#Deployment descriptor | Programs & Examples on Deployment descriptor

How to pass form input value to php function

You need to look into Ajax; Start here this is the best way to stay on the current page and be able to send inputs to php.

<!DOCTYPE html>
<html>
<head>
<script>
function showHint(str)
{
var xmlhttp;
if (str.length==0)
  { 
  document.getElementById("txtHint").innerHTML="";
  return;
  }
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET","gethint.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>

<h3>Start typing a name in the input field below:</h3>
<form action=""> 
First name: <input type="text" id="txt1" onkeyup="showHint(this.value)" />
</form>
<p>Suggestions: <span id="txtHint"></span></p> 

</body>
</html>

This gets the users input on the textbox and opens the webpage gethint.php?q=ja from here the php script can do anything with $_GET['q'] and echo back to the page James, Jason....etc

Iterate over model instance field names and values in template

_x000D_

<table border='1'>_x000D_
 <tr>_x000D_
  {% for mfild in fields%}_x000D_
   <td>{{mfild}}</td>_x000D_
  {% endfor%}_x000D_
 </tr>_x000D_
    {%for v in records%}_x000D_
        <tr>_x000D_
         <td>{{v.id}}</td>_x000D_
         <td>{{v.title}}</td>_x000D_
         <td class="">{{v.desc}}</td>_x000D_
_x000D_
        </tr>_x000D_
_x000D_
    {% endfor%}_x000D_
 </table>_x000D_
 _x000D_
 _x000D_
enter code here

_x000D_

How to align texts inside of an input?

Try this in your CSS:

input {
text-align: right;
}

To align the text in the center:

input {
text-align: center;
}

But, it should be left-aligned, as that is the default - and appears to be the most user friendly.

How can I strip all punctuation from a string in JavaScript using regex?

if you are using lodash

_.words('This, is : my - test,line:').join(' ')

This Example

_.words('"This., -/ is #! an $ % ^ & * example ;: {} of a = -_ string with `~)() punctuation"').join(' ')

SELECT INTO using Oracle

Use:

create table new_table_name 
as
select column_name,[more columns] from Existed_table;

Example:

create table dept
as
select empno, ename from emp;

If the table already exists:

insert into new_tablename select columns_list from Existed_table;

Convert a Unix timestamp to time in JavaScript

_x000D_

function timeConverter(UNIX_timestamp){_x000D_
  var a = new Date(UNIX_timestamp * 1000);_x000D_
  var months = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];_x000D_
  var year = a.getFullYear();_x000D_
  var month = months[a.getMonth()];_x000D_
  var date = a.getDate();_x000D_
  var hour = a.getHours();_x000D_
  var min = a.getMinutes();_x000D_
  var sec = a.getSeconds();_x000D_
  var time = date + ' ' + month + ' ' + year + ' ' + hour + ':' + min + ':' + sec ;_x000D_
  return time;_x000D_
}_x000D_
console.log(timeConverter(0));

_x000D_

Using mysql concat() in WHERE clause?

Note that the search query is now case sensitive.

When using

SELECT * FROM table WHERE `first_name` LIKE '%$search_term%'

It will match both "Larry" and "larry". With this concat_ws, it will suddenly become case sensitive!

This can be fixed by using the following query:

SELECT * FROM table WHERE UPPER(CONCAT_WS(' ', `first_name`, `last_name`) LIKE UPPER('%$search_term%')

Edit: Note that this only works on non-binary elements. See also mynameispaulie's answer.

How do I parse JSON with Ruby on Rails?

These answers are a bit dated. Therefore I give you:

hash = JSON.parse string

Rails should automagically load the json module for you, so you don't need to add require 'json'.

What is the best way to auto-generate INSERT statements for a SQL Server table?

I made a simple to use utility, hope you enjoy.

It doesn't need to create any objects on the database (easy to use on production environment).
You don't need to install anything. It's just a regular script.
You don't need special permissions. Just regular read access is enough.
Let you copy all the lines of a table, or specify WHERE conditions so only the lines you want will be generated.
Let you specify a single or multiple tables and different condition statements to be generated.

If the generated INSERT statements are being truncated, check the limit text length of the results on the Management Studio Options: Tools > Options, Query Results > SQL Server > Results to Grid, "Non XML data" value under "Maximum Characters Retrieved".

    -- Make sure you're on the correct database
    SET NOCOUNT ON;
    BEGIN TRY
    BEGIN TRANSACTION

    DECLARE @Tables TABLE (
        TableName          varchar(50) NOT NULL,
        Arguments           varchar(1000) NULL
    );

    -- INSERT HERE THE TABLES AND CONDITIONS YOU WANT TO GENERATE THE INSERT STATEMENTS
    INSERT INTO @Tables (TableName, Arguments) VALUES ('table1', 'WHERE field1 = 3101928464');
    -- (ADD MORE LINES IF YOU LIKE) INSERT INTO @Tables (TableName, Arguments) VALUES ('table2', 'WHERE field2 IN (1, 3, 5)');



    -- YOU DON'T NEED TO EDIT FROM NOW ON.
    -- Generating the Script
    DECLARE @TableName  varchar(50),
            @Arguments  varchar(1000),
            @ColumnName varchar(50),
            @strSQL     varchar(max),
            @strSQL2    varchar(max),
            @Lap        int,
            @Iden       int,
            @TypeOfData int;

    DECLARE C1 CURSOR FOR
    SELECT TableName, Arguments FROM @Tables
    OPEN C1
    FETCH NEXT FROM C1 INTO @TableName, @Arguments;
    WHILE @@FETCH_STATUS = 0
    BEGIN

        -- If you want to delete the lines before inserting, uncomment the next line
        -- PRINT 'DELETE FROM ' + @TableName + ' ' + @Arguments

        SET @strSQL = 'INSERT INTO ' + @TableName + ' (';

        -- List all the columns from the table (to the INSERT into columns...)
        SET @Lap = 0;
        DECLARE C2 CURSOR FOR
        SELECT sc.name, sc.type FROM syscolumns sc INNER JOIN sysobjects so ON so.id = sc.id AND so.name = @TableName AND so.type = 'U' WHERE sc.colstat = 0 ORDER BY sc.colorder
        OPEN C2
        FETCH NEXT FROM C2 INTO @ColumnName, @TypeOfData;
        WHILE @@FETCH_STATUS = 0
        BEGIN
            IF(@Lap>0)
            BEGIN
                SET @strSQL = @strSQL + ', ';
            END

            SET @strSQL = @strSQL + @ColumnName;
            SET @Lap = @Lap + 1;
            FETCH NEXT FROM C2 INTO @ColumnName, @TypeOfData;
        END
        CLOSE C2
        DEALLOCATE C2

        SET @strSQL = @strSQL + ')'
        SET @strSQL2 = 'SELECT ''' + @strSQL + '
SELECT '' + ';

        -- List all the columns from the table again (for the SELECT that will be the input to the INSERT INTO statement)
        SET @Lap = 0;
        DECLARE C2 CURSOR FOR
        SELECT sc.name, sc.type FROM syscolumns sc INNER JOIN sysobjects so ON so.id = sc.id AND so.name = @TableName AND so.type = 'U' WHERE sc.colstat = 0 ORDER BY sc.colorder
        OPEN C2
        FETCH NEXT FROM C2 INTO @ColumnName, @TypeOfData;
        WHILE @@FETCH_STATUS = 0
        BEGIN
            IF(@Lap>0)
            BEGIN
                SET @strSQL2 = @strSQL2 + ' + '', '' + ';
            END

            -- For each data type, convert the data properly
            IF(@TypeOfData IN (55, 106, 56, 108, 63, 38, 109, 50, 48, 52)) -- Numbers
                SET @strSQL2 = @strSQL2 + 'ISNULL(CONVERT(varchar(max), ' + @ColumnName + '), ''NULL'') + '' as ' + @ColumnName + '''';
            ELSE IF(@TypeOfData IN (62)) -- Float Numbers
                SET @strSQL2 = @strSQL2 + 'ISNULL(CONVERT(varchar(max), CONVERT(decimal(18,5), ' + @ColumnName + ')), ''NULL'') + '' as ' + @ColumnName + '''';
            ELSE IF(@TypeOfData IN (61, 111)) -- Datetime
                SET @strSQL2 = @strSQL2 + 'ISNULL( '''''''' + CONVERT(varchar(max),' + @ColumnName + ', 121) + '''''''', ''NULL'') + '' as ' + @ColumnName + '''';
            ELSE IF(@TypeOfData IN (47, 39)) -- Texts
                SET @strSQL2 = @strSQL2 + 'ISNULL('''''''' + RTRIM(LTRIM(' + @ColumnName + ')) + '''''''', ''NULL'') + '' as ' + @ColumnName + '''';
            ELSE -- Unknown data types
                SET @strSQL2 = @strSQL2 + 'ISNULL(CONVERT(varchar(max), ' + @ColumnName + '), ''NULL'') + '' as ' + @ColumnName + '(INCORRECT TYPE ' + CONVERT(varchar(10), @TypeOfData) + ')''';

            SET @Lap = @Lap + 1;
            FETCH NEXT FROM C2 INTO @ColumnName, @TypeOfData;
        END
        CLOSE C2
        DEALLOCATE C2

        SET @strSQL2 = @strSQL2 + ' as [-- ' + @TableName + ']
FROM ' + @TableName + ' WITH (NOLOCK) ' + @Arguments

        SET @strSQL2 = @strSQL2 + ';
';
        --PRINT @strSQL;
        --PRINT @strSQL2;
        EXEC(@strSQL2);

        FETCH NEXT FROM C1 INTO @TableName, @Arguments;
    END
    CLOSE C1
    DEALLOCATE C1

    ROLLBACK
END TRY
BEGIN CATCH
    ROLLBACK TRAN
    SELECT 0 AS Situacao;
    SELECT
        ERROR_NUMBER() AS ErrorNumber
        ,ERROR_SEVERITY() AS ErrorSeverity
        ,ERROR_STATE() AS ErrorState
        ,ERROR_PROCEDURE() AS ErrorProcedure
        ,ERROR_LINE() AS ErrorLine
        ,ERROR_MESSAGE() AS ErrorMessage,
        @strSQL As strSQL,
        @strSQL2 as strSQL2;
END CATCH

JSON order mixed up

For those who're using maven, please try com.github.tsohr/json

<!-- https://mvnrepository.com/artifact/com.github.tsohr/json -->
<dependency>
    <groupId>com.github.tsohr</groupId>
    <artifactId>json</artifactId>
    <version>0.0.1</version>
</dependency>

It's forked from JSON-java but switch its map implementation with LinkedHashMap which @lemiorhan noted above.

How to connect to a secure website using SSL in Java with a pkcs12 file?

I realise that this article may be outdated but still I would like to ask smithsv to correct his source code, it contains many mistakes, I managed to correct most of them but still don't know what kind of object x509 could be.Here is the source code as I think is should be:

import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.util.Enumeration;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;

public class Connection2 {
    public void connect() {
        /*
         * This is an example to use ONLY p12 file it's not optimazed but it
         * work. The pkcs12 file where generated by OpenSSL by me. Example how
         * to load p12 file and build Trust zone from it... It outputs
         * certificates from p12 file and add good certs to TrustStore
         */
        KeyStore ks = KeyStore.getInstance( "pkcs12" );
        ks.load( new FileInputStream( cert.pfx ), "passwrd".toCharArray() );

        KeyStore jks = KeyStore.getInstance( "JKS" );
        jks.load( null );

        for( Enumeration t = ks.aliases(); t.hasMoreElements(); ) {
            String alias = (String )t.nextElement();
            System.out.println( "@:" + alias );
            if( ks.isKeyEntry( alias ) ) {
                Certificate[] a = ks.getCertificateChain( alias );
                for( int i = 0; i == 0; )
                    jks.setCertificateEntry( x509Cert.getSubjectDN().toString(), x509 );

                System.out.println( ks.getCertificateAlias( x509 ) );
                System.out.println( "ok" );
            }
        }

        System.out.println( "init Stores..." );

        KeyManagerFactory kmf = KeyManagerFactory.getInstance( "SunX509" );
        kmf.init( ks, "c1".toCharArray() );

        TrustManagerFactory tmf = TrustManagerFactory.getInstance( "SunX509" );
        tmf.init( jks );

        SSLContext ctx = SSLContext.getInstance( "TLS" );
        ctx.init( kmf.getKeyManagers(), tmf.getTrustManagers(), null );
    }
}

indexOf method in an object array?

In ES2015, this is pretty easy:

myArray.map(x => x.hello).indexOf('stevie')

or, probably with better performance for larger arrays:

myArray.findIndex(x => x.hello === 'stevie')

Call a "local" function within module.exports from another function in module.exports?

You could declare your functions outside of the module.exports block.

var foo = function (req, res, next) {
  return ('foo');
}

var bar = function (req, res, next) {
  return foo();
}

Then:

module.exports = {
  foo: foo,
  bar: bar
}

jQuery Selector: Id Ends With?

It's safer to add the underscore or $ to the term you're searching for so it's less likely to match other elements which end in the same ID:

$("element[id$=_txtTitle]")

(where element is the type of element you're trying to find - eg div, input etc.

(Note, you're suggesting your IDs tend to have $ signs in them, but I think .NET 2 now tends to use underscores in the ID instead, so my example uses an underscore).

Docker-Compose persistent data MySQL

The data container is a superfluous workaround. Data-volumes would do the trick for you. Alter your docker-compose.yml to:

version: '2'
services:
  mysql:
    container_name: flask_mysql
    restart: always
    image: mysql:latest
    environment:
      MYSQL_ROOT_PASSWORD: 'test_pass' # TODO: Change this
      MYSQL_USER: 'test'
      MYSQL_PASS: 'pass'
    volumes:
      - my-datavolume:/var/lib/mysql
volumes:
  my-datavolume:

Docker will create the volume for you in the /var/lib/docker/volumes folder. This volume persist as long as you are not typing docker-compose down -v

How do you input command line arguments in IntelliJ IDEA?

maytham-???i???, you can use this code to simulate input of file:

System.setIn(new FileInputStream("FILE_NAME"));

Or send file name as parameter and then put it into FileInputStream:

System.setIn(new FileInputStream(args[0]));

Getting a POST variable

Use the

Request.Form[]

for POST variables,

Request.QueryString[]

for GET.

How do I get the AM/PM value from a DateTime?

How about:

dateTime.ToString("tt", CultureInfo.InvariantCulture);

How to provide animation when calling another activity in Android?

Jelly Bean adds support for this with the ActivityOptions.makeCustomAnimation() method. Of course, since it's only on Jelly Bean, it's pretty much worthless for practical purposes.

How to percent-encode URL parameters in Python?

In Python 3, urllib.quote has been moved to urllib.parse.quote and it does handle unicode by default.

>>> from urllib.parse import quote
>>> quote('/test')
'/test'
>>> quote('/test', safe='')
'%2Ftest'
>>> quote('/El Niño/')
'/El%20Ni%C3%B1o/'

How do I commit only some files?

Get a list of files you want to commit

$ git status

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:   file1
modified:   file2
modified:   file3
modified:   file4

Add the files to staging

$ git add file1 file2

Check to see what you are committing

$ git status

Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

    modified:   file1
    modified:   file2

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:   file3
    modified:   file4

Commit the files with a commit message

$ git commit -m "Fixed files 1 and 2"

If you accidentally commit the wrong files

$ git reset --soft HEAD~1

If you want to unstage the files and start over

$ git reset

Unstaged changes after reset:
M file1
M file2
M file3
M file4

What are the time complexities of various data structures?

Arrays

Set, Check element at a particular index: O(1)
Searching: O(n) if array is unsorted and O(log n) if array is sorted and something like a binary search is used,
As pointed out by Aivean, there is no Delete operation available on Arrays. We can symbolically delete an element by setting it to some specific value, e.g. -1, 0, etc. depending on our requirements
Similarly, Insert for arrays is basically Set as mentioned in the beginning

ArrayList:

Add: Amortized O(1)
Remove: O(n)
Contains: O(n)
Size: O(1)

Linked List:

Inserting: O(1), if done at the head, O(n) if anywhere else since we have to reach that position by traveseing the linkedlist linearly.
Deleting: O(1), if done at the head, O(n) if anywhere else since we have to reach that position by traveseing the linkedlist linearly.
Searching: O(n)

Doubly-Linked List:

Inserting: O(1), if done at the head or tail, O(n) if anywhere else since we have to reach that position by traveseing the linkedlist linearly.
Deleting: O(1), if done at the head or tail, O(n) if anywhere else since we have to reach that position by traveseing the linkedlist linearly.
Searching: O(n)

Stack:

Push: O(1)
Pop: O(1)
Top: O(1)
Search (Something like lookup, as a special operation): O(n) (I guess so)

Queue/Deque/Circular Queue:

Insert: O(1)
Remove: O(1)
Size: O(1)

Binary Search Tree:

Insert, delete and search: Average case: O(log n), Worst Case: O(n)

Red-Black Tree:

Insert, delete and search: Average case: O(log n), Worst Case: O(log n)

Heap/PriorityQueue (min/max):

Find Min/Find Max: O(1)
Insert: O(log n)
Delete Min/Delete Max: O(log n)
Extract Min/Extract Max: O(log n)
Lookup, Delete (if at all provided): O(n), we will have to scan all the elements as they are not ordered like BST

HashMap/Hashtable/HashSet:

Insert/Delete: O(1) amortized
Re-size/hash: O(n)
Contains: O(1)

How to paste text to end of every line? Sublime 2

Yeah Regex is cool, but there are other alternative.

Select all the lines you want to prefix or suffix
Goto menu Selection -> Split into Lines (Cmd/Ctrl + Shift + L)

This allows you to edit multiple lines at once. Now you can add *Quotes (") or anything * at start and end of each lines.

CSS horizontal centering of a fixed div?

... or you can wrap you menu div in another:

    <div id="wrapper">
       <div id="menu">
       </div>
    </div>


#wrapper{
         width:800px;
         background: rgba(255, 255, 255, 0.8);
         margin:30px auto;
         border:1px solid red;
    }

    #menu{
        position:fixed;
        border:1px solid green;
        width:300px;
        height:30px;
    }

How do I center text horizontally and vertically in a TextView?

You can set the gravity to center vertical and textalignment to center.

<TextView
     android:text="@string/yourText"
     android layout_height="wrap_content"
     android layout_height="wrap_content"
     android:gravity="center_vertical"
     android:textAlignment="center" />

nginx server_name wildcard or catch-all

Android Reading from an Input stream efficiently

What about this. Seems to give better performance.

byte[] bytes = new byte[1000];

StringBuilder x = new StringBuilder();

int numRead = 0;
while ((numRead = is.read(bytes)) >= 0) {
    x.append(new String(bytes, 0, numRead));
}

Edit: Actually this sort of encompasses both steelbytes and Maurice Perry's

jquery to validate phone number

Your regex should be something like

[0-9\-\s]+.

It matches numbers, dashes, parentheses and space.

If you need something more strict, matching just your example, try this:

([0-9]{10})|($[0-9]{3}$\s+[0-9]{3}\-[0-9]{4})

Check for installed packages before running install.packages()

How to declare 2D array in bash

Another approach is you can represent each row as a string, i.e. mapping the 2D array into an 1D array. Then, all you need to do is unpack and repack the row's string whenever you make an edit:

# Init a 4x5 matrix
a=("00 01 02 03 04" "10 11 12 13 14" "20 21 22 23 24" "30 31 32 33 34")

aset() {
  row=$1
  col=$2
  value=$3
  IFS=' ' read -r -a tmp <<< "${a[$row]}"
  tmp[$col]=$value
  a[$row]="${tmp[@]}"
}

# Set a[2][3] = 9999
aset 2 3 9999

# Show result
for r in "${a[@]}"; do
  echo $r
done

Outputs:

00 01 02 03 04
10 11 12 13 14
20 21 22 9999 24
30 31 32 33 34

Cannot open include file: 'unistd.h': No such file or directory

If you're using ZLib in your project, then you need to find :

#if 1

in zconf.h and replace(uncomment) it with :

#if HAVE_UNISTD_H /* ...the rest of the line

If it isn't ZLib I guess you should find some alternative way to do this. GL.

How to get the Power of some Integer in Swift language?

The other answers are great but if preferred, you can also do it with an Int extension so long as the exponent is positive.

extension Int {   
    func pow(toPower: Int) -> Int {
        guard toPower > 0 else { return 0 }
        return Array(repeating: self, count: toPower).reduce(1, *)
    }
}

2.pow(toPower: 8) // returns 256

Python - Move and overwrite files and folders

If you also need to overwrite files with read only flag use this:

def copyDirTree(root_src_dir,root_dst_dir):
"""
Copy directory tree. Overwrites also read only files.
:param root_src_dir: source directory
:param root_dst_dir:  destination directory
"""
for src_dir, dirs, files in os.walk(root_src_dir):
    dst_dir = src_dir.replace(root_src_dir, root_dst_dir, 1)
    if not os.path.exists(dst_dir):
        os.makedirs(dst_dir)
    for file_ in files:
        src_file = os.path.join(src_dir, file_)
        dst_file = os.path.join(dst_dir, file_)
        if os.path.exists(dst_file):
            try:
                os.remove(dst_file)
            except PermissionError as exc:
                os.chmod(dst_file, stat.S_IWUSR)
                os.remove(dst_file)

        shutil.copy(src_file, dst_dir)

Using variables inside a bash heredoc

Don't use quotes with <<EOF:

var=$1
sudo tee "/path/to/outfile" > /dev/null <<EOF
Some text that contains my $var
EOF

Variable expansion is the default behavior inside of here-docs. You disable that behavior by quoting the label (with single or double quotes).

.htaccess file to allow access to images folder to view pictures?

Create a .htaccess file in the images folder and add this

<IfModule mod_rewrite.c>
RewriteEngine On
# directory browsing
Options All +Indexes
</IfModule>

you can put this Options All -Indexes in the project file .htaccess ,file to deny direct access to other folders.

This does what you want

How to count lines of Java code using IntelliJ IDEA?

Although it is not an IntelliJ option, you could use a simple Bash command (if your operating system is Linux/Unix). Go to your source directory and type:

find . -type f -name '*.java' | xargs cat | wc -l

How to detect Windows 64-bit platform with .NET?

I found this to be the best way to check for the platform of the system and the process:

bool 64BitSystem = Environment.Is64BitOperatingSystem;
bool 64BitProcess = Environment.Is64BitProcess;

The first property returns true for 64-bit system, and false for 32-bit. The second property returns true for 64-bit process, and false for 32-bit.

The need for these two properties is because you can run 32-bit processes on 64-bit system, so you will need to check for both the system and the process.

How do I use the JAVA_OPTS environment variable?

Just figured it out in Oracle Java the environmental variable is called: JAVA_TOOL_OPTIONS rather than JAVA_OPTS

Enable/Disable a dropdownbox in jquery

I am using JQuery > 1.8 and this works for me...

$('#dropDownId').attr('disabled', true);

Remove Android App Title Bar

Simple way
getSupportActionBar().hide();

Kotlin: supportActionBar?.hide()

How to use GNU Make on Windows?

Here's how I got it to work:

  copy c:\MinGW\bin\mingw32-make.exe c:\MinGW\bin\make.exe

Then I am able to open a command prompt and type make:

  C:\Users\Dell>make
  make: *** No targets specified and no makefile found.  Stop.

Which means it's working now!

PHP Notice: Undefined offset: 1 with array when reading data

How to reproduce the above error in PHP:

php> $yarr = array(3 => 'c', 4 => 'd');

php> echo $yarr[4];
d

php> echo $yarr[1];
PHP Notice:  Undefined offset: 1 in 
/usr/local/lib/python2.7/dist-packages/phpsh/phpsh.php(578) : 
eval()'d code on line 1

What does that error message mean?

It means the php compiler looked for the key 1 and ran the hash against it and didn't find any value associated with it then said Undefined offset: 1

How do I make that error go away?

Ask the array if the key exists before returning its value like this:

php> echo array_key_exists(1, $yarr);

php> echo array_key_exists(4, $yarr);
1

If the array does not contain your key, don't ask for its value. Although this solution makes double-work for your program to "check if it's there" and then "go get it".

Alternative solution that's faster:

If getting a missing key is an exceptional circumstance caused by an error, it's faster to just get the value (as in echo $yarr[1];), and catch that offset error and handle it like this: https://stackoverflow.com/a/5373824/445131

Invalid argument supplied for foreach()

How about this solution:

$type = gettype($your_iteratable);
$types = array(
    'array',
    'object'
);

if (in_array($type, $types)) {
    // foreach code comes here
}

Return multiple values from a function, sub or type?

you can return 2 or more values to a function in VBA or any other visual basic stuff but you need to use the pointer method called Byref. See my example below. I will make a function to add and subtract 2 values say 5,6

sub Macro1
    ' now you call the function this way
    dim o1 as integer, o2 as integer
    AddSubtract 5, 6, o1, o2
    msgbox o2
    msgbox o1
end sub


function AddSubtract(a as integer, b as integer, ByRef sum as integer, ByRef dif as integer)
    sum = a + b
    dif = b - 1
end function

Detect if the device is iPhone X

I was using Peter Kreinz's code (because it was clean and did what I needed) but then I realized it works just when the device is on portrait (since top padding will be on top, obviously) So I created an extension to handle all the orientations with its respective paddings, without relaying on the screen size:

extension UIDevice {

    var isIphoneX: Bool {
        if #available(iOS 11.0, *), isIphone {
            if isLandscape {
                if let leftPadding = UIApplication.shared.keyWindow?.safeAreaInsets.left, leftPadding > 0 {
                    return true
                }
                if let rightPadding = UIApplication.shared.keyWindow?.safeAreaInsets.right, rightPadding > 0 {
                    return true
                }
            } else {
                if let topPadding = UIApplication.shared.keyWindow?.safeAreaInsets.top, topPadding > 0 {
                    return true
                }
                if let bottomPadding = UIApplication.shared.keyWindow?.safeAreaInsets.bottom, bottomPadding > 0 {
                    return true
                }
            }
        }
        return false
    }

    var isLandscape: Bool {
        return UIDeviceOrientationIsLandscape(orientation) || UIInterfaceOrientationIsLandscape(UIApplication.shared.statusBarOrientation)
    }

    var isPortrait: Bool {
        return UIDeviceOrientationIsPortrait(orientation) || UIInterfaceOrientationIsPortrait(UIApplication.shared.statusBarOrientation)
    }

    var isIphone: Bool {
        return self.userInterfaceIdiom == .phone
    }

    var isIpad: Bool {
        return self.userInterfaceIdiom == .pad
    }
}

And on your call site you just:

let res = UIDevice.current.isIphoneX

How to prevent caching of my Javascript file?

You can add a random (or datetime string) as query string to the url that points to your script. Like so:

<script type="text/javascript" src="test.js?q=123"></script>

Every time you refresh the page you need to make sure the value of 'q' is changed.

HTML5 : Iframe No scrolling?

In HTML5 there is no scrolling attribute because "its function is better handled by CSS" see http://www.w3.org/TR/html5-diff/ for other changes. Well and the CSS solution:

CSS solution:

HTML4's scrolling="no" is kind of an alias of the CSS's overflow: hidden, to do so it is important to set size attributes width/height:

iframe.noScrolling{
  width: 250px; /*or any other size*/
  height: 300px; /*or any other size*/
  overflow: hidden;
}

Add this class to your iframe and you're done:

<iframe src="http://www.example.com/" class="noScrolling"></iframe>

! IMPORTANT NOTE ! : overflow: hidden for <iframe> is not fully supported by all modern browsers yet(even chrome doesn't support it yet) so for now (2013) it's still better to use Transitional version and use scrolling="no" and overflow:hidden at the same time :)

UPDATE 2020: the above is still true, oveflow for iframes is still not supported by all majors

Mock functions in Go

Considering unit test is the domain of this question, highly recommend you to use monkey. This Package make you to mock test without changing your original source code. Compare to other answer, it's more "non-intrusive".

main

type AA struct {
 //...
}
func (a *AA) OriginalFunc() {
//...
}

mock test

var a *AA

func NewFunc(a *AA) {
 //...
}

monkey.PatchMethod(reflect.TypeOf(a), "OriginalFunc", NewFunc)

Bad side is:

Reminded by Dave.C, This method is unsafe. So don't use it outside of unit test.
Is non-idiomatic Go.

Good side is:

Is non-intrusive. Make you do things without changing the main code. Like Thomas said.
Make you change behavior of package (maybe provided by third party) with least code.

How to check which version of Keras is installed?

Python library authors put the version number in <module>.__version__. You can print it by running this on the command line:

python -c 'import keras; print(keras.__version__)'

If it's Windows terminal, enclose snippet with double-quotes like below

python -c "import keras; print(keras.__version__)"

Javascript Date Validation ( DD/MM/YYYY) & Age Checking

You can use attributes of html tag instead of validation from html input type ="date" can be used instead of validating it. That's the benifits html 5 gives you

How to change default language for SQL Server?

If you want to change MSSQL server language, you can use the following QUERY:

EXEC sp_configure 'default language', 'British English';

Session TimeOut in web.xml

You can see many options as answer for your question, however you can use "-1" where the session never expires. Since you do not know how much time it will take for the thread to complete. E.g.:

   <session-config>
        <session-timeout>-1</session-timeout>
    </session-config>

Or if you don't want a timeout happening for some purpose:

<session-config>
    <session-timeout>0</session-timeout>
</session-config>

Another option could be increase the number to 1000, etc, etc, bla, bla, bla.

But if you really want to stop and you consider that is unnecessary for your application to force the user to logout, just add a logout button and the user will decide when to leave.

Here is what you can do to solve the problem if you do not need to force to logout, and in you are loading files that could take time base on server and your computer speed and the size of the file.

<!-- sets the default session timeout to 60 minutes. -->
   <!-- <session-config>
     <session-timeout>60</session-timeout>
   </session-config> -->

Just comment it or deleted that's it! Tan tararantan, tan tan!

Apache Spark: map vs mapPartitions?

Map :

It processes one row at a time , very similar to map() method of MapReduce.

You return from the transformation after every row.

MapPartitions

It processes the complete partition in one go.

You can return from the function only once after processing the whole partition.

All intermediate results needs to be held in memory till you process the whole partition.

Provides you like setup() map() and cleanup() function of MapReduce

Map Vs mapPartitions http://bytepadding.com/big-data/spark/spark-map-vs-mappartitions/

Spark Map http://bytepadding.com/big-data/spark/spark-map/

Spark mapPartitions http://bytepadding.com/big-data/spark/spark-mappartitions/

Force SSL/https using .htaccess and mod_rewrite

PHP Solution

Borrowing directly from Gordon's very comprehensive answer, I note that your question mentions being page-specific in forcing HTTPS/SSL connections.

function forceHTTPS(){
  $httpsURL = 'https://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
  if( count( $_POST )>0 )
    die( 'Page should be accessed with HTTPS, but a POST Submission has been sent here. Adjust the form to point to '.$httpsURL );
  if( !isset( $_SERVER['HTTPS'] ) || $_SERVER['HTTPS']!=='on' ){
    if( !headers_sent() ){
      header( "Status: 301 Moved Permanently" );
      header( "Location: $httpsURL" );
      exit();
    }else{
      die( '<script type="javascript">document.location.href="'.$httpsURL.'";</script>' );
    }
  }
}

Then, as close to the top of these pages which you want to force to connect via PHP, you can require() a centralised file containing this (and any other) custom functions, and then simply run the forceHTTPS() function.

HTACCESS / mod_rewrite Solution

I have not implemented this kind of solution personally (I have tended to use the PHP solution, like the one above, for it's simplicity), but the following may be, at least, a good start.

RewriteEngine on

# Check for POST Submission
RewriteCond %{REQUEST_METHOD} !^POST$

# Forcing HTTPS
RewriteCond %{HTTPS} !=on [OR]
RewriteCond %{SERVER_PORT} 80
# Pages to Apply
RewriteCond %{REQUEST_URI} ^something_secure [OR]
RewriteCond %{REQUEST_URI} ^something_else_secure
RewriteRule .* https://%{SERVER_NAME}%{REQUEST_URI} [R=301,L]

# Forcing HTTP
RewriteCond %{HTTPS} =on [OR]
RewriteCond %{SERVER_PORT} 443
# Pages to Apply
RewriteCond %{REQUEST_URI} ^something_public [OR]
RewriteCond %{REQUEST_URI} ^something_else_public
RewriteRule .* http://%{SERVER_NAME}%{REQUEST_URI} [R=301,L]

How do you install an APK file in the Android emulator?

From Windows 7 Onwards ,

Shift + Right click in your apk file folder.

Select Open Command Window Here

Type & Hit "adb install AppName.apk"

Using IS NULL or IS NOT NULL on join conditions - Theory question

The WHERE clause is evaluated after the JOIN conditions have been processed.

How can I render Partial views in asp.net mvc 3?

<%= Html.Partial("PartialName", Model) %>

Disable activity slide-in animation when launching new activity?

Apply

startActivity(new Intent(FirstActivity.this,SecondActivity.class));

then

overridePendingTransition(0, 0);

This will stop the animation.

How do I add 24 hours to a unix timestamp in php?

A Unix timestamp is simply the number of seconds since January the first 1970, so to add 24 hours to a Unix timestamp we just add the number of seconds in 24 hours. (24 * 60 *60)

time() + 24*60*60;

convert UIImage to NSData

Use if-let block with Data to prevent app crash & safe execution of code, as function UIImagePNGRepresentation returns an optional value.

if let img = UIImage(named: "TestImage.png") {
    if let data:Data = UIImagePNGRepresentation(img) {
       // Handle operations with data here...         
    }
}

Note: Data is Swift 3 class. Use Data instead of NSData with Swift 3

Generic image operations (like png & jpg both):

if let img = UIImage(named: "TestImage.png") {  //UIImage(named: "TestImage.jpg")
        if let data:Data = UIImagePNGRepresentation(img) {
               handleOperationWithData(data: data)     
        } else if let data:Data = UIImageJPEGRepresentation(img, 1.0) {
               handleOperationWithData(data: data)     
        }
}

*******
func handleOperationWithData(data: Data) {
     // Handle operations with data here...
     if let image = UIImage(data: data) {
        // Use image...
     }
}

By using extension:

extension UIImage {

    var pngRepresentationData: Data? {
        return UIImagePNGRepresentation(img)
    }

    var jpegRepresentationData: Data? {
        return UIImageJPEGRepresentation(self, 1.0)
    }
}

*******
if let img = UIImage(named: "TestImage.png") {  //UIImage(named: "TestImage.jpg")
      if let data = img.pngRepresentationData {
              handleOperationWithData(data: data)     
      } else if let data = img.jpegRepresentationData {
              handleOperationWithData(data: data)     
     }
}

*******
func handleOperationWithData(data: Data) {
     // Handle operations with data here...
     if let image = UIImage(data: data) {
        // Use image...
     }
}

How to erase the file contents of text file in Python?

Writing and Reading file content

def writeTempFile(text = ''):
    filePath = "/temp/file1.txt"
    if not text:                      # If blank return file content
        f = open(filePath, "r")
        slug = f.read()
        return slug
    else:
        f = open(filePath, "a") # Create a blank file
        f.seek(0)  # sets  point at the beginning of the file
        f.truncate()  # Clear previous content
        f.write(text) # Write file
        f.close() # Close file
        return text

It Worked for me

Countdown timer using Moment js

You're not using react native or react so forgive me this isn't a solution for you. - since this is a 7 year old post I'm pretty sure you figured it out by now ;)

But I was looking for something similar for react-native and it led me to this SO question. Incase anyone else winds up down the same road I thought I'd share my use-moment-countdown hook for react or react native: https://github.com/BrooklinJazz/use-moment-countdown.

For example you can make a 10 minute timer like so:

import React from 'react'

import  { useCountdown } from 'use-moment-countdown'

const App = () => {
  const {start, time} = useCountdown({m: 10})
  return (
    <div onClick={start}>
      {time.format("hh:mm:ss")}
    </div>
  )
}

export default App

JavaScript variable assignments from tuples

You can have a tuple type in Javascript as well. Just define it with higher order functions (the academic term is Church encoding):

_x000D_

const Tuple = (...args) => {_x000D_
  const Tuple = f => f(...args);_x000D_
  return Object.freeze(Object.assign(Tuple, args));_x000D_
};_x000D_
_x000D_
const get1 = tx => tx((x, y) => x);_x000D_
_x000D_
const get2 = tx => tx((x, y) => y);_x000D_
_x000D_
const bimap = f => g => tx => tx((x, y) => Tuple(f(x), g(y)));_x000D_
_x000D_
const toArray = tx => tx((...args) => args);_x000D_
_x000D_
// aux functions_x000D_
_x000D_
const inc = x => x + 1;_x000D_
const toUpperCase = x => x.toUpperCase();_x000D_
_x000D_
// mock data_x000D_
_x000D_
const pair = Tuple(1, "a");_x000D_
_x000D_
// application_x000D_
_x000D_
console.assert(get1(pair) === 1);_x000D_
console.assert(get2(pair) === "a");_x000D_
_x000D_
const {0:x, 1:y} = pair;_x000D_
console.log(x, y); // 1 a_x000D_
_x000D_
console.log(toArray(bimap(inc) (toUpperCase) (pair))); // [2, "A"]_x000D_
_x000D_
const map = new Map([Tuple(1, "a"), Tuple(2, "b")]);_x000D_
console.log(map.get(1), map.get(2)); // a b

_x000D_

Please note that Tuple isn't used as a normal constructor. The solution doesn't rely on the prototype system at all, but solely on higher order functions.

What are the advantages of tuples over Arrays used like tuples? Church encoded tuples are immutable by design and thus prevent side effects caused by mutations. This helps to build more robust applications. Additionally, it is easier to reason about code that distinguishes between Arrays as a collection type (e.g. [a]) and tuples as related data of various types (e.g. (a, b)).

How to get text and a variable in a messagebox

As has been suggested, using the string.format method is nice and simple and very readable.

In vb.net the " + " is used for addition and the " & " is used for string concatenation.

In your example:

MsgBox("Variable = " + variable)

becomes:

MsgBox("Variable = " & variable)

I may have been a bit quick answering this as it appears these operators can both be used for concatenation, but recommended use is the "&", source http://msdn.microsoft.com/en-us/library/te2585xw(v=VS.100).aspx

maybe call

variable.ToString()

update:

Use string interpolation (vs2015 onwards I believe):

MsgBox($"Variable = {variable}")

pip installation /usr/local/opt/python/bin/python2.7: bad interpreter: No such file or directory

Because I had both python 2 and 3 installed on Mac OSX I was having all sorts of errors.

I used which to find the location of my python2.7 file (/usr/local/bin/python2.7)

which python2.7

Then I symlinked my real python2.7 install location with the one the script expected:

ln -s /usr/local/bin/python2.7 /usr/local/opt/python/bin/python2.7

python pandas dataframe columns convert to dict key and value

You can also do this if you want to play around with pandas. However, I like punchagan's way.

# replicating your dataframe
lake = pd.DataFrame({'co tp': ['DE Lake', 'Forest', 'FR Lake', 'Forest'], 
                 'area': [10, 20, 30, 40], 
                 'count': [7, 5, 2, 3]})
lake.set_index('co tp', inplace=True)

# to get key value using pandas
area_dict = lake.set_index('area').T.to_dict('records')[0]
print(area_dict)

output: {10: 7, 20: 5, 30: 2, 40: 3}

How to add composite primary key to table

alter table d add constraint pkc_Name primary key (id, code)

should do it. There's lots of options to a basic primary key/index depending on what DB your working with.

Python, how to read bytes from file and save it?

In my examples I use the 'b' flag ('wb', 'rb') when opening the files because you said you wanted to read bytes. The 'b' flag tells Python not to interpret end-of-line characters which can differ between operating systems. If you are reading text, then omit the 'b' and use 'w' and 'r' respectively.

This reads the entire file in one chunk using the "simplest" Python code. The problem with this approach is that you could run out memory when reading a large file:

ifile = open(input_filename,'rb')
ofile = open(output_filename, 'wb')
ofile.write(ifile.read())
ofile.close()
ifile.close()

This example is refined to read 1MB chunks to ensure it works for files of any size without running out of memory:

ifile = open(input_filename,'rb')
ofile = open(output_filename, 'wb')
data = ifile.read(1024*1024)
while data:
    ofile.write(data)
    data = ifile.read(1024*1024)
ofile.close()
ifile.close()

This example is the same as above but leverages using with to create a context. The advantage of this approach is that the file is automatically closed when exiting the context:

with open(input_filename,'rb') as ifile:
    with open(output_filename, 'wb') as ofile:
        data = ifile.read(1024*1024)
        while data:
            ofile.write(data)
            data = ifile.read(1024*1024)

See the following:

Python open(): http://docs.python.org/library/functions.html#open
Python read(): http://docs.python.org/library/stdtypes.html#file.read
Python write(): http://docs.python.org/library/stdtypes.html#file.write
Dive into Python File Object Tutorial: http://diveintopython.net/file_handling/file_objects.html

How to insert new cell into UITableView in Swift

Here is your code for add data into both tableView:

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

    @IBOutlet weak var table1Text: UITextField!
    @IBOutlet weak var table2Text: UITextField!
    @IBOutlet weak var table1: UITableView!
    @IBOutlet weak var table2: UITableView!

    var table1Data = ["a"]
    var table2Data = ["1"]

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func addData(sender: AnyObject) {

        //add your data into tables array from textField
        table1Data.append(table1Text.text)
        table2Data.append(table2Text.text)

        dispatch_async(dispatch_get_main_queue(), { () -> Void in
            //reload your tableView
            self.table1.reloadData()
            self.table2.reloadData()
        })


        table1Text.resignFirstResponder()
        table2Text.resignFirstResponder()
    }

    //delegate methods
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if tableView == table1 {
            return table1Data.count
        }else if tableView == table2 {
            return table2Data.count
        }
        return Int()
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

        if tableView == table1 {
            let cell = table1.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell

            let row = indexPath.row
            cell.textLabel?.text = table1Data[row]

            return cell
        }else if tableView == table2 {

            let cell = table2.dequeueReusableCellWithIdentifier("Cell1", forIndexPath: indexPath) as! UITableViewCell

            let row = indexPath.row
            cell.textLabel?.text = table2Data[row]

            return cell
        }

        return UITableViewCell()
    }
}

And your result will be:

How can I change the user on Git Bash?

For Mac Users

I am using Mac and I was facing same problem while I was trying to push a project from Android Studio. The reason for that other user had previously logged into Github and his credentials were saved in Keychain Access.

You need to remove those credentials from Keychain Access and then try to push.

Hope it help to Mac users.

What is the difference between an Instance and an Object?

The Instance and Object are from Object Oriented Programming.

For some programming languages like Java, C++, and Smalltalk, it is important to describe and understand code. In other languages that used in Structured Programming, this concept doesn't exist.

This is a view from Structural Programming. There's no real significant difference that should consume too much of your time. There might be some fancy language that some people might take up a lot of spaces to write about, but at the end of the day, as far as a coder, developer, programmer, architect, is concerned, an instance of a class and an object mean the same thing and can often be used interchangeably. I have never met anyone in my career that would be picky and spend a half-hour trying to point out the differences because there's really none. Time can be better spent on other development efforts.

UPDATE With regards to Swift, this is what Apple who invented Swift prefers :

An instance of a class is traditionally known as an object. However, Swift classes and structures are much closer in functionality than in other languages, and much of this chapter describes functionality that can apply to instances of either a class or a structure type. Because of this, the more general term instance is used.

Add Favicon to Website

This is not done in PHP. It's part of the <head> tags in a HTML page.
That icon is called a favicon. According to Wikipedia:

A favicon (short for favorites icon), also known as a shortcut icon, website icon, URL icon, or bookmark icon is a 16×16 or 32×32 pixel square icon associated with a particular website or webpage.
Adding it is easy. Just add an .ico image file that is either 16x16 pixels or 32x32 pixels. Then, in the web pages, add <link rel="shortcut icon" href="favicon.ico" type="image/x-icon"> to the <head> element.
You can easily generate favicons here.

Set cellpadding and cellspacing in CSS?

From what I understand from the W3C classifications is that <table>s are meant for displaying data 'only'.

Based on that I found it a lot easier to create a <div> with the backgrounds and all that and have a table with data floating over it using position: absolute; and background: transparent;...

It works on Chrome, Internet Explorer (6 and later) and Mozilla Firefox (2 and later).

Margins are used (or meant anyways) to create a spacer between container elements, like <table>, <div> and <form>, not <tr>, <td>, <span> or <input>. Using it for anything other than container elements will keep you busy adjusting your website for future browser updates.

Difference between return and exit in Bash functions

Remember, functions are internal to a script and normally return from whence they were called by using the return statement. Calling an external script is another matter entirely, and scripts usually terminate with an exit statement.

The difference "between the return and exit statement in Bash functions with respect to exit codes" is very small. Both return a status, not values per se. A status of zero indicates success, while any other status (1 to 255) indicates a failure. The return statement will return to the script from where it was called, while the exit statement will end the entire script from wherever it is encountered.

return 0  # Returns to where the function was called.  $? contains 0 (success).

return 1  # Returns to where the function was called.  $? contains 1 (failure).

exit 0  # Exits the script completely.  $? contains 0 (success).

exit 1  # Exits the script completely.  $? contains 1 (failure).

If your function simply ends without a return statement, the status of the last command executed is returned as the status code (and will be placed in $?).

Remember, return and exit give back a status code from 0 to 255, available in $?. You cannot stuff anything else into a status code (e.g., return "cat"); it will not work. But, a script can pass back 255 different reasons for failure by using status codes.

You can set variables contained in the calling script, or echo results in the function and use command substitution in the calling script; but the purpose of return and exit are to pass status codes, not values or computation results as one might expect in a programming language like C.

Get a list of dates between two dates

This solution is working with MySQL 5.0
Create a table - mytable.
The schema does not material. What matters is the number of rows in it.
So, you can keep just one column of type INT with 10 rows, values - 1 to 10.

SQL:

set @tempDate=date('2011-07-01') - interval 1 day;
select
date(@tempDate := (date(@tempDate) + interval 1 day)) as theDate
from mytable x,mytable y
group by theDate
having theDate <= '2011-07-31';

Limitation: The maximum number of dates returned by above query will be
(rows in mytable)*(rows in mytable) = 10*10 = 100.

You can increase this range by changing form part in sql:
from mytable x,mytable y, mytable z
So, the range be 10*10*10 =1000 and so on.

"Could not find the main class" error when running jar exported by Eclipse

For netbeans user that having this problem is as simply:

1.Go to your Project and Right Click and Select Properties

2.Click Run and also click browser.

3.Select your frames you want to first appear.

Sort array of objects by string property value

I came into problem of sorting array of objects, with changing priority of values, basically I want to sort array of peoples by their Age, and then by surname - or just by surname, name. I think that this is most simple solution compared to another answers.

it' is used by calling sortPeoples(['array', 'of', 'properties'], reverse=false)

_x000D_

///////////////////////example array of peoples ///////////////////////_x000D_
_x000D_
var peoples = [_x000D_
    {name: "Zach", surname: "Emergency", age: 1},_x000D_
    {name: "Nancy", surname: "Nurse", age: 1},_x000D_
    {name: "Ethel", surname: "Emergency", age: 1},_x000D_
    {name: "Nina", surname: "Nurse", age: 42},_x000D_
    {name: "Anthony", surname: "Emergency", age: 42},_x000D_
    {name: "Nina", surname: "Nurse", age: 32},_x000D_
    {name: "Ed", surname: "Emergency", age: 28},_x000D_
    {name: "Peter", surname: "Physician", age: 58},_x000D_
    {name: "Al", surname: "Emergency", age: 58},_x000D_
    {name: "Ruth", surname: "Registration", age: 62},_x000D_
    {name: "Ed", surname: "Emergency", age: 38},_x000D_
    {name: "Tammy", surname: "Triage", age: 29},_x000D_
    {name: "Alan", surname: "Emergency", age: 60},_x000D_
    {name: "Nina", surname: "Nurse", age: 58}_x000D_
];_x000D_
_x000D_
_x000D_
_x000D_
//////////////////////// Sorting function /////////////////////_x000D_
function sortPeoples(propertyArr, reverse) {_x000D_
        function compare(a,b) {_x000D_
            var i=0;_x000D_
            while (propertyArr[i]) {_x000D_
                if (a[propertyArr[i]] < b[propertyArr[i]])  return -1;_x000D_
                if (a[propertyArr[i]] > b[propertyArr[i]])  return 1;_x000D_
                i++;_x000D_
            }_x000D_
            return 0;_x000D_
            }_x000D_
        peoples.sort(compare);_x000D_
        if (reverse){_x000D_
            peoples.reverse();_x000D_
        }_x000D_
    };_x000D_
_x000D_
////////////////end of sorting method///////////////_x000D_
function printPeoples(){_x000D_
  $('#output').html('');_x000D_
peoples.forEach( function(person){_x000D_
 $('#output').append(person.surname+" "+person.name+" "+person.age+"<br>");_x000D_
} )_x000D_
}

_x000D_

<head>_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
</head>_x000D_
  <html>_x000D_
  <body>_x000D_
<button onclick="sortPeoples(['surname']); printPeoples()">sort by ONLY by surname ASC results in mess with same name cases</button><br>_x000D_
<button onclick="sortPeoples(['surname', 'name'], true); printPeoples()">sort by surname then name DESC</button><br>_x000D_
<button onclick="sortPeoples(['age']); printPeoples()">sort by AGE ASC. Same issue as in first case</button><br>_x000D_
<button onclick="sortPeoples(['age', 'surname']); printPeoples()">sort by AGE and Surname ASC. Adding second field fixed it.</button><br>_x000D_
        _x000D_
    <div id="output"></div>_x000D_
    </body>_x000D_
  </html>

_x000D_

how to get the current working directory's absolute path from irb

As for the path relative to the current executing script, since Ruby 2.0 you can also use

__dir__

So this is basically the same as

File.dirname(__FILE__)

Google Maps API v3: InfoWindow not sizing correctly

I tried each one of the answers listed. None worked for me. This finally fixed it PERMANENTLY. The code I inherited had a DIV wrapper around all the <h#> and <p> entries. I simply forced some "style" in the same DIV, taking into account a desired max width, threw in the line height change just in case (someone else's fix) and my own white-space: nowrap, which then made the auto overflow make the correct adjustments. No scroll bar, no truncation and no problems!

html = '<div class="map-overlay" style="max-width: 400px;
                                        line-height: normal;
                                        white-space: nowrap;
                                        overflow: auto;
                                       ">';

How to log Apache CXF Soap Request and Soap Response using Log4j?

In case somebody wants to do this, using Play Framework (and using LogBack http://logback.qos.ch/), then you can configure the application-logger.xml with this line:

 <logger name="org.apache.cxf" level="DEBUG"/>

For me, it did the trick ;)

MVC 3: How to render a view without its layout page when loaded via ajax?

With ASP.NET 5 there is no Request variable available anymore. You can access it now with Context.Request

Also there is no IsAjaxRequest() Method anymore, you have to write it by yourself, for example in Extensions\HttpRequestExtensions.cs

using System;
using Microsoft.AspNetCore.Http;

namespace Microsoft.AspNetCore.Mvc
{
    public static class HttpRequestExtensions
    {
        public static bool IsAjaxRequest(this HttpRequest request)
        {
            if (request == null)
            {
                throw new ArgumentNullException(nameof(request));
            }

            return (request.Headers != null) && (request.Headers["X-Requested-With"] == "XMLHttpRequest");
        }
    }
}

I searched for a while now on this and hope that will help some others too ;)

Resource: https://github.com/aspnet/AspNetCore/issues/2729

Error in eval(expr, envir, enclos) : object not found

i use colname(train) = paste("A", colname(train)) and it turns out to the same problem as yours.

I finally figure out that randomForest is more stingy than rpart, it can't recognize the colname with space, comma or other specific punctuation.

paste function will prepend "A" and " " as seperator with each colname. so we need to avert the space and use this sentence instead:

colname(train) = paste("A", colname(train), sep = "")

this will prepend string without space.

How to get a microtime in Node.js?

now('milli'); //  120335360.999686
now('micro') ; // 120335360966.583
now('nano') ; //  120335360904333

Known that now is :

const now = (unit) => {
  
  const hrTime = process.hrtime();
  
  switch (unit) {
    
    case 'milli':
      return hrTime[0] * 1000 + hrTime[1] / 1000000;
      
    case 'micro':
      return hrTime[0] * 1000000 + hrTime[1] / 1000;
      
    case 'nano':
    default:
      return hrTime[0] * 1000000000 + hrTime[1];
  }
  
};

jQuery - Detecting if a file has been selected in the file input

I'd suggest try the change event? test to see if it has a value if it does then you can continue with your code. jQuery has

.bind("change", function(){ ... });

.change(function(){ ... });

which are equivalents.

http://api.jquery.com/change/

for a unique selector change your name attribute to id and then jQuery("#imafile") or a general jQuery('input[type="file"]') for all the file inputs

PHP compare time

$ThatTime ="14:08:10";
if (time() >= strtotime($ThatTime)) {
  echo "ok";
}

A solution using DateTime (that also regards the timezone).

$dateTime = new DateTime($ThatTime);
if ($dateTime->diff(new DateTime)->format('%R') == '+') {
  echo "OK";
}

http://php.net/datetime.diff

How to hide the title bar for an Activity in XML with existing custom theme

If you use this.requestWindowFeature(Window.FEATURE_NO_TITLE) user will still be able to see the title bar just for a moment during launch animation when activity starts through onCreate. If you use @android:style/Theme.Black.NoTitleBar as shown below then title bar won't be shown during launch animation.

<activity 
    android:name=".MainActivity" 
    android:label="My App"
    android:theme="@android:style/Theme.Black.NoTitleBar"
    android:screenOrientation="portrait">

above example will obviously override your existing application theme, if you have existing theme then add <item name="android:windowNoTitle">true</item> to it.

How to check a channel is closed or not without reading it?

You could set your channel to nil in addition to closing it. That way you can check if it is nil.

example in the playground: https://play.golang.org/p/v0f3d4DisCz

edit: This is actually a bad solution as demonstrated in the next example, because setting the channel to nil in a function would break it: https://play.golang.org/p/YVE2-LV9TOp

Android changing Floating Action Button color

use

app:backgroundTint="@color/orange" in


<com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/id_share_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/share"
        app:backgroundTint="@color/orange"
        app:fabSize="mini"
        app:layout_anchorGravity="end|bottom|center" />



</androidx.coordinatorlayout.widget.CoordinatorLayout>

Use of the MANIFEST.MF file in Java

The content of the Manifest file in a JAR file created with version 1.0 of the Java Development Kit is the following.

Manifest-Version: 1.0

All the entries are as name-value pairs. The name of a header is separated from its value by a colon. The default manifest shows that it conforms to version 1.0 of the manifest specification. The manifest can also contain information about the other files that are packaged in the archive. Exactly what file information is recorded in the manifest will depend on the intended use for the JAR file. The default manifest file makes no assumptions about what information it should record about other files, so its single line contains data only about itself. Special-Purpose Manifest Headers

Depending on the intended role of the JAR file, the default manifest may have to be modified. If the JAR file is created only for the purpose of archival, then the MANIFEST.MF file is of no purpose. Most uses of JAR files go beyond simple archiving and compression and require special information to be in the manifest file. Summarized below are brief descriptions of the headers that are required for some special-purpose JAR-file functions

Applications Bundled as JAR Files: If an application is bundled in a JAR file, the Java Virtual Machine needs to be told what the entry point to the application is. An entry point is any class with a public static void main(String[] args) method. This information is provided in the Main-Class header, which has the general form:

Main-Class: classname

The value classname is to be replaced with the application's entry point.

Download Extensions: Download extensions are JAR files that are referenced by the manifest files of other JAR files. In a typical situation, an applet will be bundled in a JAR file whose manifest references a JAR file (or several JAR files) that will serve as an extension for the purposes of that applet. Extensions may reference each other in the same way. Download extensions are specified in the Class-Path header field in the manifest file of an applet, application, or another extension. A Class-Path header might look like this, for example:

Class-Path: servlet.jar infobus.jar acme/beans.jar

With this header, the classes in the files servlet.jar, infobus.jar, and acme/beans.jar will serve as extensions for purposes of the applet or application. The URLs in the Class-Path header are given relative to the URL of the JAR file of the applet or application.

Package Sealing: A package within a JAR file can be optionally sealed, which means that all classes defined in that package must be archived in the same JAR file. A package might be sealed to ensure version consistency among the classes in your software or as a security measure. To seal a package, a Name header needs to be added for the package, followed by a Sealed header, similar to this:

Name: myCompany/myPackage/
Sealed: true

The Name header's value is the package's relative pathname. Note that it ends with a '/' to distinguish it from a filename. Any headers following a Name header, without any intervening blank lines, apply to the file or package specified in the Name header. In the above example, because the Sealed header occurs after the Name: myCompany/myPackage header, with no blank lines between, the Sealed header will be interpreted as applying (only) to the package myCompany/myPackage.

Package Versioning: The Package Versioning specification defines several manifest headers to hold versioning information. One set of such headers can be assigned to each package. The versioning headers should appear directly beneath the Name header for the package. This example shows all the versioning headers:

Name: java/util/
Specification-Title: "Java Utility Classes" 
Specification-Version: "1.2"
Specification-Vendor: "Sun Microsystems, Inc.".
Implementation-Title: "java.util" 
Implementation-Version: "build57"
Implementation-Vendor: "Sun Microsystems, Inc."

relative path to CSS file

You have to move the css folder into your web folder. It seems that your web folder on the hard drive equals the /ServletApp folder as seen from the www. Other content than inside your web folder cannot be accessed from the browsers.

The url of the CSS link is then

 <link rel="stylesheet" type="text/css" href="/ServletApp/css/styles.css"/>

Hide/Show Action Bar Option Menu Item for different fragments

This will work for sure I guess...

// Declare
Menu menu;
MenuItem menuDoneItem;

// Then in your onCreateOptionMenu() method write the following...
@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        this.menu=menu;
        inflater.inflate(R.menu.secutity, menu);
            }

// In your onOptionItemSelected() method write the following...
@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.done_item:
                this.menuDoneItem=item;
                someOperation();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

// Now Making invisible any menu item...
public void menuInvisible(){
setHasOptionsMenu(true);// Take part in populating the action bar menu
            menuDoneItem=(MenuItem)menu.findItem(R.id.done_item);
                menuRefresh.setVisible(false); // make true to make the menu item visible.
}

//Use the above method whenever you need to make your menu item visible or invisiable

You can also refer this link for more details, it is a very useful one.

Unmarshaling nested JSON objects

Is there a way to unmarshal the nested bar property and assign it directly to a struct property without creating a nested struct?

No, encoding/json cannot do the trick with ">some>deep>childnode" like encoding/xml can do. Nested structs is the way to go.

How to remove all duplicate items from a list

This should be faster and will preserve the original order:

seen = {}
new_list = [seen.setdefault(x, x) for x in my_list if x not in seen]

If you don't care about order, you can just:

new_list = list(set(my_list))

LDAP Authentication using Java

You will have to provide the entire user dn in SECURITY_PRINCIPAL

like this

env.put(Context.SECURITY_PRINCIPAL, "cn=username,ou=testOu,o=test");

How to update Ruby Version 2.0.0 to the latest version in Mac OSX Yosemite?

brew install rbenv ruby-build

Add rbenv to bash so that it loads every time you open a terminal

echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.bash_profile

source ~/.bash_profile

Install Ruby

rbenv install 2.6.5

rbenv global 2.6.5

ruby -v

Link to the source page

How to save data file into .RData?

Alternatively, when you want to save individual R objects, I recommend using saveRDS.

You can save R objects using saveRDS, then load them into R with a new variable name using readRDS.

Example:

# Save the city object
saveRDS(city, "city.rds")

# ...

# Load the city object as city
city <- readRDS("city.rds")

# Or with a different name
city2 <- readRDS("city.rds")

But when you want to save many/all your objects in your workspace, use Manetheran's answer.

jQuery Scroll to bottom of page/iframe

This one worked for me:

var elem = $('#box');
if (elem[0].scrollHeight - elem.scrollTop() == elem.outerHeight()) {
  // We're at the bottom.
}

How to connect TFS in Visual Studio code

I know I'm a little late to the party, but I did want to throw some interjections. (I would have commented but not enough reputation points yet, so, here's a full answer).

This requires the latest version of VS Code, Azure Repo Extention, and Git to be installed.

Anyone looking to use the new VS Code (or using the preview like myself), when you go to the Settings (Still File -> Preferences -> Settings or CTRL+, ) you'll be looking under User Settings -> Extensions -> Azure Repos.

Then under Tfvc: Location you can paste the location of the executable.

For 2017 it'll be

C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\TF.exe

Or for 2019 (Preview)

C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\TF.exe

After adding the location, I closed my VS Code (not sure if this was needed) and went my git repo to copy the git URL.

After that, went back into VS Code went to the Command Palette (View -> Command Palette or CTRL+Shift+P) typed Git: Clone pasted my repo:

Selected the location for the repo to be stored. Next was an error that popped up. I proceeded to follow this video which walked me through clicking on the Team button with the exclamation mark on the bottom of your VS Code Screen

Then chose the new method of authentication

Copy by using CTRL+C and then press enter. Your browser will launch a page where you'll enter the code you copied (CTRL+V).

Click Continue

Cheers!

c# how to add byte to byte array

Simple, just use the code below, as I do:

        public void AppendSpecifiedBytes(ref byte[] dst, byte[] src)
    {
        // Get the starting length of dst
        int i = dst.Length;
        // Resize dst so it can hold the bytes in src
        Array.Resize(ref dst, dst.Length + src.Length);
        // For each element in src
        for (int j = 0; j < src.Length; j++)
        {
            // Add the element to dst
            dst[i] = src[j];
            // Increment dst index
            i++;
        }
    }

    // Appends src byte to the dst array
    public void AppendSpecifiedByte(ref byte[] dst, byte src)
    {
        // Resize dst so that it can hold src
        Array.Resize(ref dst, dst.Length + 1);
        // Add src to dst
        dst[dst.Length - 1] = src;
    }

Changing file permission in Python

os.chmod(path, 0444) is the Python command for changing file permissions in Python 2.x. For a combined Python 2 and Python 3 solution, change 0444 to 0o444.

You could always use Python to call the chmod command using subprocess. I think this will only work on Linux though.

import subprocess

subprocess.call(['chmod', '0444', 'path'])

Github permission denied: ssh add agent has no identities

Run the following commands:

ssh-keygen -t rsa
ssh-add /Users/*yourUserNameHere*/.ssh/id_rsa** 
pbcopy < ~/.ssh/id_rsa.pub**

Go to your Github account : https://github.com/settings/profile

1) Click : SSH and GPG keys

2) New SSH Key and Past it there

3) Add SSH Key

Done!

Handling Enter Key in Vue.js

For enter event handling you can use

@keyup.enter or
@keyup.13

13 is the keycode of enter. For @ key event, the keycode is 50. So you can use @keyup.50.

For example:

<input @keyup.50="atPress()" />

Android - save/restore fragment state

When a fragment is moved to the backstack, it isn't destroyed. All the instance variables remain there. So this is the place to save your data. In onActivityCreated you check the following conditions:

Is the bundle != null? If yes, that's where the data is saved (probably orientation change).
Is there data saved in instance variables? If yes, restore your state from them (or maybe do nothing, because everything is as it should be).
Otherwise your fragment is shown for the first time, create everything anew.

Edit: Here's an example

public class ExampleFragment extends Fragment {
    private List<String> myData;

    @Override
    public void onSaveInstanceState(final Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putSerializable("list", (Serializable) myData);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        if (savedInstanceState != null) {
            //probably orientation change
            myData = (List<String>) savedInstanceState.getSerializable("list");
        } else {
            if (myData != null) {
                //returning from backstack, data is fine, do nothing
            } else {
                //newly created, compute data
                myData = computeData();
            }
        }
    }
}

Telling Python to save a .txt file to a certain directory on Windows and Mac

Just use an absolute path when opening the filehandle for writing.

import os.path

save_path = 'C:/example/'

name_of_file = raw_input("What is the name of the file: ")

completeName = os.path.join(save_path, name_of_file+".txt")         

file1 = open(completeName, "w")

toFile = raw_input("Write what you want into the field")

file1.write(toFile)

file1.close()

You could optionally combine this with os.path.abspath() as described in Bryan's answer to automatically get the path of a user's Documents folder. Cheers!

Draw a connecting line between two elements

GoJS supports this, with its State Chart example, that supports dragging and dropping of elements, and editing of connections.

This answer is based off of Walter Northwoods' answer.

SQL Joins Vs SQL Subqueries (Performance)?

The two queries may not be semantically equivalent. If a employee works for more than one department (possible in the enterprise I work for; admittedly, this would imply your table is not fully normalized) then the first query would return duplicate rows whereas the second query would not. To make the queries equivalent in this case, the DISTINCT keyword would have to be added to the SELECT clause, which may have an impact on performance.

Note there is a design rule of thumb that states a table should model an entity/class or a relationship between entities/classes but not both. Therefore, I suggest you create a third table, say OrgChart, to model the relationship between employees and departments.

"Integer number too large" error message for 600851475143

You need 40 bits to represent the integer literal 600851475143. In Java, the maximum integer value is 2^31-1 however (i.e. integers are 32 bit, see http://download.oracle.com/javase/1.4.2/docs/api/java/lang/Integer.html).

This has nothing to do with function. Try using a long integer literal instead (as suggested in the other answers).

How to upgrade docker container after its image changed

Consider for this answers:

The database name is app_schema
The container name is app_db
The root password is root123

How to update MySQL when storing application data inside the container

This is considered a bad practice, because if you lose the container, you will lose the data. Although it is a bad practice, here is a possible way to do it:

1) Do a database dump as SQL:

docker exec app_db sh -c 'exec mysqldump app_schema -uroot -proot123' > database_dump.sql

2) Update the image:

docker pull mysql:5.6

3) Update the container:

docker rm -f app_db
docker run --name app_db --restart unless-stopped \
-e MYSQL_ROOT_PASSWORD=root123 \
-d mysql:5.6

4) Restore the database dump:

docker exec app_db sh -c 'exec mysql -uroot -proot123' < database_dump.sql

How to update MySQL container using an external volume

Using an external volume is a better way of managing data, and it makes easier to update MySQL. Loosing the container will not lose any data. You can use docker-compose to facilitate managing multi-container Docker applications in a single host:

1) Create the docker-compose.yml file in order to manage your applications:

version: '2'
services:
  app_db:
    image: mysql:5.6
    restart: unless-stopped
    volumes_from: app_db_data
  app_db_data:
    volumes: /my/data/dir:/var/lib/mysql

2) Update MySQL (from the same folder as the docker-compose.yml file):

docker-compose pull
docker-compose up -d

Note: the last command above will update the MySQL image, recreate and start the container with the new image.

Div height 100% and expands to fit content

Modern browsers support the "viewport height" unit. This will expand the div to the available viewport height. I find it more reliable than any other approach.

#some_div {
    height: 100vh;
    background: black;
}

Difference between VARCHAR2(10 CHAR) and NVARCHAR2(10)

The NVARCHAR2 datatype was introduced by Oracle for databases that want to use Unicode for some columns while keeping another character set for the rest of the database (which uses VARCHAR2). The NVARCHAR2 is a Unicode-only datatype.

One reason you may want to use NVARCHAR2 might be that your DB uses a non-Unicode character set and you still want to be able to store Unicode data for some columns without changing the primary character set. Another reason might be that you want to use two Unicode character set (AL32UTF8 for data that comes mostly from western Europe, AL16UTF16 for data that comes mostly from Asia for example) because different character sets won't store the same data equally efficiently.

Both columns in your example (Unicode VARCHAR2(10 CHAR) and NVARCHAR2(10)) would be able to store the same data, however the byte storage will be different. Some strings may be stored more efficiently in one or the other.

Note also that some features won't work with NVARCHAR2, see this SO question:

Oracle Text will not work with NVARCHAR2. What else might be unavailable?

Get url parameters from a string in .NET

Use static ParseQueryString method of System.Web.HttpUtility class that returns NameValueCollection.

Uri myUri = new Uri("http://www.example.com?param1=good&param2=bad");
string param1 = HttpUtility.ParseQueryString(myUri.Query).Get("param1");

Check documentation at http://msdn.microsoft.com/en-us/library/ms150046.aspx

Auto generate function documentation in Visual Studio

GhostDoc!

Right-click on the function, select "Document this" and

private bool FindTheFoo(int numberOfFoos)

becomes

/// <summary>
/// Finds the foo.
/// </summary>
/// <param name="numberOfFoos">The number of foos.</param>
/// <returns></returns>
private bool FindTheFoo(int numberOfFoos)

(yes, it is all autogenerated).

It has support for C#, VB.NET and C/C++. It is per default mapped to Ctrl+Shift+D.

Remember: you should add information beyond the method signature to the documentation. Don't just stop with the autogenerated documentation. The value of a tool like this is that it automatically generates the documentation that can be extracted from the method signature, so any information you add should be new information.

That being said, I personally prefer when methods are totally selfdocumenting, but sometimes you will have coding-standards that mandate outside documentation, and then a tool like this will save you a lot of braindead typing.

How do I execute a bash script in Terminal?

$prompt: /path/to/script and hit enter. Note you need to make sure the script has execute permissions.

How to make PDF file downloadable in HTML link?

I know I am very late to answer this but I found a hack to do this in javascript.

function downloadFile(src){
    var link=document.createElement('a');
    document.body.appendChild(link);
    link.href= src;
    link.download = '';
    link.click();
}

Questions every good Java/Java EE Developer should be able to answer?

What do you like most / least about Java and why?

jquery how to get the page's current screen top position?

var top = $('html').offset().top;

should do it.

edit: this is the negative of $(document).scrollTop()

ContractFilter mismatch at the EndpointDispatcher exception

For a Java client calling a .net endpoint. This was caused by mismatching Soap Action header.

Content-Type: application/soap+xml;charset=UTF-8;action="http://example.org/ExampleWS/exampleMethod"

The above HTTP header or following XML tag needs to match the action/method your are trying to invoke.

   <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:tem="http://tempuri.org/" xmlns:gen="http://schemas.datacontract.org/2004/07/GenesysOnline.WCFServices">
   <soap:Header xmlns:wsa="http://www.w3.org/2005/08/addressing">
      <wsa:To>https://example.org/v1/Service.svc</wsa:To>
      <wsa:Action>http://example.org/ExampleWS/exampleMethod</wsa:Action>
   </soap:Header>
   <soap:Body>
    ...
   </soap:Body>
</soap:Envelope>

Why call git branch --unset-upstream to fixup?

Issue: Your branch is based on 'origin/master', but the upstream is gone.

Solution: git branch --unset-upstream

How to get last key in an array?

As of PHP7.3 you can directly access the last key in (the outer level of) an array with array_key_last()

The definitively puts much of the debate on this page to bed. It is hands-down the best performer, suffers no side effects, and is a direct, intuitive, single-call technique to deliver exactly what this question seeks.

A rough benchmark as proof: https://3v4l.org/hO1Yf

array_slice() + key():  1.4
end() + key():         13.7
array_key_last():       0.00015
*test array contains 500000 elements, microtime repeated 100x then averaged then multiplied by 1000 to avoid scientific notation. Credit to @MAChitgarha for the initial benchmark commented under @TadejMagajna's answer.

This means you can retrieve the value of the final key without:

moving the array pointer (which requires two lines of code) or
sorting, reversing, popping, counting, indexing an array of keys, or any other tomfoolery

This function was long overdue and a welcome addition to the array function tool belt that improves performance, avoids unwanted side-effects, and enables clean/direct/intuitive code.

Here is a demo:

$array = ["a" => "one", "b" => "two", "c" => "three"];
if (!function_exists('array_key_last')) {
    echo "please upgrade to php7.3";
} else {
    echo "First Key: " , key($array) , "\n";
    echo "Last Key: " , array_key_last($array) , "\n";
    next($array);                 // move array pointer to second element
    echo "Second Key: " , key($array) , "\n";
    echo "Still Last Key: " , array_key_last($array);
}

Output:

First Key: a
Last Key: c     // <-- unaffected by the pointer position, NICE!
Second Key: b
Last Key: c     // <-- unaffected by the pointer position, NICE!

Some notes:

array_key_last() is the sibling function of array_key_first().
Both of these functions are "pointer-ignorant".
Both functions return null if the array is empty.
Discarded sibling functions (array_value_first() & array_value_last()) also would have offered the pointer-ignorant access to bookend elements, but they evidently failed to garner sufficient votes to come to life.

Here are some relevant pages discussing the new features:

p.s. If anyone is weighing up some of the other techniques, you may refer to this small collection of comparisons: (Demo)

Duration of array_slice() + key():     0.35353660583496
Duration of end() + key():             6.7495584487915
Duration of array_key_last():          0.00025749206542969
Duration of array_keys() + end():      7.6123380661011
Duration of array_reverse() + key():   6.7875385284424
Duration of array_slice() + foreach(): 0.28870105743408

How can I create an editable dropdownlist in HTML?

Simple HTML + Javascript approach without CSS

_x000D_

function editDropBox() {_x000D_
    var cSelect = document.getElementById('changingList');_x000D_
_x000D_
    var optionsSavehouse = [];_x000D_
    if(cSelect != null) {_x000D_
        var optionsArray = Array.from(cSelect.options);_x000D_
_x000D_
        var arrayLength = optionsArray.length;_x000D_
        for (var o = 0; o < arrayLength; o++) {_x000D_
            var option = optionsArray[o];_x000D_
            var oVal = option.value;_x000D_
_x000D_
            if(oVal > 0) {_x000D_
                var localParams = [];_x000D_
                localParams.push(option.text);_x000D_
                localParams.push(option.value);_x000D_
                //localParams.push(option.selected); // if needed_x000D_
                optionsSavehouse.push(localParams);_x000D_
            }_x000D_
        }_x000D_
    }_x000D_
_x000D_
    var hidden = ("<input id='hidden_select_options' type='hidden' value='" + JSON.stringify(optionsSavehouse) + "' />");_x000D_
_x000D_
    var cSpan = document.getElementById('changingSpan');_x000D_
    if(cSpan != null) {_x000D_
        cSpan.innerHTML = (hidden + "<input size='2' type='text' id='tempInput' name='fname' onchange='restoreDropBox()'>");_x000D_
    }_x000D_
}_x000D_
_x000D_
function restoreDropBox() {_x000D_
    var cSpan = document.getElementById('changingSpan');_x000D_
    var cInput = document.getElementById('tempInput');_x000D_
    var hOptions = document.getElementById('hidden_select_options');_x000D_
_x000D_
    if(cSpan != null) {_x000D_
_x000D_
        var optionsArray = [];_x000D_
_x000D_
        if(hOptions != null) {_x000D_
            optionsArray = JSON.parse(hOptions.value);_x000D_
        }_x000D_
_x000D_
        var selectList = "<select id='changingList'>\n";_x000D_
_x000D_
        var arrayLength = optionsArray.length;_x000D_
        for (var o = 0; o < arrayLength; o++) {_x000D_
            var option = optionsArray[o];_x000D_
            selectList += ("<option value='" + option[1] + "'>" + option[0] + "</option>\n");_x000D_
        }_x000D_
_x000D_
        if(cInput != null) {_x000D_
            selectList += ("<option value='-1' selected>" + cInput.value + "</option>\n");_x000D_
        }_x000D_
_x000D_
        selectList += ("<option value='-2' onclick='editDropBox()'>- Edit -</option>\n</select>");_x000D_
        cSpan.innerHTML = selectList;_x000D_
    }_x000D_
}

_x000D_

<span id="changingSpan">_x000D_
    <select id="changingList">_x000D_
        <option value="1">Apple</option>_x000D_
        <option value="2">Banana</option>_x000D_
        <option value="3">Cherry</option>_x000D_
        <option value="4">Dewberry</option>_x000D_
        <option onclick="editDropBox()" value="-2">- Edit -</option>_x000D_
    </select>_x000D_
</span>

_x000D_

How to center div vertically inside of absolutely positioned parent div

Center vertically and horizontally:

.parent{
  height: 100%;
  position: absolute;
  width: 100%;
  top: 0;
  left: 0;
}
.c{
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
}

Is key-value observation (KVO) available in Swift?

You can use KVO in Swift, but only for dynamic properties of NSObject subclass. Consider that you wanted to observe the bar property of a Foo class. In Swift 4, specify bar as dynamic property in your NSObject subclass:

class Foo: NSObject {
    @objc dynamic var bar = 0
}

You can then register to observe changes to the bar property. In Swift 4 and Swift 3.2, this has been greatly simplified, as outlined in Using Key-Value Observing in Swift:

class MyObject {
    private var token: NSKeyValueObservation

    var objectToObserve = Foo()

    init() {
        token = objectToObserve.observe(\.bar) { [weak self] object, change in  // the `[weak self]` is to avoid strong reference cycle; obviously, if you don't reference `self` in the closure, then `[weak self]` is not needed
            print("bar property is now \(object.bar)")
        }
    }
}

Note, in Swift 4, we now have strong typing of keypaths using the backslash character (the \.bar is the keypath for the bar property of the object being observed). Also, because it's using the completion closure pattern, we don't have to manually remove observers (when the token falls out of scope, the observer is removed for us) nor do we have to worry about calling the super implementation if the key doesn't match. The closure is called only when this particular observer is invoked. For more information, see WWDC 2017 video, What's New in Foundation.

In Swift 3, to observe this, it's a bit more complicated, but very similar to what one does in Objective-C. Namely, you would implement observeValue(forKeyPath keyPath:, of object:, change:, context:) which (a) makes sure we're dealing with our context (and not something that our super instance had registered to observe); and then (b) either handle it or pass it on to the super implementation, as necessary. And make sure to remove yourself as an observer when appropriate. For example, you might remove the observer when it is deallocated:

In Swift 3:

class MyObject: NSObject {
    private var observerContext = 0

    var objectToObserve = Foo()

    override init() {
        super.init()

        objectToObserve.addObserver(self, forKeyPath: #keyPath(Foo.bar), options: [.new, .old], context: &observerContext)
    }

    deinit {
        objectToObserve.removeObserver(self, forKeyPath: #keyPath(Foo.bar), context: &observerContext)
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        guard context == &observerContext else {
            super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
            return
        }

        // do something upon notification of the observed object

        print("\(keyPath): \(change?[.newKey])")
    }

}

Note, you can only observe properties that can be represented in Objective-C. Thus, you cannot observe generics, Swift struct types, Swift enum types, etc.

For a discussion of the Swift 2 implementation, see my original answer, below.

Using the dynamic keyword to achieve KVO with NSObject subclasses is described in the Key-Value Observing section of the Adopting Cocoa Design Conventions chapter of the Using Swift with Cocoa and Objective-C guide:

Key-value observing is a mechanism that allows objects to be notified of changes to specified properties of other objects. You can use key-value observing with a Swift class, as long as the class inherits from the NSObject class. You can use these three steps to implement key-value observing in Swift.
Add the dynamic modifier to any property you want to observe. For more information on dynamic, see Requiring Dynamic Dispatch.
class MyObjectToObserve: NSObject {
    dynamic var myDate = NSDate()
    func updateDate() {
        myDate = NSDate()
    }
}
Create a global context variable.
private var myContext = 0
Add an observer for the key-path, and override the observeValueForKeyPath:ofObject:change:context: method, and remove the observer in deinit.
class MyObserver: NSObject {
    var objectToObserve = MyObjectToObserve()
    override init() {
        super.init()
        objectToObserve.addObserver(self, forKeyPath: "myDate", options: .New, context: &myContext)
    }

    override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
        if context == &myContext {
            if let newValue = change?[NSKeyValueChangeNewKey] {
                print("Date changed: \(newValue)")
            }
        } else {
            super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)
        }
    }

    deinit {
        objectToObserve.removeObserver(self, forKeyPath: "myDate", context: &myContext)
    }
}

[Note, this KVO discussion has subsequently been removed from the Using Swift with Cocoa and Objective-C guide, which has been adapted for Swift 3, but it still works as outlined at the top of this answer.]

It's worth noting that Swift has its own native property observer system, but that's for a class specifying its own code that will be performed upon observation of its own properties. KVO, on the other hand, is designed to register to observe changes to some dynamic property of some other class.

cannot make a static reference to the non-static field

You are trying to access non static field directly from static method which is not legal in java. balance is a non static field, so either access it using object reference or make it static.

Editing specific line in text file in Python

You want to do something like this:

# with is like your try .. finally block in this case
with open('stats.txt', 'r') as file:
    # read a list of lines into data
    data = file.readlines()

print data
print "Your name: " + data[0]

# now change the 2nd line, note that you have to add a newline
data[1] = 'Mage\n'

# and write everything back
with open('stats.txt', 'w') as file:
    file.writelines( data )

The reason for this is that you can't do something like "change line 2" directly in a file. You can only overwrite (not delete) parts of a file - that means that the new content just covers the old content. So, if you wrote 'Mage' over line 2, the resulting line would be 'Mageior'.

How do I format a date in VBA with an abbreviated month?

I'm using

Sheet1.Range("E2", "E3000").NumberFormat = "dd/mm/yyyy hh:mm:ss"

to format a column

So I guess

Sheet1.Range("E2", "E3000").NumberFormat = "MMM dd yyyy"

would do the trick for you.

More: NumberFormat function.

What is the difference between Jupyter Notebook and JupyterLab?

This answer shows the python perspective. Jupyter supports various languages besides python.

Both Jupyter Notebook and Jupyterlab are browser compatible interactive python (i.e. python ".ipynb" files) environments, where you can divide the various portions of the code into various individually executable cells for the sake of better readability. Both of these are popular in Data Science/Scientific Computing domain.

I'd suggest you to go with Jupyterlab for the advantages over Jupyter notebooks:

In Jupyterlab, you can create ".py" files, ".ipynb" files, open terminal etc. Jupyter Notebook allows ".ipynb" files while providing you the choice to choose "python 2" or "python 3".
Jupyterlab can open multiple ".ipynb" files inside a single browser tab. Whereas, Jupyter Notebook will create new tab to open new ".ipynb" files every time. Hovering between various tabs of browser is tedious, thus Jupyterlab is more helpful here.

I'd recommend using PIP to install Jupyterlab.

If you can't open a ".ipynb" file using Jupyterlab on Windows system, here are the steps:

Go to the file --> Right click --> Open With --> Choose another app --> More Apps --> Look for another apps on this PC --> Click.
This will open a file explorer window. Now go inside your Python installation folder. You should see Scripts folder. Go inside it.
Once you find jupyter-lab.exe, select that and now it will open the .ipynb files by default on your PC.

How do you specify a byte literal in Java?

You have to cast, I'm afraid:

f((byte)0);

I believe that will perform the appropriate conversion at compile-time instead of execution time, so it's not actually going to cause performance penalties. It's just inconvenient :(

How can I make a list of installed packages in a certain virtualenv?

Calling pip command inside a virtualenv should list the packages visible/available in the isolated environment. Make sure to use a recent version of virtualenv that uses option --no-site-packages by default. This way the purpose of using virtualenv is to create a python environment without access to packages installed in system python.

Next, make sure you use pip command provided inside the virtualenv (YOUR_ENV/bin/pip). Or just activate the virtualenv (source YOUR_ENV/bin/activate) as a convenient way to call the proper commands for python interpreter or pip

~/Projects$ virtualenv --version
1.9.1

~/Projects$ virtualenv -p /usr/bin/python2.7 demoenv2.7
Running virtualenv with interpreter /usr/bin/python2.7
New python executable in demoenv2.7/bin/python2.7
Also creating executable in demoenv2.7/bin/python
Installing setuptools............................done.
Installing pip...............done.

~/Projects$ cd demoenv2.7/
~/Projects/demoenv2.7$ bin/pip freeze
wsgiref==0.1.2

~/Projects/demoenv2.7$ bin/pip install commandlineapp
Downloading/unpacking commandlineapp
Downloading CommandLineApp-3.0.7.tar.gz (142kB): 142kB downloaded
Running setup.py egg_info for package commandlineapp
Installing collected packages: commandlineapp
Running setup.py install for commandlineapp
Successfully installed commandlineapp
Cleaning up...

~/Projects/demoenv2.7$ bin/pip freeze
CommandLineApp==3.0.7
wsgiref==0.1.2

What's strange in my answer is that package 'wsgiref' is visible inside the virtualenv. Its from my system python. Currently I do not know why, but maybe it is different on your system.

docker-compose up for only certain containers

You can use the run command and specify your services to run. Be careful, the run command does not expose ports to the host. You should use the flag --service-ports to do that if needed.

docker-compose run --service-ports client server database

How to keep the header static, always on top while scrolling?

Instead of working with positioning and padding/margin and without knowing the header's size, there's a way to keep the header fixed by playing with the scroll.

See the this plunker with a fixed header:

<html lang="en" style="height: 100%">
<body style="height: 100%">
<div style="height: 100%; overflow: hidden">
  <div>Header</div>
  <div style="height: 100%; overflow: scroll">Content - very long Content...

The key here is a mix of height: 100% with overflow.

See a specific question on removing the scroll from the header here and answer here.

How to set minDate to current date in jQuery UI Datepicker?

You can use the minDate property, like this:

$("input.DateFrom").datepicker({
    changeMonth: true, 
    changeYear: true, 
    dateFormat: 'yy-mm-dd',
    minDate: 0, // 0 days offset = today
    maxDate: 'today',
    onSelect: function(dateText) {
        $sD = new Date(dateText);
        $("input#DateTo").datepicker('option', 'minDate', min);
    }
});

You can also specify a date, like this:

minDate: new Date(), // = today

How to extract a value from a string using regex and a shell?

It seems that you are asking multiple things. To answer them:

Yes, it is ok to extract data from a string using regular expressions, that's what they're there for
You get errors, which one and what shell tool do you use?
You can extract the numbers by catching them in capturing parentheses:
```
.*(\d+) rofl.*
```
and using $1 to get the string out (.* is for "the rest before and after on the same line)

With sed as example, the idea becomes this to replace all strings in a file with only the matching number:

sed -e 's/.*(\d+) rofl.*/$1/g' inputFileName > outputFileName

or:

echo "12 BBQ ,45 rofl, 89 lol" | sed -e 's/.*(\d+) rofl.*/$1/g'

Save Dataframe to csv directly to s3 Python

I found a very simple solution that seems to be working :

s3 = boto3.client("s3")

s3.put_object(
    Body=open("filename.csv").read(),
    Bucket="your-bucket",
    Key="your-key"
)

Hope that helps !

Twitter bootstrap modal-backdrop doesn't disappear

In ASP.NET, add an update for UpdatePanel on code behind after the jquery command. Example:

    ScriptManager.RegisterStartupScript(Page, Page.GetType(), "myModal", "$('#myModal').modal('hide');", true);
    upModal.Update();

Sending JSON object to Web API

Change:

 data: JSON.stringify({ model: source })

To:

 data: {model: JSON.stringify(source)}

And in your controller you do this:

public void PartSourceAPI(string model)
{
       System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();

   var result = js.Deserialize<PartSourceModel>(model);
}

If the url you use in jquery is /api/PartSourceAPI then the controller name must be api and the action(method) should be PartSourceAPI

UnicodeDecodeError: 'utf8' codec can't decode byte 0xa5 in position 0: invalid start byte

The error is because there is some non-ascii character in the dictionary and it can't be encoded/decoded. One simple way to avoid this error is to encode such strings with encode() function as follows (if a is the string with non-ascii character):

a.encode('utf-8').strip()

What does the question mark and the colon (?: ternary operator) mean in objective-c?

It's just a short form of writing an if-then-else statement. It means the same as the following code:

if(inPseudoEditMode)
  label.frame = kLabelIndentedRect;
else
  label.frame = kLabelRect;

how to align img inside the div to the right?

vertical-align:middle; text-align:right;

Which loop is faster, while or for?

As for infinite loops for(;;) loop is better than while(1) since while evaluates every time the condition but again it depends on the compiler.

How to show another window from mainwindow in QT

Implement a slot in your QMainWindow where you will open your new Window,
Place a widget on your QMainWindow,
Connect a signal from this widget to a slot from the QMainWindow (for example: if the widget is a QPushButton connect the signal click() to the QMainWindow custom slot you have created).

Code example:

MainWindow.h

// ...
include "newwindow.h"
// ...
public slots:
   void openNewWindow();
// ...
private:
   NewWindow *mMyNewWindow;
// ...
}

MainWindow.cpp

// ...
   MainWindow::MainWindow()
   {
      // ...
      connect(mMyButton, SIGNAL(click()), this, SLOT(openNewWindow()));
      // ...
   }
// ...
void MainWindow::openNewWindow()
{
   mMyNewWindow = new NewWindow(); // Be sure to destroy your window somewhere
   mMyNewWindow->show();
   // ...
}

This is an example on how display a custom new window. There are a lot of ways to do this.

Check synchronously if file/directory exists in Node.js

fs.exists() is deprecated dont use it https://nodejs.org/api/fs.html#fs_fs_exists_path_callback

You could implement the core nodejs way used at this: https://github.com/nodejs/node-v0.x-archive/blob/master/lib/module.js#L86

function statPath(path) {
  try {
    return fs.statSync(path);
  } catch (ex) {}
  return false;
}

this will return the stats object then once you've got the stats object you could try

var exist = statPath('/path/to/your/file.js');
if(exist && exist.isFile()) {
  // do something
}

How can I conditionally require form inputs with AngularJS?

For Angular 2

<input [(ngModel)]='email' [required]='!phone' />
<input [(ngModel)]='phone' [required]='!email' />

Invalid postback or callback argument. Event validation is enabled using '<pages enableEventValidation="true"/>'

When I added the id on ItemDataBound then it did not give me the error, but it was not giving me the command name. It was returning command name empty. Then I added command name as well while ItemDataBound. Then it resolved the same problem. Thanks Nilesh, great suggestion. It Worked :)

Radio Buttons ng-checked with ng-model

Please explain why same ng-model is used? And what value is passed through ng- model and how it is passed? To be more specific, if I use console.log(color) what would be the output?

How to get parameter on Angular2 route in Angular way?

Update: Sep 2019

As a few people have mentioned, the parameters in paramMap should be accessed using the common MapAPI:

To get a snapshot of the params, when you don't care that they may change:

this.bankName = this.route.snapshot.paramMap.get('bank');

To subscribe and be alerted to changes in the parameter values (typically as a result of the router's navigation)

this.route.paramMap.subscribe( paramMap => {
    this.bankName = paramMap.get('bank');
})

Update: Aug 2017

Since Angular 4, params have been deprecated in favor of the new interface paramMap. The code for the problem above should work if you simply substitute one for the other.

Original Answer

If you inject ActivatedRoute in your component, you'll be able to extract the route parameters

    import {ActivatedRoute} from '@angular/router';
    ...
    
    constructor(private route:ActivatedRoute){}
    bankName:string;
    
    ngOnInit(){
        // 'bank' is the name of the route parameter
        this.bankName = this.route.snapshot.params['bank'];
    }

If you expect users to navigate from bank to bank directly, without navigating to another component first, you ought to access the parameter through an observable:

    ngOnInit(){
        this.route.params.subscribe( params =>
            this.bankName = params['bank'];
        )
    }

For the docs, including the differences between the two check out this link and search for "activatedroute"

Cloud Firestore collection count

As with many questions, the answer is - It depends.

You should be very careful when handling large amounts of data on the front end. On top of making your front end feel sluggish, Firestore also charges you $0.60 per million reads you make.

Small collection (less than 100 documents)

Use with care - Frontend user experience may take a hit

Handling this on the front end should be fine as long as you are not doing too much logic with this returned array.

db.collection('...').get().then(snap => {
   size = snap.size // will return the collection size
});

Medium collection (100 to 1000 documents)

Use with care - Firestore read invocations may cost a lot

Handling this on the front end is not feasible as it has too much potential to slow down the users system. We should handle this logic server side and only return the size.

The drawback to this method is you are still invoking firestore reads (equal to the size of your collection), which in the long run may end up costing you more than expected.

Cloud Function:

...
db.collection('...').get().then(snap => {
    res.status(200).send({length: snap.size});
});

Front End:

yourHttpClient.post(yourCloudFunctionUrl).toPromise().then(snap => {
     size = snap.length // will return the collection size
})

Large collection (1000+ documents)

Most scalable solution

FieldValue.increment()

As of April 2019 Firestore now allows incrementing counters, completely atomically, and without reading the data prior. This ensures we have correct counter values even when updating from multiple sources simultaneously (previously solved using transactions), while also reducing the number of database reads we perform.

By listening to any document deletes or creates we can add to or remove from a count field that is sitting in the database.

See the firestore docs - Distributed Counters Or have a look at Data Aggregation by Jeff Delaney. His guides are truly fantastic for anyone using AngularFire but his lessons should carry over to other frameworks as well.

Cloud Function:

export const documentWriteListener = 
    functions.firestore.document('collection/{documentUid}')
    .onWrite((change, context) => {

    if (!change.before.exists) {
        // New document Created : add one to count

        db.doc(docRef).update({numberOfDocs: FieldValue.increment(1)});
    
    } else if (change.before.exists && change.after.exists) {
        // Updating existing document : Do nothing

    } else if (!change.after.exists) {
        // Deleting document : subtract one from count

        db.doc(docRef).update({numberOfDocs: FieldValue.increment(-1)});

    }

return;
});

Now on the frontend you can just query this numberOfDocs field to get the size of the collection.

"Large data" workflows using pandas

At the moment I am working "like" you, just on a lower scale, which is why I don't have a PoC for my suggestion.

However, I seem to find success in using pickle as caching system and outsourcing execution of various functions into files - executing these files from my commando / main file; For example i use a prepare_use.py to convert object types, split a data set into test, validating and prediction data set.

How does your caching with pickle work? I use strings in order to access pickle-files that are dynamically created, depending on which parameters and data sets were passed (with that i try to capture and determine if the program was already run, using .shape for data set, dict for passed parameters). Respecting these measures, i get a String to try to find and read a .pickle-file and can, if found, skip processing time in order to jump to the execution i am working on right now.

Using databases I encountered similar problems, which is why i found joy in using this solution, however - there are many constraints for sure - for example storing huge pickle sets due to redundancy. Updating a table from before to after a transformation can be done with proper indexing - validating information opens up a whole other book (I tried consolidating crawled rent data and stopped using a database after 2 hours basically - as I would have liked to jump back after every transformation process)

I hope my 2 cents help you in some way.

Greetings.

What is the best way to get the first letter from a string in Java, returned as a string of length 1?

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

import java.util.concurrent.TimeUnit;

@State(Scope.Thread)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 1)
@Fork(value = 1)
@Measurement(iterations = 5, time = 1)
public class StringFirstCharBenchmark {

    private String source;

    @Setup
    public void init() {
        source = "MALE";
    }

    @Benchmark
    public String substring() {
        return source.substring(0, 1);
    }

    @Benchmark
    public String indexOf() {
        return String.valueOf(source.indexOf(0));
    }
}

Results:

+----------------------------------------------------------------------+
| Benchmark                           Mode  Cnt   Score   Error  Units |
+----------------------------------------------------------------------+
| StringFirstCharBenchmark.indexOf    avgt    5  23.777 ? 5.788  ns/op |
| StringFirstCharBenchmark.substring  avgt    5  11.305 ? 1.411  ns/op |
+----------------------------------------------------------------------+

Laravel stylesheets and javascript don't load for non-base routes

Vinsa almost had it right you should add

<base href="{{URL::asset('/')}}" target="_top">

and scripts should go in their regular path

<script src="js/jquery/jquery-1.11.1.min.js"></script>

the reason for this is because Images and other things with relative path like image source or ajax requests won't work correctly without the base path attached.

ViewBag, ViewData and TempData

Also the scope is different between viewbag and temptdata. viewbag is based on first view (not shared between action methods) but temptdata can be shared between an action method and just one another.

How to check if DST (Daylight Saving Time) is in effect, and if so, the offset?

Create two dates: one in June, one in January. Compare their getTimezoneOffset() values.

if January offset > June offset, client is in northern hemisphere
if January offset < June offset, client is in southern hemisphere
if no difference, client timezone does not observe DST

Now check getTimezoneOffset() of the current date.

if equal to June, northern hemisphere, then current time zone is DST (+1 hour)
if equal to January, southern hemisphere, then current time zone is DST (+1 hour)

ASP.Net MVC: Calling a method from a view

You can implement a static formatting method or an HTML helper, then use this syntaxe :

@using class_of_method_namespace
...
// HTML page here
@className.MethodName()

or in case of HTML Helper

@Html.MehtodName()

How to find duplicate records in PostgreSQL

You can join to the same table on the fields that would be duplicated and then anti-join on the id field. Select the id field from the first table alias (tn1) and then use the array_agg function on the id field of the second table alias. Finally, for the array_agg function to work properly, you will group the results by the tn1.id field. This will produce a result set that contains the the id of a record and an array of all the id's that fit the join conditions.

select tn1.id,
       array_agg(tn2.id) as duplicate_entries, 
from table_name tn1 join table_name tn2 on 
    tn1.year = tn2.year 
    and tn1.sid = tn2.sid 
    and tn1.user_id = tn2.user_id 
    and tn1.cid = tn2.cid
    and tn1.id <> tn2.id
group by tn1.id;

Obviously, id's that will be in the duplicate_entries array for one id, will also have their own entries in the result set. You will have to use this result set to decide which id you want to become the source of 'truth.' The one record that shouldn't get deleted. Maybe you could do something like this:

with dupe_set as (
select tn1.id,
       array_agg(tn2.id) as duplicate_entries, 
from table_name tn1 join table_name tn2 on 
    tn1.year = tn2.year 
    and tn1.sid = tn2.sid 
    and tn1.user_id = tn2.user_id 
    and tn1.cid = tn2.cid
    and tn1.id <> tn2.id
group by tn1.id
order by tn1.id asc)
select ds.id from dupe_set ds where not exists 
 (select de from unnest(ds.duplicate_entries) as de where de < ds.id)

Selects the lowest number ID's that have duplicates (assuming the ID is increasing int PK). These would be the ID's that you would keep around.

Does this app use the Advertising Identifier (IDFA)? - AdMob 6.8.0

You can track all calls to [ASIdentifierManager advertisingIdentifier] with symbolic breakpoint in Xcode:

How to get current local date and time in Kotlin

Try this:

val date = Calendar.getInstance().time
val formatter = SimpleDateFormat.getDateTimeInstance() //or use getDateInstance()
val formatedDate = formatter.format(date)

You can use your own pattern as well, e.g.

val sdf = SimpleDateFormat("yyyy.MM.dd")
// 2020.02.02

To get local formatting use getDateInstance(), getDateTimeInstance(), or getTimeInstance(), or use new SimpleDateFormat(String template, Locale locale) with for example Locale.US for ASCII dates. The first three options require API level 29.

How to quietly remove a directory with content in PowerShell

in short, We can use rm -r -fo {folderName} to remove the folder recursively (remove all the files and folders inside) and force

How to use Select2 with JSON via Ajax request?

My ajax never gets fired until I wrapped the whole thing in

setTimeout(function(){ .... }, 3000);

I was using it in mounted section of Vue. it needs more time.

Check whether specific radio button is checked

I think you're using the wrong approach. You should set the value attribute of your input elements. Check the docs for .val() for examples of setting and returning the .val() of input elements.

ie.

<input type="radio" runat="server" name="testGroup" value="test2" />

return $('input:radio[name=testGroup]:checked').val() == 'test2';

Xcode 6 Storyboard the wrong size?

I had this issue in xcode 6 and there is a way to resolve the resize conflicts. If you select your view, at the bottom you will see an icon that looks like |-Δ-|. If you click on it, you're project will resize for different devices.

Figuring out whether a number is a Double in Java

Try this:

if (items.elementAt(1) instanceof Double) {
   sum.add( i, items.elementAt(1));
}

LINQ to Entities how to update a record

//for update

(from x in dataBase.Customers
         where x.Name == "Test"
         select x).ToList().ForEach(xx => xx.Name="New Name");

//for delete

dataBase.Customers.RemoveAll(x=>x.Name=="Name");

tkinter: how to use after method

I believe, the 500ms run in the background, while the rest of the code continues to execute and empties the list.

Then after 500ms nothing happens, as no function-call is implemented in the after-callup (same as frame.after(500, function=None))

When should I use GET or POST method? What's the difference between them?

The GET method:

It is used only for sending 256 character date
When using this method, the information can be seen on the browser
It is the default method used by forms
It is not so secured.

The POST method:

It is used for sending unlimited data.
With this method, the information cannot be seen on the browser
You can explicitly mention the POST method
It is more secured than the GET method
It provides more advanced features

How to Enable ActiveX in Chrome?

http://wiki.answers.com/Q/Does_Google_Chrome_support_ActiveX

Google Chrome comes with an ActiveX shim, as part of its default plugin array. So Google Chrome features at least partial support for ActiveX controls (as do many non-Internet Explorer browsers). I can't find information as to whether or not this includes support for ActiveX security certificates or the like, nor if/where such plugins can be controlled, within the browser.

..... Note that to enable the plug-in you must run Chrome with the following switch " --allow-all-activex" So in shortcut that is used to start up Chrome, add this after "Chrome.exe"

How to Solve the XAMPP 1.7.7 - PHPMyAdmin - MySQL Error #2002 in Ubuntu

Go to phpMyAdmin/config.inc.php edit the line

$cfg['Servers'][$i]['password'] = '';

$cfg['Servers'][$i]['password'] = 'yourpassword';

This problem might occur due to setting of a password to root, thus phpmyadmin is not able to connect to the mysql database.

And the last thing change

$cfg['Servers'][$i]['extension'] = 'mysql';

$cfg['Servers'][$i]['extension'] = 'mysqli';

Now restart your server. and see.

New warnings in iOS 9: "all bitcode will be dropped"

Your library was compiled without bitcode, but the bitcode option is enabled in your project settings. Say NO to Enable Bitcode in your target Build Settings and the Library Build Settings to remove the warnings.

For those wondering if enabling bitcode is required:

For iOS apps, bitcode is the default, but optional. For watchOS and tvOS apps, bitcode is required. If you provide bitcode, all apps and frameworks in the app bundle (all targets in the project) need to include bitcode.

https://help.apple.com/xcode/mac/current/#/devbbdc5ce4f

How to recognize swipe in all 4 directions

In Swift 4.2 and Xcode 9.4.1

Add Animation delegate, CAAnimationDelegate to your class

//Swipe gesture for left and right
let swipeFromRight = UISwipeGestureRecognizer(target: self, action: #selector(didSwipeLeft))
swipeFromRight.direction = UISwipeGestureRecognizerDirection.left
menuTransparentView.addGestureRecognizer(swipeFromRight)

let swipeFromLeft = UISwipeGestureRecognizer(target: self, action: #selector(didSwipeRight))
swipeFromLeft.direction = UISwipeGestureRecognizerDirection.right
menuTransparentView.addGestureRecognizer(swipeFromLeft)

//Swipe gesture selector function
@objc func didSwipeLeft(gesture: UIGestureRecognizer) {
    //We can add some animation also
    DispatchQueue.main.async(execute: {
            let animation = CATransition()
            animation.type = kCATransitionReveal
            animation.subtype = kCATransitionFromRight
            animation.duration = 0.5
            animation.delegate = self
            animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
            //Add this animation to your view
            self.transparentView.layer.add(animation, forKey: nil)
            self.transparentView.removeFromSuperview()//Remove or hide your view if requirement.
        })
}

//Swipe gesture selector function
@objc func didSwipeRight(gesture: UIGestureRecognizer) {
        // Add animation here
        DispatchQueue.main.async(execute: {
            let animation = CATransition()
            animation.type = kCATransitionReveal
            animation.subtype = kCATransitionFromLeft
            animation.duration = 0.5
            animation.delegate = self
            animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
            //Add this animation to your view
            self.transparentView.layer.add(animation, forKey: nil)
            self.transparentView.removeFromSuperview()//Remove or hide yourview if requirement.
        })
}

If you want to remove gesture from view use this code

self.transparentView.removeGestureRecognizer(gesture)

Ex:

func willMoveFromView(view: UIView) {
    if view.gestureRecognizers != nil {
        for gesture in view.gestureRecognizers! {
            //view.removeGestureRecognizer(gesture)//This will remove all gestures including tap etc...
            if let recognizer = gesture as? UISwipeGestureRecognizer {
                //view.removeGestureRecognizer(recognizer)//This will remove all swipe gestures
                if recognizer.direction == .left {//Especially for left swipe
                    view.removeGestureRecognizer(recognizer)
                }
            }
        }
    }
}

Call this function like

//Remove swipe gesture
self.willMoveFromView(view: self.transparentView)

Like this you can write remaining directions and please careful whether if you have scroll view or not from bottom to top and vice versa

If you have scroll view, you will get conflict for Top to bottom and view versa gestures.

Android device chooser - My device seems offline

I fixed it by deleting unwanted applications/games from my device--make sure there is more than 15mb free space on the device.). It will work :)

Restoring database from .mdf and .ldf files of SQL Server 2008

From a script (one that works):

CREATE DATABASE Northwind
ON ( FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS\MSSQL\DATA\Northwind.mdf' )
LOG ON ( FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS\MSSQL\DATA\Northwind_log.ldf')
GO

obviously update the path:

C:\Program Files\Microsoft SQL Server\MSSQL11.SQLEXPRESS\MSSQL\DATA

To where your .mdf and .ldf reside.

Solution for "Fatal error: Maximum function nesting level of '100' reached, aborting!" in PHP

I had this issue with WordPress on cloud9. It turns out it was the W3 Caching plugin. I disabled the plugin and it worked fine.

Excel VBA: Copying multiple sheets into new workbook

This worked for me (I added an "if sheet visible" because in my case I wanted to skip hidden sheets)

   Sub Create_new_file()

Application.DisplayAlerts = False

Dim wb As Workbook
Dim wbNew As Workbook
Dim sh As Worksheet
Dim shNew As Worksheet
Dim pname, parea As String


Set wb = ThisWorkbook
Workbooks.Add
Set wbNew = ActiveWorkbook

For Each sh In wb.Worksheets

    pname = sh.Name


    If sh.Visible = True Then

    sh.Copy After:=wbNew.Sheets(Sheets.Count)

    wbNew.Sheets(Sheets.Count).Cells.ClearContents
    wbNew.Sheets(Sheets.Count).Cells.ClearFormats
    wb.Sheets(sh.Name).Activate
    Range(sh.PageSetup.PrintArea).Select
    Selection.Copy

    wbNew.Sheets(pname).Activate
    Range("A1").Select

    With Selection

        .PasteSpecial (xlValues)
        .PasteSpecial (xlFormats)
        .PasteSpecial (xlPasteColumnWidths)

    End With

    ActiveSheet.Name = pname

    End If


Next

wbNew.Sheets("Hoja1").Delete

Application.DisplayAlerts = True

End Sub

How can I INSERT data into two tables simultaneously in SQL Server?

Try this:

insert into [table] ([data])
output inserted.id, inserted.data into table2
select [data] from [external_table]

UPDATE: Re:

Denis - this seems very close to what I want to do, but perhaps you could fix the following SQL statement for me? Basically the [data] in [table1] and the [data] in [table2] represent two different/distinct columns from [external_table]. The statement you posted above only works when you want the [data] columns to be the same.

INSERT INTO [table1] ([data]) 
OUTPUT [inserted].[id], [external_table].[col2] 
INTO [table2] SELECT [col1] 
FROM [external_table]

It's impossible to output external columns in an insert statement, so I think you could do something like this

merge into [table1] as t
using [external_table] as s
on 1=0 --modify this predicate as necessary
when not matched then insert (data)
values (s.[col1])
output inserted.id, s.[col2] into [table2]
;

How to run python script on terminal (ubuntu)?

Save your python file in a spot where you will be able to find it again. Then navigate to that spot using the command line (cd /home/[profile]/spot/you/saved/file) or go to that location with the file browser. If you use the latter, right click and select "Open In Terminal." When the terminal opens, type "sudo chmod +x Yourfilename." After entering your password, type "python ./Yourfilename" which will open your python file in the command line. Hope this helps!

Running Linux Mint

C++ equivalent of java's instanceof

Try using:

if(NewType* v = dynamic_cast<NewType*>(old)) {
   // old was safely casted to NewType
   v->doSomething();
}

This requires your compiler to have rtti support enabled.

EDIT: I've had some good comments on this answer!

Every time you need to use a dynamic_cast (or instanceof) you'd better ask yourself whether it's a necessary thing. It's generally a sign of poor design.

Typical workarounds is putting the special behaviour for the class you are checking for into a virtual function on the base class or perhaps introducing something like a visitor where you can introduce specific behaviour for subclasses without changing the interface (except for adding the visitor acceptance interface of course).

As pointed out dynamic_cast doesn't come for free. A simple and consistently performing hack that handles most (but not all cases) is basically adding an enum representing all the possible types your class can have and check whether you got the right one.

if(old->getType() == BOX) {
   Box* box = static_cast<Box*>(old);
   // Do something box specific
}

This is not good oo design, but it can be a workaround and its cost is more or less only a virtual function call. It also works regardless of RTTI is enabled or not.

Note that this approach doesn't support multiple levels of inheritance so if you're not careful you might end with code looking like this:

// Here we have a SpecialBox class that inherits Box, since it has its own type
// we must check for both BOX or SPECIAL_BOX
if(old->getType() == BOX || old->getType() == SPECIAL_BOX) {
   Box* box = static_cast<Box*>(old);
   // Do something box specific
}

Angular - POST uploaded file

In my project , I use the XMLHttpRequest to send multipart/form-data. I think it will fit you to.

and the uploader code

let xhr = new XMLHttpRequest();
xhr.open('POST', 'http://www.example.com/rest/api', true);
xhr.withCredentials = true;
xhr.send(formData);

Here is example : https://github.com/wangzilong/angular2-multipartForm

C# cannot convert method to non delegate type

To execute a method you need to add parentheses, even if the method does not take arguments.

So it should be:

string t = obj.getTitle();

MS Excel showing the formula in a cell instead of the resulting value

If you are using VBA to enter formulas, it is possible to accidentally enter them incompletely:

Sub AlmostAFormula()
    With Range("A1")
        .Clear
        .NumberFormat = "@"
        .Value = "=B1+C1"
        .NumberFormat = "General"
    End With
End Sub

A1 will appear to have a formula, but it is only text until you double-click the cell and touch Enter .

Make sure you have no bugs like this in your code.

Find duplicate values in R

Here, I summarize a few ways which may return different results to your question, so be careful:

# First assign your "id"s to an R object.
# Here's a hypothetical example:
id <- c("a","b","b","c","c","c","d","d","d","d")

#To return ALL MINUS ONE duplicated values:
id[duplicated(id)]
## [1] "b" "c" "c" "d" "d" "d"

#To return ALL duplicated values by specifying fromLast argument:
id[duplicated(id) | duplicated(id, fromLast=TRUE)]
## [1] "b" "b" "c" "c" "c" "d" "d" "d" "d"

#Yet another way to return ALL duplicated values, using %in% operator:
id[ id %in% id[duplicated(id)] ]
## [1] "b" "b" "c" "c" "c" "d" "d" "d" "d"

Hope these help. Good luck.

S3 Static Website Hosting Route All Paths to Index.html

The easiest solution to make Angular 2+ application served from Amazon S3 and direct URLs working is to specify index.html both as Index and Error documents in S3 bucket configuration.

No value accessor for form control with name: 'recipient'

Make sure you import MaterialModule as well since you are using md-input which does not belong to FormsModule

Get table column names in MySQL?

I made a PDO function which returns all the column names in an simple array.

public function getColumnNames($table){
    $sql = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = :table";
    try {
        $core = Core::getInstance();
        $stmt = $core->dbh->prepare($sql);
        $stmt->bindValue(':table', $table, PDO::PARAM_STR);
        $stmt->execute();
        $output = array();
        while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
            $output[] = $row['COLUMN_NAME'];                
        }
        return $output; 
    }

    catch(PDOException $pe) {
        trigger_error('Could not connect to MySQL database. ' . $pe->getMessage() , E_USER_ERROR);
    }
}

The output will be an array:

Array (
[0] => id
[1] => name
[2] => email
[3] => shoe_size
[4] => likes
... )

Sorry for the necro but I like my function ;)

P.S. I have not included the class Core but you can use your own class.. D.S.

How to make graphics with transparent background in R using ggplot2?

Just to improve YCR's answer:

1) I added black lines on x and y axis. Otherwise they are made transparent too.

2) I added a transparent theme to the legend key. Otherwise, you will get a fill there, which won't be very esthetic.

Finally, note that all those work only with pdf and png formats. jpeg fails to produce transparent graphs.

MyTheme_transparent <- theme(
    panel.background = element_rect(fill = "transparent"), # bg of the panel
    plot.background = element_rect(fill = "transparent", color = NA), # bg of the plot
    panel.grid.major = element_blank(), # get rid of major grid
    panel.grid.minor = element_blank(), # get rid of minor grid
    legend.background = element_rect(fill = "transparent"), # get rid of legend bg
    legend.box.background = element_rect(fill = "transparent"), # get rid of legend panel bg
    legend.key = element_rect(fill = "transparent", colour = NA), # get rid of key legend fill, and of the surrounding
    axis.line = element_line(colour = "black") # adding a black line for x and y axis
)

align textbox and text/labels in html?

You have two boxes, left and right, for each label/input pair. Both boxes are in one row and have fixed width. Now, you just have to make label text float to the right with text-align: right;

Here's a simple example:

http://jsfiddle.net/qP46X/

Why do I get a SyntaxError for a Unicode escape in my file path?

This usually happens in Python 3. One of the common reasons would be that while specifying your file path you need "\\" instead of "\". As in:

filePath = "C:\\User\\Desktop\\myFile"

For Python 2, just using "\" would work.

Regular expression to extract text between square brackets

I needed including newlines and including the brackets

\[[\s\S]+\]

PHP check file extension

For php 5.3+ you can use the SplFileInfo() class

$spl = new SplFileInfo($filename); 
print_r($spl->getExtension()); //gives extension

Also since you are checking extension for file uploads, I highly recommend using the mime type instead..

For php 5.3+ use the finfo class

$finfo = new finfo(FILEINFO_MIME);
print_r($finfo->buffer(file_get_contents($file name));

Import Excel spreadsheet columns into SQL Server database

First of all, try the 32 Bit Version of the Import Wizard. This shows a lot more supported import formats.

Background: All depends on your Office (Runtimes Engines) installation.

If you dont't have Office 2007 or greater installed, the Import Wizard (32 Bit) only allows you to import Excel 97-2003 (.xls) files.

If you have the Office 2010 and geater (comes also in 64 Bit, not recommended) installed, the Import Wizard also supports Excel 2007+ (.xlsx) files.

To get an overview on the runtimes see 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine

How to add (vertical) divider to a horizontal LinearLayout?

Update: pre-Honeycomb using AppCompat

If you are using the AppCompat library v7 you may want to use the LinearLayoutCompat view. Using this approach you can use drawable dividers on Android 2.1, 2.2 and 2.3.

Example code:

<android.support.v7.widget.LinearLayoutCompat
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:showDividers="middle"
        app:divider="@drawable/divider">

drawable/divider.xml: (divider with some padding on the top and bottom)

<?xml version="1.0" encoding="UTF-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
        android:insetBottom="2dp"
        android:insetTop="2dp">
    <shape>
        <size android:width="1dp" />
        <solid android:color="#FFCCCCCC" />
    </shape>
</inset>

Very important note: The LinearLayoutCompat view does not extend LinearLayout and therefor you should not use the android:showDividers or android:divider properties but the custom ones: app:showDividers and app:divider. In code you should also use the LinearLayoutCompat.LayoutParams not the LinearLayout.LayoutParams!

How to initialize an array in Java?

Syntax

 Datatype[] variable = new Datatype[] { value1,value2.... }

 Datatype variable[]  = new Datatype[] { value1,value2.... }

Example :

int [] points = new int[]{ 1,2,3,4 };

Understanding get and set and Python descriptors

I tried (with minor changes as suggested) the code from Andrew Cooke's answer. (I am running python 2.7).

The code:

#!/usr/bin/env python
class Celsius:
    def __get__(self, instance, owner): return 9 * (instance.fahrenheit + 32) / 5.0
    def __set__(self, instance, value): instance.fahrenheit = 32 + 5 * value / 9.0

class Temperature:
    def __init__(self, initial_f): self.fahrenheit = initial_f
    celsius = Celsius()

if __name__ == "__main__":

    t = Temperature(212)
    print(t.celsius)
    t.celsius = 0
    print(t.fahrenheit)

The result:

C:\Users\gkuhn\Desktop>python test2.py
<__main__.Celsius instance at 0x02E95A80>
212

With Python prior to 3, make sure you subclass from object which will make the descriptor work correctly as the get magic does not work for old style classes.

An invalid form control with name='' is not focusable

You may try .removeAttribute("required") for those elements which are hidden at the time of window load. as it is quite probable that the element in question is marked hidden due to javascript (tabbed forms)

e.g.

if(document.getElementById('hidden_field_choice_selector_parent_element'.value==true){
    document.getElementById('hidden_field').removeAttribute("required");        
}

This should do the task.

It worked for me... cheers

Allow only numbers and dot in script

 <script type="text/Javascript">
        function checkDecimal(inputVal) {
            var ex = /^[0-9]+\.?[0-9]*$/;
            if (ex.test(inputVal.value) == false) {
                inputVal.value = inputVal.value.substring(0, inputVal.value.length - 1);
            }
        }
</script>

How to detect window.print() finish

On chrome (V.35.0.1916.153 m) Try this:

function loadPrint() {
    window.print();
    setTimeout(function () { window.close(); }, 100);
}

Works great for me. It will close window after user finished working on printing dialog.

AngularJS resource promise

You could also do:

Regions.query({}, function(response) {
    $scope.regions = response;
    // Do stuff that depends on $scope.regions here
});

Virtual member call in a constructor

Yes, it's generally bad to call virtual method in the constructor.

At this point, the objet may not be fully constructed yet, and the invariants expected by methods may not hold yet.

Add new field to every document in a MongoDB collection

To clarify, the syntax is as follows for MongoDB version 4.0.x:

db.collection.update({},{$set: {"new_field*":1}},false,true)

Here is a working example adding a published field to the articles collection and setting the field's value to true:

db.articles.update({},{$set: {"published":true}},false,true)

Adding elements to an xml file in C#

<Snippet name="abc">

name is an attribute, not an element. That's why it's failing. Look into using SetAttribute on the <Snippet> element.

root.SetAttribute("name", "name goes here");

is the code you need with what you have.

Python Matplotlib figure title overlaps axes label when using twiny

ax.set_title('My Title\n', fontsize="15", color="red")
plt.imshow(myfile, origin="upper")

If you put '\n' right after your title string, the plot is drawn just below the title. That might be a fast solution too.

How do I exit from the text window in Git?

There is a default text editor that will be used when Git needs you to type in a message. By default, Git uses your system’s default editor, which is generally Vi or Vim. In your case, it is Vim that Git has chosen. See How do I make Git use the editor of my choice for commits? for details of how to choose another editor. Meanwhile...

You'll want to enter a message before you leave Vim:

O

...will start a new line for you to type in.

To exit (g)Vim type:

EscZZ or Esc:wqReturn.

It's worth getting to know Vim, as you can use it for editing text on almost any platform. I recommend the Vim Tutor, I used it many years ago and have never looked back (barely a day goes by when I don't use Vim).

Get Mouse Position

import java.awt.MouseInfo;
import java.awt.GridLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

import javax.swing.*;

public class MyClass {
  public static void main(String[] args) throws InterruptedException{
    while(true){
      //Thread.sleep(100);
      System.out.println("(" + MouseInfo.getPointerInfo().getLocation().x + 
              ", " + 
              MouseInfo.getPointerInfo().getLocation().y + ")");
    }
  }
}

Programs & Examples On #Deployment descriptor

How to pass form input value to php function

Iterate over model instance field names and values in template

How to align texts inside of an input?

How can I strip all punctuation from a string in JavaScript using regex?

SELECT INTO using Oracle

Convert a Unix timestamp to time in JavaScript

Using mysql concat() in WHERE clause?

How do I parse JSON with Ruby on Rails?

What is the best way to auto-generate INSERT statements for a SQL Server table?

JSON order mixed up

How to connect to a secure website using SSL in Java with a pkcs12 file?

indexOf method in an object array?

Call a "local" function within module.exports from another function in module.exports?

jQuery Selector: Id Ends With?

Docker-Compose persistent data MySQL

How do you input command line arguments in IntelliJ IDEA?

Getting a POST variable

How do I get the AM/PM value from a DateTime?

How to provide animation when calling another activity in Android?

How to percent-encode URL parameters in Python?

How do I commit only some files?

What are the time complexities of various data structures?

Arrays

ArrayList:

Linked List:

Doubly-Linked List:

Stack:

Queue/Deque/Circular Queue:

Binary Search Tree:

Red-Black Tree:

Heap/PriorityQueue (min/max):

HashMap/Hashtable/HashSet:

How to paste text to end of every line? Sublime 2

CSS horizontal centering of a fixed div?

How do I center text horizontally and vertically in a TextView?

nginx server_name wildcard or catch-all

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