareTo(s.getLastName());
return d;

Converting list to *args when calling function

*args just means that the function takes a number of arguments, generally of the same type.

Check out this section in the Python tutorial for more info.

How to copy data from one table to another new table in MySQL?

This will do what you want:

INSERT INTO table2 (st_id,uid,changed,status,assign_status)
SELECT st_id,from_uid,now(),'Pending','Assigned'
FROM table1

If you want to include all rows from table1. Otherwise you can add a WHERE statement to the end if you want to add only a subset of table1.

I hope this helps.

Should we pass a shared_ptr by reference or by value?

Personally I would use a const reference. There is no need to increment the reference count just to decrement it again for the sake of a function call.

mysql.h file can't be found

You probably don't included the path to mysql headers, which can be found at /usr/include/mysql, on several unix systems I think. See this post, it may be helpfull.

By the way, related with the question of that guy above, about syntastic configuration. One can add the following to your ~/.vimrc:

let b:syntastic_c_cflags = '-I/usr/include/mysql'

and you can always check the wiki page of the developers on github. Enjoy!

How do I install SciPy on 64 bit Windows?

Try to install Python 2.6.3 over your 2.6.2 (this should also add correct Registry entry), or to register your existing installation using this script. Installer should work after that.

Building SciPy requires a Fortran compiler and libraries - BLAS and LAPACK.

Changing Node.js listening port

you can get the nodejs configuration from http://nodejs.org/
The important thing you need to keep in your mind is about its configuration in file app.js which consists of port number host and other settings these are settings working for me

backendSettings = {
"scheme":"https / http ",
"host":"Your website url",
"port":49165, //port number 
'sslKeyPath': 'Path for key',
'sslCertPath': 'path for SSL certificate',
'sslCAPath': '',
"resource":"/socket.io",
"baseAuthPath": '/nodejs/',
"publishUrl":"publish",
"serviceKey":"",
"backend":{
"port":443,
"scheme": 'https / http', //whatever is your website scheme
"host":"host name",
"messagePath":"/nodejs/message/"},
"clientsCanWriteToChannels":false,
"clientsCanWriteToClients":false,
"extensions":"",
"debug":false,
"addUserToChannelUrl": 'user/channel/add/:channel/:uid',
"publishMessageToContentChannelUrl": 'content/token/message',
"transports":["websocket",
"flashsocket",
"htmlfile",
"xhr-polling",
"jsonp-polling"],
"jsMinification":true,
"jsEtag":true,
"logLevel":1};

In this if you are getting "Error: listen EADDRINUSE" then please change the port number i.e, here I am using "49165" so you can use other port such as 49170 or some other port. For this you can refer to the following article
http://www.a2hosting.com/kb/installable-applications/manual-installations/installing-node-js-on-shared-hosting-accounts

TABLOCK vs TABLOCKX

Quite an old article on mssqlcity attempts to explain the types of locks:

Shared locks are used for operations that do not change or update data, such as a SELECT statement.

Update locks are used when SQL Server intends to modify a page, and later promotes the update page lock to an exclusive page lock before actually making the changes.

Exclusive locks are used for the data modification operations, such as UPDATE, INSERT, or DELETE.

What it doesn't discuss are Intent (which basically is a modifier for these lock types). Intent (Shared/Exclusive) locks are locks held at a higher level than the real lock. So, for instance, if your transaction has an X lock on a row, it will also have an IX lock at the table level (which stops other transactions from attempting to obtain an incompatible lock at a higher level on the table (e.g. a schema modification lock) until your transaction completes or rolls back).


The concept of "sharing" a lock is quite straightforward - multiple transactions can have a Shared lock for the same resource, whereas only a single transaction may have an Exclusive lock, and an Exclusive lock precludes any transaction from obtaining or holding a Shared lock.

PHP: How to generate a random, unique, alphanumeric string for use in a secret link?

Security Notice: This solution should not be used in situations where the quality of your randomness can affect the security of an application. In particular, rand() and uniqid() are not cryptographically secure random number generators. See Scott's answer for a secure alternative.

If you do not need it to be absolutely unique over time:

md5(uniqid(rand(), true))

Otherwise (given you have already determined a unique login for your user):

md5(uniqid($your_user_login, true))

XSL xsl:template match="/"

It's worth noting, since it's confusing for people new to XML, that the root (or document node) of an XML document is not the top-level element. It's the parent of the top-level element. This is confusing because it doesn't seem like the top-level element can have a parent. Isn't it the top level?

But look at this, a well-formed XML document:

<?xml-stylesheet href="my_transform.xsl" type="text/xsl"?>
<!-- Comments and processing instructions are XML nodes too, remember. -->
<TopLevelElement/>

The root of this document has three children: a processing instruction, a comment, and an element.

So, for example, if you wanted to write a transform that got rid of that comment, but left in any comments appearing anywhere else in the document, you'd add this to the identity transform:

<xsl:template match="/comment()"/>

Even simpler (and more commonly useful), here's an XPath pattern that matches the document's top-level element irrespective of its name: /*.

How can I clear the terminal in Visual Studio Code?

Try typing in 'cls', if that doesn't work, type 'Clear' capital C. No quotes for any. Hope this helps.

How do I get the SQLSRV extension to work with PHP, since MSSQL is deprecated?

Download Microsoft Drivers for PHP for SQL Server. Extract the files and use one of:

File                             Thread Safe         VC Bulid
php_sqlsrv_53_nts_vc6.dll           No                  VC6
php_sqlsrv_53_nts_vc9.dll           No                  VC9
php_sqlsrv_53_ts_vc6.dll            Yes                 VC6
php_sqlsrv_53_ts_vc9.dll            Yes                 VC9

You can see the Thread Safety status in phpinfo().

Add the correct file to your ext directory and the following line to your php.ini:

extension=php_sqlsrv_53_*_vc*.dll

Use the filename of the file you used.

As Gordon already posted this is the new Extension from Microsoft and uses the sqlsrv_* API instead of mssql_*

Update:
On Linux you do not have the requisite drivers and neither the SQLSERV Extension.
Look at Connect to MS SQL Server from PHP on Linux? for a discussion on this.

In short you need to install FreeTDS and YES you need to use mssql_* functions on linux. see update 2

To simplify things in the long run I would recommend creating a wrapper class with requisite functions which use the appropriate API (sqlsrv_* or mssql_*) based on which extension is loaded.

Update 2: You do not need to use mssql_* functions on linux. You can connect to an ms sql server using PDO + ODBC + FreeTDS. On windows, the best performing method to connect is via PDO + ODBC + SQL Native Client since the PDO + SQLSRV driver can be incredibly slow.

Force add despite the .gitignore file

Despite Daniel Böhmer's working solution, Ohad Schneider offered a better solution in a comment:

If the file is usually ignored, and you force adding it - it can be accidentally ignored again in the future (like when the file is deleted, then a commit is made and the file is re-created.

You should just un-ignore it in the .gitignore file like that: Unignore subdirectories of ignored directories in Git

what's data-reactid attribute in html?

Custom Data attribute in HTML5

Would like to quote Ian's comment in my answer:

It's just an attribute (a valid one) on the element that you can use to store data/info about it.

This code then retrieves it later in the event handler, and uses it to find the target output element. It effectively stores the class of the div where its text should be outputted.

reactid is just a suffix, you can have any name here eg: data-Ayman.

If you want to find the difference check the fiddles in this SO answer and comment.

How to reverse apply a stash?

git checkout -f

will remove any non-commit changes.

C# Linq Group By on multiple columns

Given a list:

var list = new List<Child>()
{
    new Child()
        {School = "School1", FavoriteColor = "blue", Friend = "Bob", Name = "John"},
    new Child()
        {School = "School2", FavoriteColor = "blue", Friend = "Bob", Name = "Pete"},
    new Child()
        {School = "School1", FavoriteColor = "blue", Friend = "Bob", Name = "Fred"},
    new Child()
        {School = "School2", FavoriteColor = "blue", Friend = "Fred", Name = "Bob"},
};

The query would look like:

var newList = list
    .GroupBy(x => new {x.School, x.Friend, x.FavoriteColor})
    .Select(y => new ConsolidatedChild()
        {
            FavoriteColor = y.Key.FavoriteColor,
            Friend = y.Key.Friend,
            School = y.Key.School,
            Children = y.ToList()
        }
    );

Test code:

foreach(var item in newList)
{
    Console.WriteLine("School: {0} FavouriteColor: {1} Friend: {2}", item.School,item.FavoriteColor,item.Friend);
    foreach(var child in item.Children)
    {
        Console.WriteLine("\t Name: {0}", child.Name);
    }
}

Result:

School: School1 FavouriteColor: blue Friend: Bob
    Name: John
    Name: Fred
School: School2 FavouriteColor: blue Friend: Bob
    Name: Pete
School: School2 FavouriteColor: blue Friend: Fred
    Name: Bob

What is the difference between statically typed and dynamically typed languages?

Statically typed languages

A language is statically typed if the type of a variable is known at compile time. For some languages this means that you as the programmer must specify what type each variable is (e.g.: Java, C, C++); other languages offer some form of type inference, the capability of the type system to deduce the type of a variable (e.g.: OCaml, Haskell, Scala, Kotlin)

The main advantage here is that all kinds of checking can be done by the compiler, and therefore a lot of trivial bugs are caught at a very early stage.

Examples: C, C++, Java, Rust, Go, Scala

Dynamically typed languages

A language is dynamically typed if the type is associated with run-time values, and not named variables/fields/etc. This means that you as a programmer can write a little quicker because you do not have to specify types every time (unless using a statically-typed language with type inference).

Examples: Perl, Ruby, Python, PHP, JavaScript

Most scripting languages have this feature as there is no compiler to do static type-checking anyway, but you may find yourself searching for a bug that is due to the interpreter misinterpreting the type of a variable. Luckily, scripts tend to be small so bugs have not so many places to hide.

Most dynamically typed languages do allow you to provide type information, but do not require it. One language that is currently being developed, Rascal, takes a hybrid approach allowing dynamic typing within functions but enforcing static typing for the function signature.

What is the best way to check for Internet connectivity using .NET?

I personally find the answer of Anton and moffeltje best, but I added a check to exclude virtual networks set up by VMWare and others.

public static bool IsAvailableNetworkActive()
{
    // only recognizes changes related to Internet adapters
    if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()) return false;

    // however, this will include all adapters -- filter by opstatus and activity
    NetworkInterface[] interfaces = System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces();
    return (from face in interfaces
            where face.OperationalStatus == OperationalStatus.Up
            where (face.NetworkInterfaceType != NetworkInterfaceType.Tunnel) && (face.NetworkInterfaceType != NetworkInterfaceType.Loopback)
            where (!(face.Name.ToLower().Contains("virtual") || face.Description.ToLower().Contains("virtual")))
            select face.GetIPv4Statistics()).Any(statistics => (statistics.BytesReceived > 0) && (statistics.BytesSent > 0));
}

How to select ALL children (in any level) from a parent in jQuery?

I think you could do:

$('#google_translate_element').find('*').each(function(){
    $(this).unbind('click');
});

but it would cause a lot of overhead

Java AES and using my own Key

    byte[] seed = (SALT2 + username + password).getBytes();
    SecureRandom random = new SecureRandom(seed);
    KeyGenerator generator;
    generator = KeyGenerator.getInstance("AES");
    generator.init(random);
    generator.init(256);
    Key keyObj = generator.generateKey();

Change input text border color without changing its height

Set a transparent border and then change it:

.default{
border: 2px solid transparent;
}

.new{
border: 2px solid red;
}

Export HTML table to pdf using jspdf

You can also use the jsPDF-AutoTable plugin. You can check out a demo here that uses the following code.

var doc = new jsPDF('p', 'pt');
var elem = document.getElementById("basic-table");
var res = doc.autoTableHtmlToJson(elem);
doc.autoTable(res.columns, res.data);
doc.save("table.pdf");

'git status' shows changed files, but 'git diff' doesn't

Short Answer

Running git add sometimes helps.

Example

Git status is showing changed files and git diff is showing nothing...

> git status
On branch master
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

        modified:   package.json

no changes added to commit (use "git add" and/or "git commit -a")
> git diff
> 

...running git add resolves the inconsistency.

> git add
> git status
On branch master
nothing to commit, working directory clean
> 

How do I use a compound drawable instead of a LinearLayout that contains an ImageView and a TextView

You can use general compound drawable implementation, but if you need to define a size of drawable use this library:

https://github.com/a-tolstykh/textview-rich-drawable

Here is a small example of usage:

<com.tolstykh.textviewrichdrawable.TextViewRichDrawable
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Some text"
        app:compoundDrawableHeight="24dp"
        app:compoundDrawableWidth="24dp" />

Returning an empty array

I'm pretty sure you should go with bar(); because with foo(); it creates a List (for nothing) since you create a new File[0] in the end anyway, so why not go with directly returning it!

How to load property file from classpath?

If you use the static method and load the properties file from the classpath folder so you can use the below code :

//load a properties file from class path, inside static method
Properties prop = new Properties();
prop.load(Classname.class.getClassLoader().getResourceAsStream("foo.properties"));

javascript: optional first argument in function

There is a nice read on Default parameters in ES6 on the MDN website here.
In ES6 you can now do the following:

secondDefaultValue = 'indirectSecondDefaultValue';

function MyObject( param1 = 'firstDefaultValue', param2 = secondDefaultValue ){
    this.first = param1;
    this.second = param2;
}

You can use this also as follows:

var object = new MyObject( undefined, options );

Which will set default value 'firstDefaultValue' for first param1 and your options for second param2.

Here a demonstration in a fiddle

How to access JSON decoded array in PHP

$data = json_decode($json, true);
echo $data[0]["c_name"]; // "John"


$data = json_decode($json);
echo $data[0]->c_name;      // "John"

How can I make a UITextField move up when the keyboard is present - on starting to edit?

Been searching for a good tutorial for beginners on the subject, found the best tutorial here.

In the MIScrollView.h example at the bottom of the tutorial be sure to put a space at

@property (nonatomic, retain) id backgroundTapDelegate;

as you see.

How to make overlay control above all other controls?

This is a common function of Adorners in WPF. Adorners typically appear above all other controls, but the other answers that mention z-order may fit your case better.

Min width in window resizing

Well, you pretty much gave yourself the answer. In your CSS give the containing element a min-width. If you have to support IE6 you can use the min-width-trick:

#container {
    min-width:800px;
    width: auto !important;
    width:800px;
}

That will effectively give you 800px min-width in IE6 and any up-to-date browsers.

Check if value already exists within list of dictionaries?

Perhaps a function along these lines is what you're after:

 def add_unique_to_dict_list(dict_list, key, value):
  for d in dict_list:
     if key in d:
        return d[key]

  dict_list.append({ key: value })
  return value

How can I send large messages with Kafka (over 15MB)?

You need to adjust three (or four) properties:

  • Consumer side:fetch.message.max.bytes - this will determine the largest size of a message that can be fetched by the consumer.
  • Broker side: replica.fetch.max.bytes - this will allow for the replicas in the brokers to send messages within the cluster and make sure the messages are replicated correctly. If this is too small, then the message will never be replicated, and therefore, the consumer will never see the message because the message will never be committed (fully replicated).
  • Broker side: message.max.bytes - this is the largest size of the message that can be received by the broker from a producer.
  • Broker side (per topic): max.message.bytes - this is the largest size of the message the broker will allow to be appended to the topic. This size is validated pre-compression. (Defaults to broker's message.max.bytes.)

I found out the hard way about number 2 - you don't get ANY exceptions, messages, or warnings from Kafka, so be sure to consider this when you are sending large messages.

Select SQL Server database size

Also compare the results with the following query's result

EXEC sp_helpdb @dbname= 'MSDB'

It produces result similar to the following

enter image description here

There is a good article - Different ways to determine free space for SQL Server databases and database files

Find if variable is divisible by 2

You can also:

if (x & 1)
 itsOdd();
else
 itsEven();

Lua string to int

tonumber (e [, base])

tonumber takes two arguments, first is string which is converted to number and second is base of e.

Return value tonumber is in base 10.

If no base is provided it converts number to base 10.

> a = '101'
> tonumber(a)
101

If base is provided, it converts it to the given base.

> a = '101'
> 
> tonumber(a, 2)
5
> tonumber(a, 8)
65
> tonumber(a, 10)
101
> tonumber(a, 16)
257
> 

If e contains invalid character then it returns nil.

> --[[ Failed because base 2 numbers consist (0 and 1) --]]
> a = '112'
> tonumber(a, 2)
nil
> 
> --[[ similar to above one, this failed because --]]
> --[[ base 8 consist (0 - 7) --]]
> --[[ base 10 consist (0 - 9) --]]
> a = 'AB'
> tonumber(a, 8)
nil
> tonumber(a, 10)
nil
> tonumber(a, 16)
171

I answered considering Lua5.3

MySQL, update multiple tables with one query

That's usually what stored procedures are for: to implement several SQL statements in a sequence. Using rollbacks, you can ensure that they are treated as one unit of work, ie either they are all executed or none of them are, to keep data consistent.

OwinStartup not firing

After converting a class library to a Web Application Project, I ran into this and became stubborn. Turned out, in my .csProj file, I had this:

<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
  <DebugSymbols>true</DebugSymbols>
  <DebugType>full</DebugType>
  <Optimize>false</Optimize>
  <OutputPath>bin\Debug\</OutputPath>
  <DefineConstants>DEBUG;TRACE</DefineConstants>
  <ErrorReport>prompt</ErrorReport>
  <WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
  <DebugType>pdbonly</DebugType>
  <Optimize>true</Optimize>
  <OutputPath>bin\Release\</OutputPath>
  <DefineConstants>TRACE</DefineConstants>
  <ErrorReport>prompt</ErrorReport>
  <WarningLevel>4</WarningLevel>
</PropertyGroup>
  • thus building the various dll's into a subfolder of the bin-folder (which ifc. won't work). Solution was to change both text-contents for OutputPath to just bin\.

How to do joins in LINQ on multiple fields in single join

I think a more readable and flexible option is to use Where function:

var result = from x in entity1
             from y in entity2
                 .Where(y => y.field1 == x.field1 && y.field2 == x.field2)

This also allows to easily change from inner join to left join by appending .DefaultIfEmpty().

SQL Server 2012 column identity increment jumping from 6 to 1000+ on 7th entry

This is all perfectly normal. Microsoft added sequences in SQL Server 2012, finally, i might add and changed the way identity keys are generated. Have a look here for some explanation.

If you want to have the old behaviour, you can:

  1. use trace flag 272 - this will cause a log record to be generated for each generated identity value. The performance of identity generation may be impacted by turning on this trace flag.
  2. use a sequence generator with the NO CACHE setting (http://msdn.microsoft.com/en-us/library/ff878091.aspx)

Query to count the number of tables I have in MySQL

In case you would like a count all the databases plus a summary, please try this:

SELECT IFNULL(table_schema,'Total') "Database",TableCount 
FROM (SELECT COUNT(1) TableCount,table_schema 
      FROM information_schema.tables 
      WHERE table_schema NOT IN ('information_schema','mysql') 
      GROUP BY table_schema WITH ROLLUP) A;

Here is a sample run:

mysql> SELECT IFNULL(table_schema,'Total') "Database",TableCount
    -> FROM (SELECT COUNT(1) TableCount,table_schema
    ->       FROM information_schema.tables
    ->       WHERE table_schema NOT IN ('information_schema','mysql')
    ->       GROUP BY table_schema WITH ROLLUP) A;
+--------------------+------------+
| Database           | TableCount |
+--------------------+------------+
| performance_schema |         17 |
| Total              |         17 |
+--------------------+------------+
2 rows in set (0.29 sec)

Give it a Try !!!

Redirecting a request using servlets and the "setHeader" method not working

As you can see, the response is still HTTP/1.1 200 OK. To indicate a redirect, you need to send back a 302 status code:

response.setStatus(HttpServletResponse.SC_FOUND); // SC_FOUND = 302

jQuery won't parse my JSON from AJAX query

If returning an array works and returning a single object doesn't, you might also try returning your single object as an array containing that single object:

[ { title: "One", key: "1" } ]

that way you are returning a consistent data structure, an array of objects, no matter the data payload.

i see that you've tried wrapping your single object in "parenthesis", and suggest this with example because of course JavaScript treats [ .. ] differently than ( .. )

Get user's current location

MaxMind GeoIP is a good service. They also have a free city-level lookup service.

How do I force Robocopy to overwrite files?

This is really weird, why nobody is mentioning the /IM switch ?! I've been using it for a long time in backup jobs. But I tried googling just now and I couldn't land on a single web page that says anything about it even on MS website !!! Also found so many user posts complaining about the same issue!!

Anyway.. to use Robocopy to overwrite EVERYTHING what ever size or time in source or distination you must include these three switches in your command (/IS /IT /IM)

/IS :: Include Same files. (Includes same size files)
/IT :: Include Tweaked files. (Includes same files with different Attributes)
/IM :: Include Modified files (Includes same files with different times).

This is the exact command I use to transfer few TeraBytes of mostly 1GB+ files (ISOs - Disk Images - 4K Videos):

robocopy B:\Source D:\Destination /E /J /COPYALL /MT:1 /DCOPY:DATE /IS /IT /IM /X /V /NP /LOG:A:\ROBOCOPY.LOG

I did a small test for you .. and here is the result:

               Total    Copied   Skipped  Mismatch    FAILED    Extras
    Dirs :      1028      1028         0         0         0       169
   Files :      8053      8053         0         0         0         1
   Bytes : 649.666 g 649.666 g         0         0         0   1.707 g
   Times :   2:46:53   0:41:43                       0:00:00   0:41:44


   Speed :           278653398 Bytes/sec.
   Speed :           15944.675 MegaBytes/min.
   Ended : Friday, August 21, 2020 7:34:33 AM

Dest, Disk: WD Gold 6TB (Compare the write speed with my result)

Even with those "Extras", that's for reporting only because of the "/X" switch. As you can see nothing was Skipped and Total number and size of all files are equal to the Copied. Sometimes It will show small number of skipped files when I abuse it and cancel it multiple times during operation but even with that the values in the first 2 columns are always Equal. I also confirmed that once before by running a PowerShell script that scans all files in destination and generate a report of all time-stamps.

Some performance tips from my history with it and so many tests & troubles!:

. Despite of what most users online advise to use maximum threads "/MT:128" like it's a general trick to get the best performance ... PLEASE DON'T USE "/MT:128" WITH VERY LARGE FILES ... that's a big mistake and it will decrease your drive performance dramatically after several runs .. it will create very high fragmentation or even cause the files system to fail in some cases and you end up spending valuable time trying to recover a RAW partition and all that nonsense. And above all that, It will perform 4-6 times slower!!

For very large files:

  1. Use Only "One" thread "/MT:1" | Impact: BIG
  2. Must use "/J" to disable buffering. | Impact: High
  3. Use "/NP" with "/LOG:file" and Don't output to the console by "/TEE" | Impact: Medium.
  4. Put the "/LOG:file" on a separate drive from the source or destination | Impact: Low.

For regular big files:

  1. Use multi threads, I would not exceed "/MT:4" | Impact: BIG
  2. IF destination disk has low Cache specs use "/J" to disable buffering | Impact: High
  3. & 4 same as above.

For thousands of tiny files:

  1. Go nuts :) with Multi threads, at first I would start with 16 and multibly by 2 while monitoring the disk performance. Once it starts dropping I'll fall back to the prevouse value and stik with it | Impact: BIG
  2. Don't use "/J" | Impact: High
  3. Use "/NP" with "/LOG:file" and Don't output to the console by "/TEE" | Impact: HIGH.
  4. Put the "/LOG:file" on a separate drive from the source or destination | Impact: HIGH.

PHP: How to remove specific element from an array?

A better approach would maybe be to keep your values as keys in an associative array, and then call array_keys() on it when you want to actual array. That way you don't need to use array_search to find your element.

Android SQLite: Update Statement

It's all in the tutorial how to do that:

    ContentValues args = new ContentValues();
    args.put(columnName, newValue);
    db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null);

Use ContentValues to set the updated columns and than the update() method in which you have to specifiy, the table and a criteria to only update the rows you want to update.

What does 'x packages are looking for funding' mean when running `npm install`?

When you run npm update in the command prompt, when it is done it will recommend you type a new command called npm fund.

When you run npm fund it will list all the modules and packages you have installed that were created by companies or organizations that need money for their IT projects. You will see a list of webpages where you can send them money. So "funds" means "Angular packages you installed that could use some money from you as an option to help support their businesses".

It's basically a list of the modules you have that need contributions or donations of money to their projects and which list websites where you can enter a credit card to help pay for them.

stdlib and colored output in C

Dealing with colour sequences can get messy and different systems might use different Colour Sequence Indicators.

I would suggest you try using ncurses. Other than colour, ncurses can do many other neat things with console UI.

Storage permission error in Marshmallow

   Try this



int permission = ContextCompat.checkSelfPermission(MainActivity.this,
                    android.Manifest.permission.WRITE_EXTERNAL_STORAGE);

     if (permission != PackageManager.PERMISSION_GRANTED) {
                Log.i("grant", "Permission to record denied");

                if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                        android.Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(this);
                    builder.setMessage(getString(R.string.permsg))
                            .setTitle(getString(R.string.permtitle));

                    builder.setPositiveButton(getString(R.string.ok), new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog, int id) {
                            Log.i("grant", "Clicked");
                            makeRequest();
                        }
                    });

                    AlertDialog dialog = builder.create();
                    dialog.show();

                } else {

                    //makeRequest1();
                    makeRequest();
                }
            }


     protected void makeRequest() {
            ActivityCompat.requestPermissions(this,
                    new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    500);
        }



     @Override
        public void onRequestPermissionsResult(int requestCode,
                                               String permissions[], int[] grantResults) {
            switch (requestCode) {
                case 500: {

                    if (grantResults.length == 0
                            || grantResults[0] !=
                            PackageManager.PERMISSION_GRANTED) {

                        Log.i("1", "Permission has been denied by user");

                    } else {

                        Log.i("1", "Permission has been granted by user");

                    }
                    return;
                }

            }
        }

What's the difference between map() and flatMap() methods in Java 8?

Stream.flatMap, as it can be guessed by its name, is the combination of a map and a flat operation. That means that you first apply a function to your elements, and then flatten it. Stream.map only applies a function to the stream without flattening the stream.

To understand what flattening a stream consists in, consider a structure like [ [1,2,3],[4,5,6],[7,8,9] ] which has "two levels". Flattening this means transforming it in a "one level" structure : [ 1,2,3,4,5,6,7,8,9 ].

How do I edit $PATH (.bash_profile) on OSX?

In Macbook, step by step:

  1. First of all open terminal and write it: cd ~/
  2. Create your bash file: touch .bash_profile

You created your ".bash_profile" file but if you would like to edit it, you should write it;

  1. Edit your bash profile: open -e .bash_profile

After you can save from top-left corner of screen: File > Save

@canerkaseler

Executing <script> injected by innerHTML after AJAX call

If you are injecting something that needs the script tag, you may get an uncaught syntax error and say illegal token. To avoid this, be sure to escape the forward slashes in your closing script tag(s). ie;

var output += '<\/script>';

Same goes for any closing tags, such as a form tag.

Where does Oracle SQL Developer store connections?

It was in a slightly different location for me than those listed above

\Users\[user]\AppData\Roaming\SQL Developer\system3.2.20.09.87\o.jdeveloper.db.connection.11.1.1.4.37.59.48\connections.xml

Access HTTP response as string in Go

The method you're using to read the http body response returns a byte slice:

func ReadAll(r io.Reader) ([]byte, error)

official documentation

You can convert []byte to a string by using

body, err := ioutil.ReadAll(resp.Body)
bodyString := string(body)

Command not found when using sudo

The other solutions I've seen here so far are based on some system definitions, but it's in fact possible to have sudo use the current PATH (with the env command) and/or the rest of the environment (with the -E option) just by invoking it right:

sudo -E env "PATH=$PATH" <command> [arguments]

In fact, one can make an alias out of it:

alias mysudo='sudo -E env "PATH=$PATH"'

(It's also possible to name the alias itself sudo, replacing the original sudo.)

Dynamically allocating an array of objects

Using the placement feature of new operator, you can create the object in place and avoid copying:

placement (3) :void* operator new (std::size_t size, void* ptr) noexcept;

Simply returns ptr (no storage is allocated). Notice though that, if the function is called by a new-expression, the proper initialization will be performed (for class objects, this includes calling its default constructor).

I suggest the following:

A* arrayOfAs = new A[5]; //Allocate a block of memory for 5 objects
for (int i = 0; i < 5; ++i)
{
    //Do not allocate memory,
    //initialize an object in memory address provided by the pointer
    new (&arrayOfAs[i]) A(3);
}