React Native android build failed. SDK location not found

Updated steps for React Native0.58 to get started on MAC/Unix

Open bash_profile in terminal

nano ~/.bash_profile

Scroll to bottom and add this lines from https://facebook.github.io/react-native/docs/getting-started:

export ANDROID_HOME=$HOME/Library/Android/sdk

export PATH=$PATH:$ANDROID_HOME/emulator

export PATH=$PATH:$ANDROID_HOME/tools

export PATH=$PATH:$ANDROID_HOME/tools/bin

export PATH=$PATH:$ANDROID_HOME/platform-tools

Control+S to save
Control+X to exit
Y to save changes

Update changes in terminal

source ~/.bash_profile

Validate Path:

echo $PATH

Confirm if all okay:

adb devices

Convert HTML string to image

Thanks all for your responses. I used HtmlRenderer external dll (library) to achieve the same and found below code for the same.

Here is the code for this

public void ConvertHtmlToImage()
{
   Bitmap m_Bitmap = new Bitmap(400, 600);
   PointF point = new PointF(0, 0);
   SizeF maxSize = new System.Drawing.SizeF(500, 500);
   HtmlRenderer.HtmlRender.Render(Graphics.FromImage(m_Bitmap),
                                           "<html><body><p>This is some html code</p>"
                                           + "<p>This is another html line</p></body>",
                                            point, maxSize);

   m_Bitmap.Save(@"C:\Test.png", ImageFormat.Png);
}

Add JVM options in Tomcat

if you want to set jvm args on eclipse you can use below:

see below two links to accomplish it:

And for Tomcat you can create a setenv.bat file in bin folder of Tomcat and add below lines to it :

echo "hello im starting setenv"
set CATALINA_OPTS=-DNLP.home=${NLP.home} -Dhostname=${hostname}

Set an environment variable in git bash

If you want to set environment variables permanently in Git-Bash, you have two options:

Set a regular Windows environment variable. Git-bash gets all existing Windows environment variables at startupp.
Set up env variables in .bash_profile file.

.bash_profile is by default located in a user home folder, like C:\users\userName\git-home\.bash_profile. You can change the path to the bash home folder by setting HOME Windows environment variable.

.bash_profile file uses the regular Bash syntax and commands

# Export a variable in .bash_profile
export DIR=c:\dir
# Nix path style works too
export DIR=/c/dir

# And don't forget to add quotes if a variable contains whitespaces
export ANOTHER_DIR="c:\some dir"

Read more information about Bash configurations files.

python to arduino serial read & write

First you have to install a module call Serial. To do that go to the folder call Scripts which is located in python installed folder. If you are using Python 3 version it's normally located in location below,

C:\Python34\Scripts

Once you open that folder right click on that folder with shift key. Then click on 'open command window here'. After that cmd will pop up. Write the below code in that cmd window,

pip install PySerial

and press enter.after that PySerial module will be installed. Remember to install the module u must have an INTERNET connection.

after successfully installed the module open python IDLE and write down the bellow code and run it.

import serial
# "COM11" is the port that your Arduino board is connected.set it to port that your are using        
ser = serial.Serial("COM11", 9600)
while True:
    cc=str(ser.readline())
    print(cc[2:][:-5])

The module ".dll" was loaded but the entry-point was not found

The error indicates that the DLL is either not a COM DLL or it's corrupt. If it's not a COM DLL and not being used as a COM DLL by an application then there is no need to register it.
From what you say in your question (the service is not registered) it seems that we are talking about a service not correctly installed. I will try to reinstall the application.

What is the proof of of (N–1) + (N–2) + (N–3) + ... + 1= N*(N–1)/2

Assume n=2. Then we have 2-1 = 1 on the left side and 2*1/2 = 1 on the right side.

Denote f(n) = (n-1)+(n-2)+(n-3)+...+1

Now assume we have tested up to n=k. Then we have to test for n=k+1.

on the left side we have k+(k-1)+(k-2)+...+1, so it's f(k)+k

On the right side we then have (k+1)*k/2 = (k^2+k)/2 = (k^2 +2k - k)/2 = k+(k-1)k/2 = kf(k)

So this have to hold for every k, and this concludes the proof.

Create directory if it does not exist

I had the exact same problem. You can use something like this:

$local = Get-Location;
$final_local = "C:\Processing";

if(!$local.Equals("C:\"))
{
    cd "C:\";
    if((Test-Path $final_local) -eq 0)
    {
        mkdir $final_local;
        cd $final_local;
        liga;
    }

    ## If path already exists
    ## DB Connect
    elseif ((Test-Path $final_local) -eq 1)
    {
        cd $final_local;
        echo $final_local;
        liga;  (function created by you TODO something)
    }
}

How do I print colored output with Python 3?

# Pure Python 3.x demo, 256 colors
# Works with bash under Linux and MacOS

fg = lambda text, color: "\33[38;5;" + str(color) + "m" + text + "\33[0m"
bg = lambda text, color: "\33[48;5;" + str(color) + "m" + text + "\33[0m"

def print_six(row, format):
    for col in range(6):
        color = row*6 + col + 4
        if color>=0:
            text = "{:3d}".format(color)
            print (format(text,color), end=" ")
        else:
            print("   ", end=" ")

for row in range(-1,42):
    print_six(row, fg)
    print("",end=" ")
    print_six(row, bg)
    print()

# Simple usage: print(fg("text", 160))

Font is not available to the JVM with Jasper Reports

I tried installing mscorefonts, but the package was installed and up-to-date.

sudo apt-get update
sudo apt-get install ttf-mscorefonts-installer

I tried searching for the font in the filesystem, with:

ls /usr/share/fonts/truetype/msttcorefonts/

This folder just had the README, with the correct instructions on how to install.

cat /usr/share/fonts/truetype/msttcorefonts/README

You need an internet connection for this:

sudo apt-get install --reinstall ttf-mscorefonts-installer

I re-installed ttf-mscorefonts-installer (as shown above, making sure to accept the EULA!) and the problem was solved.

Error: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'text/plain;charset=UTF-8' not supported

Building on what is mentioned in the comments, the simplest solution would be:

@RequestMapping(method = RequestMethod.PUT, consumes = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public Collection<BudgetDTO> updateConsumerBudget(@RequestBody SomeDto someDto) throws GeneralException, ParseException {

    //whatever

}

class SomeDto {

   private List<WhateverBudgerPerDateDTO> budgetPerDate;


  //getters setters
}

The solution assumes that the HTTP request you are creating actually has

Content-Type:application/json instead of text/plain

How to start jenkins on different port rather than 8080 using command prompt in Windows?

For the benefit of Linux users who find themselves here: I found /etc/sysconfig/jenkins has a JENKINS_PORT="8080", which you should probably change too.

Concatenating date with a string in Excel

This is the numerical representation of the date. The thing you get when referring to dates from formulas like that.

You'll have to do:

= A1 & TEXT(A2, "mm/dd/yyyy")

The biggest problem here is that the format specifier is locale-dependent. It will not work/produce not what expected if the file is opened with a differently localized Excel.

Now, you could have a user-defined function:

public function AsDisplayed(byval c as range) as string
  AsDisplayed = c.Text
end function

and then

= A1 & AsDisplayed(A2)

But then there's a bug (feature?) in Excel because of which the .Text property is suddenly not available during certain stages of the computation cycle, and your formulas display #VALUE instead of what they should.

That is, it's bad either way.

How to access private data members outside the class without making "friend"s?

EDIT:
Just saw you edited the question to say that you don't want to use friend.
Then the answer is:

NO you can't, atleast not in a portable way approved by the C++ standard.

The later part of the Answer, was previous to the Q edit & I leave it here for benefit of >those who would want to understand a few concepts & not just looking an Answer to the >Question.

If you have members under a Private access specifier then those members are only accessible from within the class. No outside Access is allowed.

An Source Code Example:

class MyClass
{
    private:
        int c;
    public:
    void doSomething()
    {
        c = 10;    //Allowed 
    }
};

int main()
{
    MyClass obj;
    obj.c = 30;     //Not Allowed, gives compiler error
    obj.doSomething();  //Allowed
}

A Workaround: friend to rescue
To access the private member, you can declare a function/class as friend of that particular class, and then the member will be accessible inside that function or class object without access specifier check.

Modified Code Sample:

class MyClass
{
    private:
        int c;

    public:
    void doSomething()
    {
        c = 10;    //Allowed 
    }

    friend void MytrustedFriend();    
};

void MytrustedFriend()
{
        MyClass obj;
        obj.c = 10; //Allowed
}

int main()
{
    MyClass obj;
    obj.c = 30;     //Not Allowed, gives compiler error
    obj.doSomething();  //Allowed
    //Call the friend function
    MytrustedFriend();
    return 0;
}

Dynamically access object property using variable

Following is an ES6 example of how you can access the property of an object using a property name that has been dynamically generated by concatenating two strings.

var suffix = " name";

var person = {
    ["first" + suffix]: "Nicholas",
    ["last" + suffix]: "Zakas"
};

console.log(person["first name"]);      // "Nicholas"
console.log(person["last name"]);       // "Zakas"

This is called computed property names

Checking oracle sid and database name

Type on sqlplus command prompt

SQL> select * from global_name;

then u will be see result on command prompt

SQL ORCL.REGRESS.RDBMS.DEV.US.ORACLE.COM

Here first one "ORCL" is database name,may be your system "XE" and other what was given on oracle downloading time.

How do I get PHP errors to display?

This code on top should work:

error_reporting(E_ALL);

However, try to edit the code on the phone in the file:

error_reporting =on

Determine if $.ajax error is a timeout

If your error event handler takes the three arguments (xmlhttprequest, textstatus, and message) when a timeout happens, the status arg will be 'timeout'.

Per the jQuery documentation:

Possible values for the second argument (besides null) are "timeout", "error", "notmodified" and "parsererror".

You can handle your error accordingly then.

I created this fiddle that demonstrates this.

$.ajax({
    url: "/ajax_json_echo/",
    type: "GET",
    dataType: "json",
    timeout: 1000,
    success: function(response) { alert(response); },
    error: function(xmlhttprequest, textstatus, message) {
        if(textstatus==="timeout") {
            alert("got timeout");
        } else {
            alert(textstatus);
        }
    }
});?

With jsFiddle, you can test ajax calls -- it will wait 2 seconds before responding. I put the timeout setting at 1 second, so it should error out and pass back a textstatus of 'timeout' to the error handler.

Hope this helps!

Merge two Excel tables Based on matching data in Columns

Put the table in the second image on Sheet2, columns D to F.

In Sheet1, cell D2 use the formula

=iferror(vlookup($A2,Sheet2!$D$1:$F$100,column(A1),false),"")

copy across and down.

Edit: here is a picture. The data is in two sheets. On Sheet1, enter the formula into cell D2. Then copy the formula across to F2 and then down as many rows as you need.

enter image description here

Same Navigation Drawer in different Activities

So this answer is a few years late but someone may appreciate it. Android has given us a new widget that makes using one navigation drawer with several activities easier.

android.support.design.widget.NavigationView is modular and has its own layout in the menu folder. The way that you use it is to wrap xml layouts the following way:

Root Layout is a android.support.v4.widget.DrawerLayout that contains two children: an <include ... /> for the layout that is being wrapped (see 2) and a android.support.design.widget.NavigationView.

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

<include
    layout="@layout/app_bar_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header_main"
    app:menu="@menu/activity_main_drawer" />

nav_header_main is just a LinearLayout with orientation = vertical for the header of your Navigation Drawar.

activity_main_drawer is a menu xml in your res/menu directory. It can contain items and groups of your choice. If you use the AndroidStudio Gallery the wizard will make a basic one for you and you can see what your options are.

App bar layout is usually now a android.support.design.widget.CoordinatorLayout and this will include two children: a android.support.design.widget.AppBarLayout (which contains a android.support.v7.widget.Toolbar) and an <include ... > for your actual content (see 3).

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="yourpackage.MainActivity">

 <android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_main" />

Content layout can be whatever layout you want. This is the layout that contains the main content of the activity (not including the navigation drawer or app bar).

Now, the cool thing about all of this is that you can wrap each activity in these two layouts but have your NavigationView (see step 1) always point to activity_main_drawer (or whatever). This means that you will have the same(*) Navigation Drawer on all activities.

They won't be the same instance of NavigationView but, to be fair, that wasn't possible even with the BaseActivity solution outlined above.

How to disable a input in angular2

can use simply like

     <input [(ngModel)]="model.name" disabled="disabled"

I got it like this way. so i prefer.

How can I find all of the distinct file extensions in a folder hierarchy?

None of the replies so far deal with filenames with newlines properly (except for ChristopheD's, which just came in as I was typing this). The following is not a shell one-liner, but works, and is reasonably fast.

import os, sys

def names(roots):
    for root in roots:
        for a, b, basenames in os.walk(root):
            for basename in basenames:
                yield basename

sufs = set(os.path.splitext(x)[1] for x in names(sys.argv[1:]))
for suf in sufs:
    if suf:
        print suf

jQuery animated number counter from zero to value

IMPORTANT: It seems like a small difference but you should really use a data attribute to hold the original number to count up to. Altering the original number can have un-intended consequences. For instance, I'm having this animation run everytime an element enters the screen. But if the element enters, exits, and then enters the screen a second time before the first animation finishes, it will count up to the wrong number.

HTML:

<p class="count" data-value="200" >200</p>
<p class="count" data-value="70" >70</p>
<p class="count" data-value="32" >32</p>

JQuery:

$('.count').each(function () {
    $(this).prop('Counter', 0).animate({
            Counter: $(this).data('value')
        }, {
        duration: 1000,
        easing: 'swing',
        step: function (now) {                      
            $(this).text(this.Counter.toFixed(2));
        }
    });
});

How to darken an image on mouseover?

I realise this is a little late but you could add the following to your code. This won't work for transparent pngs though, you'd need a cropping mask for that. Which I'm now going to see about.

outerLink {
    overflow: hidden;
    position: relative;
}

outerLink:hover:after {
    background: #000;
    content: "";
    display: block;
    height: 100%;
    left: 0;
    opacity: 0.5;
    position: absolute;
    top: 0;
    width: 100%;
}

How does spring.jpa.hibernate.ddl-auto property exactly work in Spring?

For the record, the spring.jpa.hibernate.ddl-auto property is Spring Data JPA specific and is their way to specify a value that will eventually be passed to Hibernate under the property it knows, hibernate.hbm2ddl.auto.

The values create, create-drop, validate, and update basically influence how the schema tool management will manipulate the database schema at startup.

For example, the update operation will query the JDBC driver's API to get the database metadata and then Hibernate compares the object model it creates based on reading your annotated classes or HBM XML mappings and will attempt to adjust the schema on-the-fly.

The update operation for example will attempt to add new columns, constraints, etc but will never remove a column or constraint that may have existed previously but no longer does as part of the object model from a prior run.

Typically in test case scenarios, you'll likely use create-drop so that you create your schema, your test case adds some mock data, you run your tests, and then during the test case cleanup, the schema objects are dropped, leaving an empty database.

In development, it's often common to see developers use update to automatically modify the schema to add new additions upon restart. But again understand, this does not remove a column or constraint that may exist from previous executions that is no longer necessary.

In production, it's often highly recommended you use none or simply don't specify this property. That is because it's common practice for DBAs to review migration scripts for database changes, particularly if your database is shared across multiple services and applications.

How to parse SOAP XML?

PHP version > 5.0 has a nice SoapClient integrated. Which doesn't require to parse response xml. Here's a quick example

$client = new SoapClient("http://path.to/wsdl?WSDL");
$res = $client->SoapFunction(array('param1'=>'value','param2'=>'value'));
echo $res->PaymentNotification->payment;

XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serverless)

Launch chrome like so to bypass this restriction: open -a "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" --args --allow-file-access-from-files.

Derived from Josh Lee's comment but I needed to specify the full path to Google Chrome so as to avoid having Google Chrome opening from my Windows partition (in Parallels).

how to select rows based on distinct values of A COLUMN only

use this(assume that your table name is emails):

select * from emails as a 
inner join  
(select EmailAddress, min(Id) as id from emails 
group by EmailAddress ) as b 
on a.EmailAddress = b.EmailAddress 
and a.Id = b.id

hope this help..

Load local JSON file into variable

My solution, as answered here, is to use:

    var json = require('./data.json'); //with path

The file is loaded only once, further requests use cache.

edit To avoid caching, here's the helper function from this blogpost given in the comments, using the fs module:

var readJson = (path, cb) => {
  fs.readFile(require.resolve(path), (err, data) => {
    if (err)
      cb(err)
    else
      cb(null, JSON.parse(data))
  })
}

Why can't I set text to an Android TextView?

The code should instead be something like this:

TextView text = (TextView) findViewById(R.id.this_is_the_id_of_textview);
text.setText("test");

Unfortunately MyApp has stopped. How can I solve this?

This popup shows only when you get a fatal exception in your code which stops the execution of the app. It could be any exception NullPointerException, OutOfMemoryException etc.

Best way to check is through Logcat if you are still developing the app in Android studio which is quick way to read stack trace and check the cause of the app.

If your app is already live, then you can not use logcat. So, for that you can implement Crashlytics to provide you bug reports of any exception that occurs.

Loop timer in JavaScript

I believe you are looking for setInterval()

Checking for directory and file write permissions in .NET

according to this link: http://www.authorcode.com/how-to-check-file-permission-to-write-in-c/

it's easier to use existing class SecurityManager

string FileLocation = @"C:\test.txt";
FileIOPermission writePermission = new FileIOPermission(FileIOPermissionAccess.Write, FileLocation);
if (SecurityManager.IsGranted(writePermission))
{
  // you have permission
}
else
{
 // permission is required!
}

but it seems it's been obsoleted, it is suggested to use PermissionSet instead.

[Obsolete("IsGranted is obsolete and will be removed in a future release of the .NET Framework.  Please use the PermissionSet property of either AppDomain or Assembly instead.")]

How to "grep" out specific line ranges of a file

Put this in a file and make it executable:

#!/bin/bash
start=`grep -n $1 < $3 | head -n1 | cut -d: -f1; exit ${PIPESTATUS[0]}`
if [ ${PIPESTATUS[0]} -ne 0 ]; then
    echo "couldn't find start pattern!" 1>&2
    exit 1
fi
stop=`tail -n +$start < $3 | grep -n $2 | head -n1 | cut -d: -f1; exit ${PIPESTATUS[1]}`
if [ ${PIPESTATUS[0]} -ne 0 ]; then
    echo "couldn't find end pattern!" 1>&2
    exit 1
fi

stop=$(( $stop + $start - 1))

sed "$start,$stop!d" < $3

Execute the file with arguments (NOTE that the script does not handle spaces in arguments!):

Starting grep pattern
Stopping grep pattern
File path

To use with your example, use arguments: 1234 5555 myfile.txt

Includes lines with starting and stopping pattern.

How to print current date on python3?

This function allows you to get the date and time in lots of formats (see the bottom of this post).

# Get the current date or time
def getdatetime(timedateformat='complete'):
    from datetime import datetime
    timedateformat = timedateformat.lower()
    if timedateformat == 'day':
        return ((str(datetime.now())).split(' ')[0]).split('-')[2]
    elif timedateformat == 'month':
        return ((str(datetime.now())).split(' ')[0]).split('-')[1]
    elif timedateformat == 'year':
        return ((str(datetime.now())).split(' ')[0]).split('-')[0]
    elif timedateformat == 'hour':
        return (((str(datetime.now())).split(' ')[1]).split('.')[0]).split(':')[0]
    elif timedateformat == 'minute':
        return (((str(datetime.now())).split(' ')[1]).split('.')[0]).split(':')[1]
    elif timedateformat == 'second':
        return (((str(datetime.now())).split(' ')[1]).split('.')[0]).split(':')[2]
    elif timedateformat == 'millisecond':
        return (str(datetime.now())).split('.')[1]
    elif timedateformat == 'yearmonthday':
        return (str(datetime.now())).split(' ')[0]
    elif timedateformat == 'daymonthyear':
        return ((str(datetime.now())).split(' ')[0]).split('-')[2] + '-' + ((str(datetime.now())).split(' ')[0]).split('-')[1] + '-' + ((str(datetime.now())).split(' ')[0]).split('-')[0]
    elif timedateformat == 'hourminutesecond':
        return ((str(datetime.now())).split(' ')[1]).split('.')[0]
    elif timedateformat == 'secondminutehour':
        return (((str(datetime.now())).split(' ')[1]).split('.')[0]).split(':')[2] + ':' + (((str(datetime.now())).split(' ')[1]).split('.')[0]).split(':')[1] + ':' + (((str(datetime.now())).split(' ')[1]).split('.')[0]).split(':')[0]
    elif timedateformat == 'complete':
        return str(datetime.now())
    elif timedateformat == 'datetime':
        return (str(datetime.now())).split('.')[0]
    elif timedateformat == 'timedate':
        return ((str(datetime.now())).split('.')[0]).split(' ')[1] + ' ' + ((str(datetime.now())).split('.')[0]).split(' ')[0]

To obtain the time or date, just use getdatetime("<TYPE>"), replacing <TYPE> with one of the following arguments:

All example outputs use this model information: 25-11-2017 03:23:56.477017

Argument	Meaning	Example output
day	Get the current day	25
month	Get the current month	11
year	Get the current year	2017
hour	Get the current hour	03
minute	Get the current minute	23
second	Get the current second	56
millisecond	Get the current millisecond	477017
yearmonthday	Get the year, month and day	2017-11-25
daymonthyear	Get the day, month and year	25-11-2017
hourminutesecond	Get the hour, minute and second	03:23:56
secondminutehour	Get the second, minute and hour	56:23:03
complete	Get the complete date and time	2017-11-25 03:23:56.477017
datetime	Get the date and time	2017-11-25 03:23:56
timedate	Get the time and date	03:23:56 2017-11-25

Forking vs. Branching in GitHub

It has to do with the general workflow of Git. You're unlikely to be able to push directly to the main project's repository. I'm not sure if GitHub project's repository support branch-based access control, as you wouldn't want to grant anyone the permission to push to the master branch for example.

The general pattern is as follows:

Fork the original project's repository to have your own GitHub copy, to which you'll then be allowed to push changes.
Clone your GitHub repository onto your local machine
Optionally, add the original repository as an additional remote repository on your local repository. You'll then be able to fetch changes published in that repository directly.
Make your modifications and your own commits locally.
Push your changes to your GitHub repository (as you generally won't have the write permissions on the project's repository directly).
Contact the project's maintainers and ask them to fetch your changes and review/merge, and let them push back to the project's repository (if you and them want to).

Without this, it's quite unusual for public projects to let anyone push their own commits directly.

Password encryption/decryption code in .NET

 string clearText = txtPassword.Text;
        string EncryptionKey = "MAKV2SPBNI99212";
        byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(clearBytes, 0, clearBytes.Length);
                    cs.Close();
                }
                clearText = Convert.ToBase64String(ms.ToArray());
            }
        }

Java swing application, close one window and open another when button is clicked

        final File open = new File("PicDic.exe");
        if (open.exists() == true) {
            if (Desktop.isDesktopSupported()) {
                javax.swing.SwingUtilities.invokeLater(new Runnable() {

                    public void run() {
                        try {
                            Desktop.getDesktop().open(open);
                        } catch (IOException ex) {
                            return;
                        }
                    }
                });

                javax.swing.SwingUtilities.invokeLater(new Runnable() {

                    public void run() {
                        //DocumentEditorView.this.getFrame().dispose();
                        System.exit(0);
                    }

                });
            } else {
                JOptionPane.showMessageDialog(this.getFrame(), "Desktop is not support to open editor\n You should try manualy");
            }
        } else {
            JOptionPane.showMessageDialog(this.getFrame(), "PicDic.exe is not found");
        }

//you can start another apps by using it and can slit your whole project in many apps. it will work lot

Reading data from XML

as per @Jon Skeet 's comment, you should use a XmlReader only if your file is very big. Here's how to use it. Assuming you have a Book class

public class Book {
    public string Title {get; set;}
    public string Author {get; set;}
}

you can read the XML file line by line with a small memory footprint, like this:

public static class XmlHelper {
    public static IEnumerable<Book> StreamBooks(string uri) {
        using (XmlReader reader = XmlReader.Create(uri)) {
            string title = null;
            string author = null;

            reader.MoveToContent();
            while (reader.Read()) {
                if (reader.NodeType == XmlNodeType.Element
                    && reader.Name == "Book") {
                    while (reader.Read()) {
                        if (reader.NodeType == XmlNodeType.Element &&
                            reader.Name == "Title") {
                            title = reader.ReadString();
                            break;
                        }
                    }
                    while (reader.Read()) {
                        if (reader.NodeType == XmlNodeType.Element &&
                            reader.Name == "Author") {
                            author =reader.ReadString();
                            break;
                        }
                    }
                    yield return new Book() {Title = title, Author = author};
                }
            }       
        }
    }

Example of usage:

string uri = @"c:\test.xml"; // your big XML file

foreach (var book in XmlHelper.StreamBooks(uri)) {
    Console.WriteLine("Title, Author: {0}, {1}", book.Title, book.Author);  
}

AltGr key not working, instead I have to use Ctrl+AltGr

I found a solution for my problem while writing my question !

Going into my remote session i tried two key combinations, and it solved the problem on my Desktop : Alt+Enter and Ctrl+Enter (i don't know which one solved the problem though)

I tried to reproduce the problem, but i couldn't... but i'm almost sure it's one of the key combinations described in the question above (since i experienced this problem several times)

So it seems the problem comes from the use of RDP (windows7 and 8)

Update 2017: Problem occurs on Windows 10 aswell.

View markdown files offline

Consider Strapdown.

Strapdown is Javascript-based solution that renders the markdown content in the browser, which makes it great for offline-viewing. From their own description:

Strapdown.js makes it embarrassingly simple to create elegant Markdown documents. No server-side compilation required.

So rename your .md markdown file to .html, and surround it with:

<xmp theme="united" style="display:none;">
# Markdown content here
…
</xmp>
<script src="http://strapdownjs.com/v/0.2/strapdown.js"></script>

and opening in any browser will show rendered HTML. Added bonus: you can easily change the theme.

How to make an array of arrays in Java

there is the class I mentioned in the comment we had with Sean Patrick Floyd : I did it with a peculiar use which needs WeakReference, but you can change it by any object with ease.

Hoping this can help someone someday :)

import java.lang.ref.WeakReference;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Queue;


/**
 *
 * @author leBenj
 */
public class Array2DWeakRefsBuffered<T>
{
    private final WeakReference<T>[][] _array;
    private final Queue<T> _buffer;

    private final int _width;

    private final int _height;

    private final int _bufferSize;

    @SuppressWarnings( "unchecked" )
    public Array2DWeakRefsBuffered( int w , int h , int bufferSize )
    {
        _width = w;
        _height = h;
        _bufferSize = bufferSize;
        _array = new WeakReference[_width][_height];
        _buffer = new LinkedList<T>();
    }

    /**
     * Tests the existence of the encapsulated object
     * /!\ This DOES NOT ensure that the object will be available on next call !
     * @param x
     * @param y
     * @return
     * @throws IndexOutOfBoundsException
     */public boolean exists( int x , int y ) throws IndexOutOfBoundsException
    {
        if( x >= _width || x < 0 )
        {
            throw new IndexOutOfBoundsException( "Index out of bounds (get) : [ x = " + x + "]" );
        }
        if( y >= _height || y < 0 )
        {
            throw new IndexOutOfBoundsException( "Index out of bounds (get) : [ y = " + y + "]" );
        }
        if( _array[x][y] != null )
        {
            T elem = _array[x][y].get();
            if( elem != null )
            {
            return true;
            }
        }
        return false;
    }

    /**
     * Gets the encapsulated object
     * @param x
     * @param y
     * @return
     * @throws IndexOutOfBoundsException
     * @throws NoSuchElementException
     */
    public T get( int x , int y ) throws IndexOutOfBoundsException , NoSuchElementException
    {
        T retour = null;
        if( x >= _width || x < 0 )
        {
            throw new IndexOutOfBoundsException( "Index out of bounds (get) : [ x = " + x + "]" );
        }
        if( y >= _height || y < 0 )
        {
            throw new IndexOutOfBoundsException( "Index out of bounds (get) : [ y = " + y + "]" );
        }
        if( _array[x][y] != null )
        {
            retour = _array[x][y].get();
            if( retour == null )
            {
            throw new NoSuchElementException( "Dereferenced WeakReference element at [ " + x + " ; " + y + "]" );
            }
        }
        else
        {
            throw new NoSuchElementException( "No WeakReference element at [ " + x + " ; " + y + "]" );
        }
        return retour;
    }

    /**
     * Add/replace an object
     * @param o
     * @param x
     * @param y
     * @throws IndexOutOfBoundsException
     */
    public void set( T o , int x , int y ) throws IndexOutOfBoundsException
    {
        if( x >= _width || x < 0 )
        {
            throw new IndexOutOfBoundsException( "Index out of bounds (set) : [ x = " + x + "]" );
        }
        if( y >= _height || y < 0 )
        {
            throw new IndexOutOfBoundsException( "Index out of bounds (set) : [ y = " + y + "]" );
        }
        _array[x][y] = new WeakReference<T>( o );

        // store local "visible" references : avoids deletion, works in FIFO mode
        _buffer.add( o );
        if(_buffer.size() > _bufferSize)
        {
            _buffer.poll();
        }
    }

}

Example of how to use it :

// a 5x5 array, with at most 10 elements "bufferized" -> the last 10 elements will not be taken by GC process
Array2DWeakRefsBuffered<Image> myArray = new Array2DWeakRefsBuffered<Image>(5,5,10);
Image img = myArray.set(anImage,0,0);
if(myArray.exists(3,3))
{
    System.out.println("Image at 3,3 is still in memory");
}

Adding a simple UIAlertView

This page shows how to add an UIAlertController if you are using Swift.

Cleanest way to toggle a boolean variable in Java?

This answer came up when searching for "java invert boolean function". The example below will prevent certain static analysis tools from failing builds due to branching logic. This is useful if you need to invert a boolean and haven't built out comprehensive unit tests ;)

Boolean.valueOf(aBool).equals(false)

or alternatively:

Boolean.FALSE.equals(aBool)

Boolean.FALSE::equals

How to compare two floating point numbers in Bash?

Use korn shell, in bash you may have to compare the decimal part separately

#!/bin/ksh
X=0.2
Y=0.2
echo $X
echo $Y

if [[ $X -lt $Y ]]
then
     echo "X is less than Y"
elif [[ $X -gt $Y ]]
then
     echo "X is greater than Y"
elif [[ $X -eq $Y ]]
then
     echo "X is equal to Y"
fi

How to use responsive background image in css3 in bootstrap

You need to use background-size: 100% 100%;

Demo

~~Demo 2~~ (Won't stretch, this is what you are doing)

Explanation: You need to use 100% 100% as it sets for X AS WELL AS Y, you are setting 100% just for the X parameter, thus the background doesn't stretch vertically.

Still, the image will stretch out, it won't be responsive, if you want to stretch the background proportionately, you can look for background-size: cover; but IE will create trouble for you here as it's CSS3 property, but yes, you can use CSS3 Pie as a polyfill. Also, using cover will crop your image.

JSON ValueError: Expecting property name: line 1 column 2 (char 1)

json.loads will load a json string into a python dict, json.dumps will dump a python dict to a json string, for example:

>>> json_string = '{"favorited": false, "contributors": null}'
'{"favorited": false, "contributors": null}'
>>> value = json.loads(json_string)
{u'favorited': False, u'contributors': None}
>>> json_dump = json.dumps(value)
'{"favorited": false, "contributors": null}'

So that line is incorrect since you are trying to load a python dict, and json.loads is expecting a valid json string which should have <type 'str'>.

So if you are trying to load the json, you should change what you are loading to look like the json_string above, or you should be dumping it. This is just my best guess from the given information. What is it that you are trying to accomplish?

Also you don't need to specify the u before your strings, as @Cld mentioned in the comments.

How to programmatically set the ForeColor of a label to its default?

You can also use

lblExamlple.ForeColor = System.Drawing.Color.FromArgb(0,255,0);

Jenkins Git Plugin: How to build specific tag?

Adding my two cents here since I have not seen an answer that uses the option "Build with parameters" in Jenkins.

Here I am using Jenkins CI browser console for project starwars_api and I was able to build directly with "Build with parameters" with value refs/tags/tag-name

choose the "build with parameters" option.
add value in the box as "refs/tags/tag_142" (tag_name = tag_142 for my example)

build with ref tag name

How do you do a deep copy of an object in .NET?

Building on Kilhoffer's solution...

With C# 3.0 you can create an extension method as follows:

public static class ExtensionMethods
{
    // Deep clone
    public static T DeepClone<T>(this T a)
    {
        using (MemoryStream stream = new MemoryStream())
        {
            BinaryFormatter formatter = new BinaryFormatter();
            formatter.Serialize(stream, a);
            stream.Position = 0;
            return (T) formatter.Deserialize(stream);
        }
    }
}

which extends any class that's been marked as [Serializable] with a DeepClone method

MyClass copy = obj.DeepClone();

Return in Scala

This topic is actually a little more complicated as described in the answers so far. This blogpost by Rob Norris explains it in more detail and gives examples on when using return will actually break your code (or at least have non-obvious effects).

At this point let me just quote the essence of the post. The most important statement is right in the beginning. Print this as a poster and put it to your wall :-)

The return keyword is not “optional” or “inferred”; it changes the meaning of your program, and you should never use it.

It gives one example, where it actually breaks something, when you inline a function

// Inline add and addR
def sum(ns: Int*): Int = ns.foldLeft(0)((n, m) => n + m) // inlined add

scala> sum(33, 42, 99)
res2: Int = 174 // alright

def sumR(ns: Int*): Int = ns.foldLeft(0)((n, m) => return n + m) // inlined addR

scala> sumR(33, 42, 99)
res3: Int = 33 // um.

because

A return expression, when evaluated, abandons the current computation and returns to the caller of the method in which return appears.

This is only one of the examples given in the linked post and it's the easiest to understand. There're more and I highly encourage you, to go there, read and understand.

When you come from imperative languages like Java, this might seem odd at first, but once you get used to this style it will make sense. Let me close with another quote:

If you find yourself in a situation where you think you want to return early, you need to re-think the way you have defined your computation.

How to check if a string contains text from an array of substrings in JavaScript?

One line solution

substringsArray.some(substring=>yourBigString.includes(substring))

Returns true\false if substring exists\does'nt exist

Needs ES6 support

Check whether user has a Chrome extension installed

Another possible solution if you own the website is to use inline installation.

if (chrome.app.isInstalled) {
  // extension is installed.
}

I know this an old question but this way was introduced in Chrome 15 and so I thought Id list it for anyone only now looking for an answer.

When does System.gc() do something?

Accroding to Thinking in Java by Bruce Eckel, one use case for explicit System.gc() call is when you want to force finalization, i.e. the call to finalize method.

How can I use pointers in Java?

As Java has no pointer data types, it is impossible to use pointers in Java. Even the few experts will not be able to use pointers in java.

See also the last point in: The Java Language Environment

Draw an X in CSS

HTML

<div class="close-orange"></div>

CSS

.close-orange {
  height: 100px;
  width: 100px;
  background-color: #FA6900;
  border-radius: 5px;
}
.close-orange:before,.close-orange:after{
  content:'';
  position:absolute;
  width: 50px;
  height: 4px;
  background-color:white;
  border-radius:2px;
  top: 55px;
}
.close-orange:before{
  -webkit-transform:rotate(45deg);
  -moz-transform:rotate(45deg);
  transform:rotate(45deg);
  left: 32.5px;
}
.close-orange:after{
  -webkit-transform:rotate(-45deg);
  -moz-transform:rotate(-45deg);
  transform:rotate(-45deg);
  left: 32.5px;
}

https://jsfiddle.net/cooperwebdesign/dw4xd289/

Create an empty object in JavaScript with {} or new Object()?

Array instantiation performance

If you wish to create an array with no length:

var arr = []; is faster than var arr = new Array();

If you wish to create an empty array with a certain length:

var arr = new Array(x); is faster than var arr = []; arr[x-1] = undefined;

For benchmarks click the following: https://jsfiddle.net/basickarl/ktbbry5b/

I do not however know the memory footprint of both, I can imagine that new Array() takes up more space.

How to replace a string in multiple files in linux command line

To replace a path within files (avoiding escape characters) you may use the following command:

sed -i 's@old_path@new_path@g'

The @ sign means that all of the special characters should be ignored in a following string.

TypeError: 'float' object not iterable

use

range(count)

int and float are not iterable

How to check if an array is empty?

Your test:

if (numberSet.length < 2) {
    return 0;
}

should be done before you allocate an array of that length in the below statement:

int[] differenceArray = new int[numberSet.length-1];

else you are already creating an array of size -1, when the numberSet.length = 0. That is quite odd. So, move your if statement as the first statement in your method.

overlay opaque div over youtube iframe

Note that the wmode=transparent fix only works if it's first so

http://www.youtube.com/embed/K3j9taoTd0E?wmode=transparent&rel=0

Not

http://www.youtube.com/embed/K3j9taoTd0E?rel=0&wmode=transparent

Selecting Multiple Values from a Dropdown List in Google Spreadsheet

To Add to AlexG's answer, a better and enhanced version of multi-select is found in this following link (which I tried and worked as expected):

https://gist.github.com/coinsandsteeldev/4c67dfa5411e8add913273fc5a30f5e7

For general guidance on setting up a script in Google Sheets, see this quickstart guide.

To use this script:

In your Google Sheet, set up data validation for a cell (or cells), using data from a range. In cell validation, do not select 'Reject input'.
Go to Tools > Script editor...
In the script editor, go to File > New > Script file
Name the file multi-select.gs and paste in the contents of multi-select.gs. File > Save.
In the script editor, go to File > New > Html file Name the file dialog.html and paste in the contents of dialog.html. File > Save.
Back in your spreadsheet, you should now have a new menu called 'Scripts'. Refresh the page if necessary.
Select the cell you want to fill with multiple items from your validation range.
Go to Scripts > Multi-select for this cell... and the sidebar should open, showing a checklist of valid items.
Tick the items you want and click the 'Set' button to fill your cell with those selected items, comma separated.

You can leave the script sidebar open. When you select any cell that has validation, click 'Refresh validation' in the script sidebar to bring up that cell's checklist.

The above mentioned steps are taken from this link

invalid_grant trying to get oAuth token from google

You might have to remove a stale/invalid OAuth response.

Credit: node.js google oauth2 sample stopped working invalid_grant

Note: An OAuth response will also become invalid if the password used in the initial authorization has been changed.

If in a bash environment, you can use the following to remove the stale response:

rm /Users/<username>/.credentials/<authorization.json>

In log4j, does checking isDebugEnabled before logging improve performance?

For a single line, I use a ternary inside of logging message, In this way I don't do the concatenation:

ej:

logger.debug(str1 + str2 + str3 + str4);

I do:

logger.debug(logger.isDebugEnable()?str1 + str2 + str3 + str4:null);

But for multiple lines of code

ej.

for(Message mess:list) {
    logger.debug("mess:" + mess.getText());
}

I do:

if(logger.isDebugEnable()) {
    for(Message mess:list) {
         logger.debug("mess:" + mess.getText());
    }
}

Lock, mutex, semaphore... what's the difference?

Wikipedia has a great section on the differences between Semaphores and Mutexes:

A mutex is essentially the same thing as a binary semaphore and sometimes uses the same basic implementation. The differences between them are:

Mutexes have a concept of an owner, which is the process that locked the mutex. Only the process that locked the mutex can unlock it. In contrast, a semaphore has no concept of an owner. Any process can unlock a semaphore.

Unlike semaphores, mutexes provide priority inversion safety. Since the mutex knows its current owner, it is possible to promote the priority of the owner whenever a higher-priority task starts waiting on the mutex.

Mutexes also provide deletion safety, where the process holding the mutex cannot be accidentally deleted. Semaphores do not provide this.

How do you use global variables or constant values in Ruby?

Variable scope in Ruby is controlled by sigils to some degree. Variables starting with $ are global, variables with @ are instance variables, @@ means class variables, and names starting with a capital letter are constants. All other variables are locals. When you open a class or method, that's a new scope, and locals available in the previous scope aren't available.

I generally prefer to avoid creating global variables. There are two techniques that generally achieve the same purpose that I consider cleaner:

Create a constant in a module. So in this case, you would put all the classes that need the offset in the module Foo and create a constant Offset, so then all the classes could access Foo::Offset.
Define a method to access the value. You can define the method globally, but again, I think it's better to encapsulate it in a module or class. This way the data is available where you need it and you can even alter it if you need to, but the structure of your program and the ownership of the data will be clearer. This is more in line with OO design principles.

Split string to equal length substrings in Java

Here is my version based on RegEx and Java 8 streams. It's worth to mention that Matcher.results() method is available since Java 9.

Test included.

public static List<String> splitString(String input, int splitSize) {
    Matcher matcher = Pattern.compile("(?:(.{" + splitSize + "}))+?").matcher(input);
    return matcher.results().map(MatchResult::group).collect(Collectors.toList());
}

@Test
public void shouldSplitStringToEqualLengthParts() {
    String anyValidString = "Split me equally!";
    String[] expectedTokens2 = {"Sp", "li", "t ", "me", " e", "qu", "al", "ly"};
    String[] expectedTokens3 = {"Spl", "it ", "me ", "equ", "all"};

    Assert.assertArrayEquals(expectedTokens2, splitString(anyValidString, 2).toArray());
    Assert.assertArrayEquals(expectedTokens3, splitString(anyValidString, 3).toArray());
}

What does it mean when the size of a VARCHAR2 in Oracle is declared as 1 byte?

To answer you first question:
Yes, it means that 1 byte allocates for 1 character. Look at this example

SQL> conn / as sysdba
Connected.
SQL> create table test (id number(10), v_char varchar2(10));

Table created.

SQL> insert into test values(11111111111,'darshan');
insert into test values(11111111111,'darshan')
*
ERROR at line 1:
ORA-01438: value larger than specified precision allows for this column


SQL> insert into test values(11111,'darshandarsh');
insert into test values(11111,'darshandarsh')
*
ERROR at line 1:
ORA-12899: value too large for column "SYS"."TEST"."V_CHAR" (actual: 12,
maximum: 10)


SQL> insert into test values(111,'Darshan');

1 row created.

SQL>

And to answer your next one: The difference between varchar2 and varchar :

VARCHAR can store up to 2000 bytes of characters while VARCHAR2 can store up to 4000 bytes of characters.
If we declare datatype as VARCHAR then it will occupy space for NULL values, In case of VARCHAR2 datatype it will not occupy any space.

Output to the same line overwriting previous output?

Here's my little class that can reprint blocks of text. It properly clears the previous text so you can overwrite your old text with shorter new text without creating a mess.

import re, sys

class Reprinter:
    def __init__(self):
        self.text = ''

    def moveup(self, lines):
        for _ in range(lines):
            sys.stdout.write("\x1b[A")

    def reprint(self, text):
        # Clear previous text by overwritig non-spaces with spaces
        self.moveup(self.text.count("\n"))
        sys.stdout.write(re.sub(r"[^\s]", " ", self.text))

        # Print new text
        lines = min(self.text.count("\n"), text.count("\n"))
        self.moveup(lines)
        sys.stdout.write(text)
        self.text = text

reprinter = Reprinter()

reprinter.reprint("Foobar\nBazbar")
reprinter.reprint("Foo\nbar")

Html: Difference between cell spacing and cell padding

Cell spacing and margin is the space between cells.

Cell padding is space inside cells, between the cell border (even if invisible) and the cell content, such as text.

ImportError: No module named 'google'

According to https://developers.google.com/api-client-library/python/apis/oauth2/v1 you need to install google-api-python-client package:

pip install --upgrade google-api-python-client

Which command in VBA can count the number of characters in a string variable?

Do you mean counting the number of characters in a string? That's very simple

Dim strWord As String
Dim lngNumberOfCharacters as Long

strWord = "habit"
lngNumberOfCharacters = Len(strWord)
Debug.Print lngNumberOfCharacters

What should be the values of GOPATH and GOROOT?

GOPATH is discussed here:

The GOPATH Environment Variable

GOPATH may be set to a colon-separated list of paths inside which Go code, package objects, and executables may be found.

Set a GOPATH to use goinstall to build and install your own code and external libraries outside of the Go tree (and to avoid writing Makefiles).

And GOROOT is discussed here:

$GOROOT The root of the Go tree, often $HOME/go. This defaults to the parent of the directory where all.bash is run. If you choose not to set $GOROOT, you must run gomake instead of make or gmake when developing Go programs using the conventional makefiles.

C# find highest array value and index

Here is a LINQ solution which is O(n) with decent constant factors:

int[] anArray = { 1, 5, 2, 7, 1 };

int index = 0;
int maxIndex = 0;

var max = anArray.Aggregate(
    (oldMax, element) => {
        ++index;
        if (element <= oldMax)
            return oldMax;
        maxIndex = index;
        return element;
    }
);

Console.WriteLine("max = {0}, maxIndex = {1}", max, maxIndex);

But you should really write an explicit for lop if you care about performance.

How to update/modify an XML file in python?

For the modification, you could use tag.text from xml. Here is snippet:

import xml.etree.ElementTree as ET

tree = ET.parse('country_data.xml')
root = tree.getroot()

for rank in root.iter('rank'):
    new_rank = int(rank.text) + 1
    rank.text = str(new_rank)
    
tree.write('output.xml')

The rank in the code is example of tag, which depending on your XML file contents.

How to resolve 'unrecognized selector sent to instance'?

Very weird, but. You have to declare the class for your application instance as myApplication: UIApplication instead of myApplication: NSObject . It seems that the UIApplicationDelegate protocol doesn't implement the +registerForSystemEvents message. Crazy Apple APIs, again.

std::thread calling method of class

Not so hard:

#include <thread>

void Test::runMultiThread()
{
    std::thread t1(&Test::calculate, this,  0, 10);
    std::thread t2(&Test::calculate, this, 11, 20);
    t1.join();
    t2.join();
}

If the result of the computation is still needed, use a future instead:

#include <future>

void Test::runMultiThread()
{
     auto f1 = std::async(&Test::calculate, this,  0, 10);
     auto f2 = std::async(&Test::calculate, this, 11, 20);

     auto res1 = f1.get();
     auto res2 = f2.get();
}

.ssh/config file for windows (git)

If you use "Git for Windows"

>cd c:\Program Files\Git\etc\ssh\

add to ssh_config following:

AddKeysToAgent yes
IdentityFile ~/.ssh/id_rsa
IdentityFile ~/.ssh/id_rsa_test

ps. you need ssh version >= 7.2 (date of release 2016-02-28)

Is there a difference between `continue` and `pass` in a for loop in python?

Difference between pass and continue in a for loop:

So why pass in python?

If you want to create a empty class, method or block.

Examples:

class MyException(Exception):
    pass


try:
   1/0
 except:
   pass

without 'pass' in the above examples will throw IndentationError.

Only variables should be passed by reference

end(...[explode('.', $file_name)]) has worked since PHP 5.6. This is documented in the RFC although not in PHP docs themselves.

Is it safe to shallow clone with --depth 1, create commits, and pull updates again?

Note that Git 1.9/2.0 (Q1 2014) has removed that limitation.
See commit 82fba2b, from Nguy?n Thái Ng?c Duy (pclouds):

Now that git supports data transfer from or to a shallow clone, these limitations are not true anymore.

The documentation now reads:

--depth <depth>::

Create a 'shallow' clone with a history truncated to the specified number of revisions.

That stems from commits like 0d7d285, f2c681c, and c29a7b8 which support clone, send-pack /receive-pack with/from shallow clones.
smart-http now supports shallow fetch/clone too.

All the details are in "shallow.c: the 8 steps to select new commits for .git/shallow".

Update June 2015: Git 2.5 will even allow for fetching a single commit!
(Ultimate shallow case)

Update January 2016: Git 2.8 (Mach 2016) now documents officially the practice of getting a minimal history.
See commit 99487cf, commit 9cfde9e (30 Dec 2015), commit 9cfde9e (30 Dec 2015), commit bac5874 (29 Dec 2015), and commit 1de2e44 (28 Dec 2015) by Stephen P. Smith (``).
^{(Merged by Junio C Hamano -- gitster -- in commit 7e3e80a, 20 Jan 2016)}

This is "Documentation/user-manual.txt"

A <<def_shallow_clone,shallow clone>> is created by specifying the git-clone --depth switch.
The depth can later be changed with the git-fetch --depth switch, or full history restored with --unshallow.

Merging inside a <<def_shallow_clone,shallow clone>> will work as long as a merge base is in the recent history.
Otherwise, it will be like merging unrelated histories and may have to result in huge conflicts.
This limitation may make such a repository unsuitable to be used in merge based workflows.

Update 2020:

git 2.11.1 introduced option git fetch --shallow-exclude= to prevent fetching all history
git 2.11.1 introduced option git fetch --shallow-since= to prevent fetching old commits.

For more on the shallow clone update process, see "How to update a git shallow clone?".

As commented by Richard Michael:

to backfill history: git pull --unshallow

And Olle Härstedt adds in the comments:

To backfill part of the history: git fetch --depth=100.

How to round the minute of a datetime object

A two line intuitive solution to round to a given time unit, here seconds, for a datetime object t:

format_str = '%Y-%m-%d %H:%M:%S'
t_rounded = datetime.strptime(datetime.strftime(t, format_str), format_str)

If you wish to round to a different unit simply alter format_str.

This approach does not round to arbitrary time amounts as above methods, but is a nicely Pythonic way to round to a given hour, minute or second.

Adb install failure: INSTALL_CANCELED_BY_USER

I tried all the steps described above but failed.

Like, connect to the internet with Data connection, Turning off the MIUI optimization and reboot, Turning on Install via USB from Security settings etc.

Then I found a solution.

Steps:

Install PlexVPN.
set China-Shanghai server
Try turning on Install via USB from Developer option.

That's all.

Lotus Notes email as an attachment to another email

Answer from Chris is not possible because there is no save mail option (at least in version 8.5) in LN

It is possible, File > Save As

Assigning the output of a command to a variable

Try:

output=$(ps -ef | awk '/siebsvc –s siebsrvr/ && !/awk/ { a++ } END { print a }'); echo $output

Wrapping your command in $( ) tells the shell to run that command, instead of attempting to set the command itself to the variable named "output". (Note that you could also use backticks `command`.)

I can highly recommend http://tldp.org/LDP/abs/html/commandsub.html to learn more about command substitution.

Also, as 1_CR correctly points out in a comment, the extra space between the equals sign and the assignment is causing it to fail. Here is a simple example on my machine of the behavior you are experiencing:

jed@MBP:~$ foo=$(ps -ef |head -1);echo $foo
UID PID PPID C STIME TTY TIME CMD

jed@MBP:~$ foo= $(ps -ef |head -1);echo $foo
-bash: UID: command not found
UID PID PPID C STIME TTY TIME CMD

Extract substring using regexp in plain bash

Using pure bash :

$ cat file.txt
US/Central - 10:26 PM (CST)
$ while read a b time x; do [[ $b == - ]] && echo $time; done < file.txt

another solution with bash regex :

$ [[ "US/Central - 10:26 PM (CST)" =~ -[[:space:]]*([0-9]{2}:[0-9]{2}) ]] &&
    echo ${BASH_REMATCH[1]}

another solution using grep and look-around advanced regex :

$ echo "US/Central - 10:26 PM (CST)" | grep -oP "\-\s+\K\d{2}:\d{2}"

another solution using sed :

$ echo "US/Central - 10:26 PM (CST)" |
    sed 's/.*\- *\([0-9]\{2\}:[0-9]\{2\}\).*/\1/'

another solution using perl :

$ echo "US/Central - 10:26 PM (CST)" |
    perl -lne 'print $& if /\-\s+\K\d{2}:\d{2}/'

and last one using awk :

$ echo "US/Central - 10:26 PM (CST)" |
    awk '{for (i=0; i<=NF; i++){if ($i == "-"){print $(i+1);exit}}}'

define() vs. const

As of PHP 5.3 there are two ways to define constants: Either using the const keyword or using the define() function:

const FOO = 'BAR';
define('FOO', 'BAR');

The fundamental difference between those two ways is that const defines constants at compile time, whereas define defines them at run time. This causes most of const's disadvantages. Some disadvantages of const are:

const cannot be used to conditionally define constants. To define a global constant, it has to be used in the outermost scope:
```
if (...) {
    const FOO = 'BAR';    // Invalid
}
// but
if (...) {
    define('FOO', 'BAR'); // Valid
}
```
Why would you want to do that anyway? One common application is to check whether the constant is already defined:
```
if (!defined('FOO')) {
    define('FOO', 'BAR');
}
```
const accepts a static scalar (number, string or other constant like true, false, null, __FILE__), whereas define() takes any expression. Since PHP 5.6 constant expressions are allowed in const as well:
```
const BIT_5 = 1 << 5;    // Valid since PHP 5.6 and invalid previously
define('BIT_5', 1 << 5); // Always valid
```
const takes a plain constant name, whereas define() accepts any expression as name. This allows to do things like this:
```
for ($i = 0; $i < 32; ++$i) {
    define('BIT_' . $i, 1 << $i);
}
```
consts are always case sensitive, whereas define() allows you to define case insensitive constants by passing true as the third argument (Note: defining case-insensitive constants is deprecated as of PHP 7.3.0.):
```
define('FOO', 'BAR', true);
echo FOO; // BAR
echo foo; // BAR
```

So, that was the bad side of things. Now let's look at the reason why I personally always use const unless one of the above situations occurs:

const simply reads nicer. It's a language construct instead of a function and also is consistent with how you define constants in classes.
const, being a language construct, can be statically analysed by automated tooling.
const defines a constant in the current namespace, while define() has to be passed the full namespace name:
```
namespace A\B\C;
// To define the constant A\B\C\FOO:
const FOO = 'BAR';
define('A\B\C\FOO', 'BAR');
```
Since PHP 5.6 const constants can also be arrays, while define() does not support arrays yet. However, arrays will be supported for both cases in PHP 7.
```
const FOO = [1, 2, 3];    // Valid in PHP 5.6
define('FOO', [1, 2, 3]); // Invalid in PHP 5.6 and valid in PHP 7.0
```

Finally, note that const can also be used within a class or interface to define a class constant or interface constant. define cannot be used for this purpose:

class Foo {
    const BAR = 2; // Valid
}
// But
class Baz {
    define('QUX', 2); // Invalid
}

Summary

Unless you need any type of conditional or expressional definition, use consts instead of define()s - simply for the sake of readability!

XPath to select Element by attribute value

As a follow on, you could select "all nodes with a particular attribute" like this:

//*[@id='4']

Extract and delete all .gz in a directory- Linux

Extract all gz files in current directory and its subdirectories:

 find . -name "*.gz" | xargs gunzip

Can't drop table: A foreign key constraint fails

This should do the trick:

SET FOREIGN_KEY_CHECKS=0; DROP TABLE bericht; SET FOREIGN_KEY_CHECKS=1;

As others point out, this is almost never what you want, even though it's whats asked in the question. A more safe solution is to delete the tables depending on bericht before deleting bericht. See CloudyMarble answer on how to do that. I use bash and the method in my post to drop all tables in a database when I don't want to or can't delete and recreate the database itself.

The #1217 error happens when other tables has foreign key constraints to the table you are trying to delete and you are using the InnoDB database engine. This solution temporarily disables checking the restraints and then re-enables them. Read the documentation for more. Be sure to delete foreign key restraints and fields in tables depending on bericht, otherwise you might leave your database in a broken state.

Microsoft.ACE.OLEDB.12.0 is not registered

I installed the "Microsoft Access Database Engine 2010 Redistributable" as mentioned above and got side-tracked troubleshooting bitness issues when it seemed to be a version issue.

Installing "2007 Office System Driver: Data Connectivity Components" sorted it for me.

https://www.microsoft.com/en-us/download/details.aspx?id=23734

PHP - check if variable is undefined

You can use the PHP isset() function to test whether a variable is set or not. The isset() will return FALSE if testing a variable that has been set to NULL. Example:

<?php
    $var1 = '';
    if(isset($var1)){
        echo 'This line is printed, because the $var1 is set.';
    }
?>

This code will output "This line is printed, because the $var1 is set."

Cannot connect to local SQL Server with Management Studio

I was having this problem on a Windows 7 (64 bit) after a power outage. The SQLEXPRESS service was not started even though is status was set to 'Automatic' and the mahine had been rebooted several times. Had to start the service manually.

How to load a UIView using a nib file created with Interface Builder

I'm not sure what some of the answers are talking about, but I need to put this answer here for when I search in Google next time. Keywords: "How to load a UIView from a nib" or "How to load a UIView from an NSBundle."

Here's the code almost 100% straight up from the Apress Beginning iPhone 3 book (page 247, "Using The New Table View Cell"):

- (void)viewDidLoad {
    [super viewDidLoad];
    NSArray *bundle = [[NSBundle mainBundle] loadNibNamed:@"Blah"
                                                 owner:self options:nil];
    Blah *blah;
    for (id object in bundle) {
        if ([object isKindOfClass:[Blah class]]) {
            blah = (Blah *)object;
            break;
        }
    }   
    assert(blah != nil && "blah can't be nil");
    [self.view addSubview: blah];
}

This supposes you have a UIView subclass called Blah, a nib called Blah which contains a UIView which has its class set to Blah.

Category: NSObject+LoadFromNib

#import "NSObject+LoadFromNib.h"

@implementation NSObject (LoadFromNib)

+ (id)loadFromNib:(NSString *)name classToLoad:(Class)classToLoad {
    NSArray *bundle = [[NSBundle mainBundle] loadNibNamed:name owner:self options:nil];
    for (id object in bundle) {
        if ([object isKindOfClass:classToLoad]) {
            return object;
        }
    }
    return nil;
}

@end

Swift Extension

extension UIView {
    class func loadFromNib<T>(withName nibName: String) -> T? {
        let nib  = UINib.init(nibName: nibName, bundle: nil)
        let nibObjects = nib.instantiate(withOwner: nil, options: nil)
        for object in nibObjects {
            if let result = object as? T {
                return result
            }
        }
        return nil
    }
}

And an example in use:

class SomeView: UIView {
    class func loadFromNib() -> SomeView? {
        return self.loadFromNib(withName: "SomeView")
    }
}

How do I change a TCP socket to be non-blocking?

I know it's an old question, but for everyone on google ending up here looking for information on how to deal with blocking and non-blocking sockets here is an in depth explanation of the different ways how to deal with the I/O modes of sockets - http://dwise1.net/pgm/sockets/blocking.html.

Quick summary:

So Why do Sockets Block?
What are the Basic Programming Techniques for Dealing with Blocking Sockets?
- Have a design that doesn't care about blocking
- Using select
- Using non-blocking sockets.
- Using multithreading or multitasking

How to parse JSON string in Typescript

There is a great library for it ts-json-object

In your case you would need to run the following code:

import {JSONObject, required} from 'ts-json-object'

class Response extends JSONObject {
    @required
    name: string;

    @required
    error: boolean;
}

let resp = new Response({"name": "Bob", "error": false});

This library will validate the json before parsing

Installing tensorflow with anaconda in windows

Google has recently launched a newer version of Tesnsorflow r0.12 which include support of Windows both CPU and GPU version can now be installed using Python >=3.5.2 (only 64-bit) version.

For CPU only version open command prompt and enter follow command

pip install --upgrade https://storage.googleapis.com/tensorflow/windows/cpu/tensorflow-0.12.0rc0-cp35-cp35m-win_amd64.whl

Follow this Tensorflow on Windows for step by step instructions.

UPDATE

To install current latest version please run following command:

pip install tensorflow #CPU only
pip install tensorflow-gpu #For GPU support

UPDATE 2020

Tensorflow 2.0 now has a single package for both CPU and GPU version, simply run

pip install tensorflow

If your're using Anaconda you can install Tensorflow GPU version and all of its dependencies (CUDA, cuDNN) by running:

conda install -c tensorflow-gpu

Format Instant to String

Or if you still want to use formatter created from pattern you can just use LocalDateTime instead of Instant:

LocalDateTime datetime = LocalDateTime.now();
DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(datetime)

Changing permissions via chmod at runtime errors with "Operation not permitted"

In order to perform chmod, you need to be owner of the file you are trying to modify, or the root user.

How to add a new line of text to an existing file in Java?

Starting from Java 7:

Define a path and the String containing the line separator at the beginning:

Path p = Paths.get("C:\\Users\\first.last\\test.txt");
String s = System.lineSeparator() + "New Line!";

and then you can use one of the following approaches:

Using Files.write (small files):

try {
    Files.write(p, s.getBytes(), StandardOpenOption.APPEND);
} catch (IOException e) {
    System.err.println(e);
}

Using Files.newBufferedWriter(text files):

try (BufferedWriter writer = Files.newBufferedWriter(p, StandardOpenOption.APPEND)) {
    writer.write(s);
} catch (IOException ioe) {
    System.err.format("IOException: %s%n", ioe);
}

Using Files.newOutputStream (interoperable with java.io APIs):

try (OutputStream out = new BufferedOutputStream(Files.newOutputStream(p, StandardOpenOption.APPEND))) {
    out.write(s.getBytes());
} catch (IOException e) {
    System.err.println(e);
}

Using Files.newByteChannel (random access files):

try (SeekableByteChannel sbc = Files.newByteChannel(p, StandardOpenOption.APPEND)) {
    sbc.write(ByteBuffer.wrap(s.getBytes()));
} catch (IOException e) {
    System.err.println(e);
}

Using FileChannel.open (random access files):

try (FileChannel sbc = FileChannel.open(p, StandardOpenOption.APPEND)) {
    sbc.write(ByteBuffer.wrap(s.getBytes()));
} catch (IOException e) {
    System.err.println(e);
}

Details about these methods can be found in the Oracle's tutorial.

How to change sa password in SQL Server 2008 express?

This may help you to reset your sa password for SQL 2008 and 2012

EXEC sp_password NULL, 'yourpassword', 'sa'

How to schedule a periodic task in Java?

Try this way ->

Firstly create a class TimeTask that run your task, it looks like:

public class CustomTask extends TimerTask  {

   public CustomTask(){

     //Constructor

   }

   public void run() {
       try {

         // Your task process

       } catch (Exception ex) {
           System.out.println("error running thread " + ex.getMessage());
       }
    }
}

then in main class you instantiate the task and run it periodically started by a specified date:

 public void runTask() {

        Calendar calendar = Calendar.getInstance();
        calendar.set(
           Calendar.DAY_OF_WEEK,
           Calendar.MONDAY
        );
        calendar.set(Calendar.HOUR_OF_DAY, 15);
        calendar.set(Calendar.MINUTE, 40);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);



        Timer time = new Timer(); // Instantiate Timer Object

        // Start running the task on Monday at 15:40:00, period is set to 8 hours
        // if you want to run the task immediately, set the 2nd parameter to 0
        time.schedule(new CustomTask(), calendar.getTime(), TimeUnit.HOURS.toMillis(8));
}

Access props inside quotes in React JSX

Best practices are to add getter method for that :

getImageURI() {
  return "images/" + this.props.image;
}

<img className="image" src={this.getImageURI()} />

Then , if you have more logic later on, you can maintain the code smoothly.

Parse XML document in C#

Try this:

XmlDocument doc = new XmlDocument();
doc.Load(@"C:\Path\To\Xml\File.xml");

Or alternatively if you have the XML in a string use the LoadXml method.

Once you have it loaded, you can use SelectNodes and SelectSingleNode to query specific values, for example:

XmlNode node = doc.SelectSingleNode("//Company/Email/text()");
// node.Value contains "[email protected]"

Finally, note that your XML is invalid as it doesn't contain a single root node. It must be something like this:

<Data>
    <Employee>
        <Name>Test</Name>
        <ID>123</ID>
    </Employee>
    <Company>
        <Name>ABC</Name>
        <Email>[email protected]</Email>
    </Company>
</Data>

AttributeError: 'module' object has no attribute 'urlretrieve'

As you're using Python 3, there is no urllib module anymore. It has been split into several modules.

This would be equivalent to urlretrieve:

import urllib.request
data = urllib.request.urlretrieve("http://...")

urlretrieve behaves exactly the same way as it did in Python 2.x, so it'll work just fine.

Basically:

urlretrieve saves the file to a temporary file and returns a tuple (filename, headers)
urlopen returns a Request object whose read method returns a bytestring containing the file contents

Weird behavior of the != XPath operator

The problem is that the 'and' is being treated as an 'or'.

No, the problem is that you are using the XPath != operator and you aren't aware of its "weird" semantics.

Solution:

Just replace the any x != y expressions with a not(x = y) expression.

In your specific case:

Replace:

<xsl:when test="$AccountNumber != '12345' and $Balance != '0'">

with:

<xsl:when test="not($AccountNumber = '12345') and not($Balance = '0')">

Explanation:

By definition whenever one of the operands of the != operator is a nodeset, then the result of evaluating this operator is true if there is a node in the node-set, whose value isn't equal to the other operand.

So:

 $someNodeSet != $someValue

generally doesn't produce the same result as:

 not($someNodeSet = $someValue)

The latter (by definition) is true exactly when there isn't a node in $someNodeSet whose string value is equal to $someValue.

Lesson to learn:

Never use the != operator, unless you are absolutely sure you know what you are doing.

How do I draw a shadow under a UIView?

I use this as part of my utils. With this we can not only set shadow but also can get a rounded corner for any UIView. Also you could set what color shadow you prefer. Normally black is preferred but sometimes, when the background is non-white you might want something else. Here's what I use -

in utils.m
+ (void)roundedLayer:(CALayer *)viewLayer 
              radius:(float)r 
              shadow:(BOOL)s
{
    [viewLayer setMasksToBounds:YES];
    [viewLayer setCornerRadius:r];        
    [viewLayer setBorderColor:[RGB(180, 180, 180) CGColor]];
    [viewLayer setBorderWidth:1.0f];
    if(s)
    {
        [viewLayer setShadowColor:[RGB(0, 0, 0) CGColor]];
        [viewLayer setShadowOffset:CGSizeMake(0, 0)];
        [viewLayer setShadowOpacity:1];
        [viewLayer setShadowRadius:2.0];
    }
    return;
}

To use this we need to call this - [utils roundedLayer:yourview.layer radius:5.0f shadow:YES];

Node.js fs.readdir recursive directory search

Another simple and helpful one

function walkDir(root) {
    const stat = fs.statSync(root);

    if (stat.isDirectory()) {
        const dirs = fs.readdirSync(root).filter(item => !item.startsWith('.'));
        let results = dirs.map(sub => walkDir(`${root}/${sub}`));
        return [].concat(...results);
    } else {
        return root;
    }
}

How do I set the proxy to be used by the JVM

As is pointed out in other answers, if you need to use Authenticated proxies, there's no reliable way to do this purely using command-line variables - which is annoying if you're using someone else's application and don't want to mess with the source code.

Will Iverson makes the helpful suggestion over at Using HttpProxy to connect to a host with preemtive authentication to use a Proxy-management tool such as Proxifier ( http://www.proxifier.com/ for Mac OS X and Windows) to handle this.

For example with Proxifier you can set it up to only intercept java commands to be managed and redirected through its (authenticated) proxy. You're going to want to set the proxyHost and proxyPort values to blank in this case though, e.g. pass in -Dhttp.proxyHost= -Dhttp.proxyPort= to your java commands.

How can I get the name of an html page in Javascript?

Current page: It's possible to do even shorter. This single line sound more elegant to find the current page's file name:

var fileName = location.href.split("/").slice(-1);

or...

var fileName = location.pathname.split("/").slice(-1)

This is cool to customize nav box's link, so the link toward the current is enlighten by a CSS class.

JS:

$('.menu a').each(function() {
    if ($(this).attr('href') == location.href.split("/").slice(-1)){ $(this).addClass('curent_page'); }
});

CSS:

a.current_page { font-size: 2em; color: red; }

How to simulate a mouse click using JavaScript?

JavaScript Code

   //this function is used to fire click event
    function eventFire(el, etype){
      if (el.fireEvent) {
        el.fireEvent('on' + etype);
      } else {
        var evObj = document.createEvent('Events');
        evObj.initEvent(etype, true, false);
        el.dispatchEvent(evObj);
      }
    }

function showPdf(){
  eventFire(document.getElementById('picToClick'), 'click');
}

HTML Code

<img id="picToClick" data-toggle="modal" data-target="#pdfModal" src="img/Adobe-icon.png" ng-hide="1===1">
  <button onclick="showPdf()">Click me</button>

Adding subscribers to a list using Mailchimp's API v3

These are good answers but detached from a full answer as to how you would get a form to send data and handle that response. This will demonstrate how to add a member to a list with v3.0 of the API from an HTML page via jquery .ajax().

In Mailchimp:

Acquire your API Key and List ID
Make sure you setup your list and what custom fields you want to use with it. In this case, I've set up zipcode as a custom field in the list BEFORE I did the API call.
Check out the API docs on adding members to lists. We are using the create method which requires the use of HTTP POST requests. There are other options in here that require PUT if you want to be able to modify/delete subs.

HTML:

<form id="pfb-signup-submission" method="post">
  <div class="sign-up-group">
    <input type="text" name="pfb-signup" id="pfb-signup-box-fname" class="pfb-signup-box" placeholder="First Name">
    <input type="text" name="pfb-signup" id="pfb-signup-box-lname" class="pfb-signup-box" placeholder="Last Name">
    <input type="email" name="pfb-signup" id="pfb-signup-box-email" class="pfb-signup-box" placeholder="[email protected]">
    <input type="text" name="pfb-signup" id="pfb-signup-box-zip" class="pfb-signup-box" placeholder="Zip Code">
  </div>
  <input type="submit" class="submit-button" value="Sign-up" id="pfb-signup-button"></a>
  <div id="pfb-signup-result"></div>
</form>

Key things:

Give your <form> a unique ID and don't forget the method="post" attribute so the form works.
Note the last line #signup-result is where you will deposit the feedback from the PHP script.

PHP:

<?php
  /*
   * Add a 'member' to a 'list' via mailchimp API v3.x
   * @ http://developer.mailchimp.com/documentation/mailchimp/reference/lists/members/#create-post_lists_list_id_members
   *
   * ================
   * BACKGROUND
   * Typical use case is that this code would get run by an .ajax() jQuery call or possibly a form action
   * The live data you need will get transferred via the global $_POST variable
   * That data must be put into an array with keys that match the mailchimp endpoints, check the above link for those
   * You also need to include your API key and list ID for this to work.
   * You'll just have to go get those and type them in here, see README.md
   * ================
   */

  // Set API Key and list ID to add a subscriber
  $api_key = 'your-api-key-here';
  $list_id = 'your-list-id-here';

  /* ================
   * DESTINATION URL
   * Note: your API URL has a location subdomain at the front of the URL string
   * It can vary depending on where you are in the world
   * To determine yours, check the last 3 digits of your API key
   * ================
   */
  $url = 'https://us5.api.mailchimp.com/3.0/lists/' . $list_id . '/members/';

  /* ================
   * DATA SETUP
   * Encode data into a format that the add subscriber mailchimp end point is looking for
   * Must include 'email_address' and 'status'
   * Statuses: pending = they get an email; subscribed = they don't get an email
   * Custom fields go into the 'merge_fields' as another array
   * More here: http://developer.mailchimp.com/documentation/mailchimp/reference/lists/members/#create-post_lists_list_id_members
   * ================
   */
  $pfb_data = array(
    'email_address' => $_POST['emailname'],
    'status'        => 'pending',
    'merge_fields'  => array(
      'FNAME'       => $_POST['firstname'],
      'LNAME'       => $_POST['lastname'],
      'ZIPCODE'     => $_POST['zipcode']
    ),
  );

  // Encode the data
  $encoded_pfb_data = json_encode($pfb_data);

  // Setup cURL sequence
  $ch = curl_init();

  /* ================
   * cURL OPTIONS
   * The tricky one here is the _USERPWD - this is how you transfer the API key over
   * _RETURNTRANSFER allows us to get the response into a variable which is nice
   * This example just POSTs, we don't edit/modify - just a simple add to a list
   * _POSTFIELDS does the heavy lifting
   * _SSL_VERIFYPEER should probably be set but I didn't do it here
   * ================
   */
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_USERPWD, 'user:' . $api_key);
  curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_TIMEOUT, 10);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $encoded_pfb_data);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

  $results = curl_exec($ch); // store response
  $response = curl_getinfo($ch, CURLINFO_HTTP_CODE); // get HTTP CODE
  $errors = curl_error($ch); // store errors

  curl_close($ch);

  // Returns info back to jQuery .ajax or just outputs onto the page

  $results = array(
    'results' => $result_info,
    'response' => $response,
    'errors' => $errors
  );

  // Sends data back to the page OR the ajax() in your JS
  echo json_encode($results);
?>

Key things:

CURLOPT_USERPWD handles the API key and Mailchimp doesn't really show you how to do this.
CURLOPT_RETURNTRANSFER gives us the response in such a way that we can send it back into the HTML page with the .ajax() success handler.
Use json_encodeon the data you received.

JS:

// Signup form submission
$('#pfb-signup-submission').submit(function(event) {
  event.preventDefault();

  // Get data from form and store it
  var pfbSignupFNAME = $('#pfb-signup-box-fname').val();
  var pfbSignupLNAME = $('#pfb-signup-box-lname').val();
  var pfbSignupEMAIL = $('#pfb-signup-box-email').val();
  var pfbSignupZIP = $('#pfb-signup-box-zip').val();

  // Create JSON variable of retreived data
  var pfbSignupData = {
    'firstname': pfbSignupFNAME,
    'lastname': pfbSignupLNAME,
    'email': pfbSignupEMAIL,
    'zipcode': pfbSignupZIP
  };

  // Send data to PHP script via .ajax() of jQuery
  $.ajax({
    type: 'POST',
    dataType: 'json',
    url: 'mailchimp-signup.php',
    data: pfbSignupData,
    success: function (results) {
      $('#pfb-signup-box-fname').hide();
      $('#pfb-signup-box-lname').hide();
      $('#pfb-signup-box-email').hide();
      $('#pfb-signup-box-zip').hide();
      $('#pfb-signup-result').text('Thanks for adding yourself to the email list. We will be in touch.');
      console.log(results);
    },
    error: function (results) {
      $('#pfb-signup-result').html('<p>Sorry but we were unable to add you into the email list.</p>');
      console.log(results);
    }
  });
});

Key things:

JSON data is VERY touchy on transfer. Here, I am putting it into an array and it looks easy. If you are having problems, it is likely because of how your JSON data is structured. Check this out!
The keys for your JSON data will become what you reference in the PHP _POST global variable. In this case it will be _POST['email'], _POST['firstname'], etc. But you could name them whatever you want - just remember what you name the keys of the data part of your JSON transfer is how you access them in PHP.
This obviously requires jQuery ;)

How to calculate number of days between two dates

If you are using moment.js you can do it easily.

var start = moment("2018-03-10", "YYYY-MM-DD");
var end = moment("2018-03-15", "YYYY-MM-DD");

//Difference in number of days
moment.duration(start.diff(end)).asDays();

//Difference in number of weeks
moment.duration(start.diff(end)).asWeeks();

If you want to find difference between a given date and current date in number of days (ignoring time), make sure to remove time from moment object of current date as below

moment().startOf('day')

To find difference between a given date and current date in number of days

var given = moment("2018-03-10", "YYYY-MM-DD");
var current = moment().startOf('day');

//Difference in number of days
moment.duration(given.diff(current)).asDays();

How to Diff between local uncommitted changes and origin

Given that the remote repository has been cached via git fetch it should be possible to compare against these commits. Try the following:

$ git fetch origin
$ git diff origin/master

"No backupset selected to be restored" SQL Server 2012

I have run into the same issue. Run SSMS as administrator then right click and do database restore. Should work.

Oracle "ORA-01008: not all variables bound" Error w/ Parameters

It seems daft, but I think when you use the same bind variable twice you have to set it twice:

cmd.Parameters.Add("VarA", "24");
cmd.Parameters.Add("VarB", "test");
cmd.Parameters.Add("VarB", "test");
cmd.Parameters.Add("VarC", "1234");
cmd.Parameters.Add("VarC", "1234");

Certainly that's true with Native Dynamic SQL in PL/SQL:

SQL> begin
  2     execute immediate 'select * from emp where ename=:name and ename=:name'
  3     using 'KING';
  4  end;
  5  /
begin
*
ERROR at line 1:
ORA-01008: not all variables bound


SQL> begin
  2     execute immediate 'select * from emp where ename=:name and ename=:name' 
  3     using 'KING', 'KING';
  4  end;
  5  /

PL/SQL procedure successfully completed.

How do you add an image?

Just to clarify the problem here - the error is in the following bit of code:

<xsl:attribute name="src">
    <xsl:copy-of select="/root/Image/node()"/>
</xsl:attribute>

The instruction xsl:copy-of takes a node or node-set and makes a copy of it - outputting a node or node-set. However an attribute cannot contain a node, only a textual value, so xsl:value-of would be a possible solution (as this returns the textual value of a node or nodeset).

A MUCH shorter solution (and perhaps more elegant) would be the following:

<img width="100" height="100" src="{/root/Image/node()}" class="CalloutRightPhoto"/>

The use of the {} in the attribute is called an Attribute Value Template, and can contain any XPATH expression.

Note, the same XPath can be used here as you have used in the xsl_copy-of as it knows to take the textual value when used in a Attribute Value Template.

How can I make robocopy silent in the command line except for progress?

A workaround, if you want it to be absolutely silent, is to redirect the output to a file (and optionally delete it later).

Robocopy src dest > output.log
del output.log

How to change the text color of first select option

You can do this by using CSS: JSFiddle

HTML:

<select>
    <option>Text 1</option>
    <option>Text 2</option>
    <option>Text 3</option>
</select>

CSS:

select option:first-child { color:red; }

Or if you absolutely need to use JavaScript (not adviced for this): JSFiddle

JavaScript:

$(function() {
    $("select option:first-child").addClass("highlight");
});

CSS:

.highlight { color:red; }

.Net: How do I find the .NET version?

If you open a command prompt and type the following two commands, all framework versions that are installed on the current machine will be listed (each one is stored in a separate directory within this directory).

cd %systemroot%\Microsoft.NET\Framework

dir /A:D

How to redirect user's browser URL to a different page in Nodejs?

If you are using Express, the cleanest complete answer is this

const express = require('express')
const app     = express()

app.get('*', (req, res) => {
  // REDIRECT goes here
  res.redirect('https://www.YOUR_URL.com/')
})

app.set('port', (process.env.PORT || 3000))
const server = app.listen(app.get('port'), () => {})

How can I debug a HTTP POST in Chrome?

You can filter for HTTP POST requests with the Chrome DevTools. Just do the following:

Open Chrome DevTools (Cmd+Opt+I on Mac, Ctrl+Shift+I or F12 on Windows) and click on the "Network" tab
Click on the "Filter" icon
Enter your filter method: method:POST
Select the request you want to debug
View the details of the request you want to debug

Screenshot

Tested with Chrome Version 53.

How to change collation of database, table, column?

Generates query to update each table and column of each table.

I have used this to some of my projects before and was able to solved most of my COLLATION problems. (especially on JOINS XD) Hope some of you find it useful.

To use, just export results to delimited text (probably new line '\n')

-- EACH TABLE
SELECT CONCAT('ALTER TABLE ', TABLE_NAME,' CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;') AS 'USE DATABASE_NAME;' FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'DATABASE_NAME' AND TABLE_TYPE LIKE 'BASE TABLE'

-- EACH COLUMN
SELECT CONCAT('ALTER TABLE ', TABLE_NAME,' MODIFY COLUMN ', COLUMN_NAME,' ', DATA_TYPE, IF(CHARACTER_MAXIMUM_LENGTH IS NULL OR DATA_TYPE LIKE 'longtext', '', CONCAT('(',CHARACTER_MAXIMUM_LENGTH,')')),' COLLATE utf8mb4_unicode_ci;') AS 'USE DATABASE_NAME;' FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'DATABASE_NAME' AND (SELECT INFORMATION_SCHEMA.TABLES.TABLE_TYPE FROM INFORMATION_SCHEMA.TABLES WHERE INFORMATION_SCHEMA.TABLES.TABLE_SCHEMA = INFORMATION_SCHEMA.COLUMNS.TABLE_SCHEMA AND INFORMATION_SCHEMA.TABLES.TABLE_NAME = INFORMATION_SCHEMA.COLUMNS.TABLE_NAME LIMIT 1) LIKE 'BASE TABLE' AND DATA_TYPE IN ('char','varchar') /* include other types if necessary */

How can Print Preview be called from Javascript?

It can be done using javascript. Say your html/aspx code goes this way:

<span>Main heading</span>
<asp:Label ID="lbl1" runat="server" Text="Contents"></asp:Label>
<asp:Label Text="Contractor Name" ID="lblCont" runat="server"></asp:Label>
<div id="forPrintPreview">
  <asp:Label Text="Company Name" runat="server"></asp:Label>
  <asp:GridView runat="server">

      //GridView Content goes here

  </asp:GridView
</div>

<input type="button" onclick="PrintPreview();" value="Print Preview" />

Here on click of "Print Preview" button we will open a window with data for print. Observe that 'forPrintPreview' is the id of a div. The function for Print preview goes this way:

function PrintPreview() {
 var Contractor= $('span[id*="lblCont"]').html();
 printWindow = window.open("", "", "location=1,status=1,scrollbars=1,width=650,height=600");
 printWindow.document.write('<html><head>');
 printWindow.document.write('<style type="text/css">@media print{.no-print, .no-print *{display: none !important;}</style>');
 printWindow.document.write('</head><body>');
 printWindow.document.write('<div style="width:100%;text-align:right">');

  //Print and cancel button
 printWindow.document.write('<input type="button" id="btnPrint" value="Print" class="no-print" style="width:100px" onclick="window.print()" />');
 printWindow.document.write('<input type="button" id="btnCancel" value="Cancel" class="no-print"  style="width:100px" onclick="window.close()" />');

 printWindow.document.write('</div>');

 //You can include any data this way.
 printWindow.document.write('<table><tr><td>Contractor name:'+ Contractor +'</td></tr>you can include any info here</table');

 printWindow.document.write(document.getElementById('forPrintPreview').innerHTML);
 //here 'forPrintPreview' is the id of the 'div' in current page(aspx).
 printWindow.document.write('</body></html>');
 printWindow.document.close();
 printWindow.focus();
}

Observe that buttons 'print' and 'cancel' has the css class 'no-print', So these buttons will not appear in the print.

adb server version doesn't match this client

If the device you're trying to interact with is a physical phone connected via USB, you can unplug it and plug it back and and it should work. Sometimes it just gets out of sync I think.

CSS: Hover one element, effect for multiple elements?

You'd need to use JavaScript to accomplish this, I think.

jQuery:

$(function(){
   $("#innerContainer").hover(
        function(){
            $("#innerContainer").css('border-color','#FFF');
            $("#outerContainer").css('border-color','#FFF');
        },
        function(){
            $("#innerContainer").css('border-color','#000');
            $("#outerContainer").css('border-color','#000');
        }
    );
});

Adjust the values and element id's accordingly :)

surface plots in matplotlib

You can read data direct from some file and plot

from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
from matplotlib import cm
import numpy as np
from sys import argv

x,y,z = np.loadtxt('your_file', unpack=True)

fig = plt.figure()
ax = Axes3D(fig)
surf = ax.plot_trisurf(x, y, z, cmap=cm.jet, linewidth=0.1)
fig.colorbar(surf, shrink=0.5, aspect=5)
plt.savefig('teste.pdf')
plt.show()

If necessary you can pass vmin and vmax to define the colorbar range, e.g.

surf = ax.plot_trisurf(x, y, z, cmap=cm.jet, linewidth=0.1, vmin=0, vmax=2000)

Bonus Section

I was wondering how to do some interactive plots, in this case with artificial data

from __future__ import print_function
from ipywidgets import interact, interactive, fixed, interact_manual
import ipywidgets as widgets
from IPython.display import Image

from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
from mpl_toolkits import mplot3d

def f(x, y):
    return np.sin(np.sqrt(x ** 2 + y ** 2))

def plot(i):

    fig = plt.figure()
    ax = plt.axes(projection='3d')

    theta = 2 * np.pi * np.random.random(1000)
    r = i * np.random.random(1000)
    x = np.ravel(r * np.sin(theta))
    y = np.ravel(r * np.cos(theta))
    z = f(x, y)

    ax.plot_trisurf(x, y, z, cmap='viridis', edgecolor='none')
    fig.tight_layout()

interactive_plot = interactive(plot, i=(2, 10))
interactive_plot

Loop structure inside gnuplot?

Use the following if you have discrete columns to plot in a graph

do for [indx in "2 3 7 8"] {
  column = indx + 0
  plot ifile using 1:column ;  
}

How to access data/data folder in Android device?

One of the simple way is to create your database on SD-Card. Because you cannot get access to your phone's data folder in internal memory, unless you root your phone. So why not simply create your database on SD-Card.

Moreover, if you want, you may write some file copying-code to copy your existing database file (from internal memory) to external memory without requiring any root.

How to test if a file is a directory in a batch script?

Under Windows 7 and XP, I can't get it to tell files vs. dirs on mapped drives. The following script:

@echo off
if exist c:\temp\data.csv echo data.csv is a file
if exist c:\temp\data.csv\ echo data.csv is a directory
if exist c:\temp\data.csv\nul echo data.csv is a directory
if exist k:\temp\nonexistent.txt echo nonexistent.txt is a file
if exist k:\temp\something.txt echo something.txt is a file
if exist k:\temp\something.txt\ echo something.txt is a directory
if exist k:\temp\something.txt\nul echo something.txt is a directory

produces:

data.csv is a file
something.txt is a file
something.txt is a directory
something.txt is a directory

So beware if your script might be fed a mapped or UNC path. The pushd solution below seems to be the most foolproof.

What's the best/easiest GUI Library for Ruby?

If you're looking for a cross-platform GUI, then I'd highly recommend going with JRuby and Swing.

Also, take a look at the monkeybars library, which is a Ruby library for building MVC applications using JRuby and Swing, where you can also use the excellent Netbeans IDE to visually build your GUI.

How to reset Android Studio

If you are using Windows and Android Studio 4 and above, the location to the directory is C:\Users(your name)\AppData\Roaming\Google\

Simple delete the Google folder to reset all settings. Open Android Studio and do not import settings when asked

How do you create a read-only user in PostgreSQL?

Grant usage/select to a single table

If you only grant CONNECT to a database, the user can connect but has no other privileges. You have to grant USAGE on namespaces (schemas) and SELECT on tables and views individually like so:

GRANT CONNECT ON DATABASE mydb TO xxx;
-- This assumes you're actually connected to mydb..
GRANT USAGE ON SCHEMA public TO xxx;
GRANT SELECT ON mytable TO xxx;

Multiple tables/views (PostgreSQL 9.0+)

In the latest versions of PostgreSQL, you can grant permissions on all tables/views/etc in the schema using a single command rather than having to type them one by one:

GRANT SELECT ON ALL TABLES IN SCHEMA public TO xxx;

This only affects tables that have already been created. More powerfully, you can automatically have default roles assigned to new objects in future:

ALTER DEFAULT PRIVILEGES IN SCHEMA public
   GRANT SELECT ON TABLES TO xxx;

Note that by default this will only affect objects (tables) created by the user that issued this command: although it can also be set on any role that the issuing user is a member of. However, you don't pick up default privileges for all roles you're a member of when creating new objects... so there's still some faffing around. If you adopt the approach that a database has an owning role, and schema changes are performed as that owning role, then you should assign default privileges to that owning role. IMHO this is all a bit confusing and you may need to experiment to come up with a functional workflow.

Multiple tables/views (PostgreSQL versions before 9.0)

To avoid errors in lengthy, multi-table changes, it is recommended to use the following 'automatic' process to generate the required GRANT SELECT to each table/view:

SELECT 'GRANT SELECT ON ' || relname || ' TO xxx;'
FROM pg_class JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace
WHERE nspname = 'public' AND relkind IN ('r', 'v', 'S');

This should output the relevant GRANT commands to GRANT SELECT on all tables, views, and sequences in public, for copy-n-paste love. Naturally, this will only be applied to tables that have already been created.

How to split a string in Java

import java.io.*;

public class BreakString {

  public static void main(String args[]) {

    String string = "004-034556-1234-2341";
    String[] parts = string.split("-");

    for(int i=0;i<parts.length;i++) {
      System.out.println(parts[i]);
    }
  }
}

PostgreSQL: export resulting data from SQL query to Excel/CSV

The correct script for postgres (Ubuntu) is:

COPY (SELECT * FROM tbl) TO '/var/lib/postgres/myfile1.csv';

Error - is not marked as serializable

Leaving my specific solution of this for prosperity, as it's a tricky version of this problem:

Type 'System.Linq.Enumerable+WhereSelectArrayIterator[T...] was not marked as serializable

Due to a class with an attribute IEnumerable<int> eg:

[Serializable]
class MySessionData{
    public int ID;
    public IEnumerable<int> RelatedIDs; //This can be an issue
}

Originally the problem instance of MySessionData was set from a non-serializable list:

MySessionData instance = new MySessionData(){ 
    ID = 123,
    RelatedIDs = nonSerizableList.Select<int>(item => item.ID)
};

The cause here is the concrete class that the Select<int>(...) returns, has type data that's not serializable, and you need to copy the id's to a fresh List<int> to resolve it.

RelatedIDs = nonSerizableList.Select<int>(item => item.ID).ToList();

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

put your script file in public directory then use(for example for userFunctions.js)

<script type="text/javascript" src="{{asset('js/userFunctions.js')}}">

How to pass a JSON array as a parameter in URL

You can pass your json Input as a POST request along with authorization header in this way

public static JSONObject getHttpConn(String json){
        JSONObject jsonObject=null;
        try {
            HttpPost httpPost=new HttpPost("http://google.com/");
            org.apache.http.client.HttpClient client = HttpClientBuilder.create().build();
            StringEntity stringEntity=new StringEntity("d="+json);

            httpPost.addHeader("content-type", "application/x-www-form-urlencoded");
            String authorization="test:test@123";
            String encodedAuth = "Basic " + Base64.encode(authorization.getBytes());        
            httpPost.addHeader("Authorization", security.get("Authorization"));
            httpPost.setEntity(stringEntity);
            HttpResponse reponse=client.execute(httpPost);
            InputStream inputStream=reponse.getEntity().getContent();
            String jsonResponse=IOUtils.toString(inputStream);
            jsonObject=JSONObject.fromObject(jsonResponse);
            } catch (UnsupportedEncodingException e) {

            e.printStackTrace();
        } catch (ClientProtocolException e) {

            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }
        return jsonObject;


    }

This Method will return a json response.In same way you can use GET method

HTML5 Audio stop function

I believe it would be good to check if the audio is playing state and reset the currentTime property.

if (sound.currentTime !== 0 && (sound.currentTime > 0 && sound.currentTime < sound.duration) {
    sound.currentTime = 0;
}
sound.play();

Resizing Images in VB.NET

Don't know much VB.NET syntax but here's and idea

Dim source As New Bitmap("C:\image.png") 
Dim target As New Bitmap(size.Width, size.Height, PixelFormat.Format24bppRgb)

Using graphics As Graphics = Graphics.FromImage(target)
    graphics.DrawImage(source, new Size(48, 48)) 
End Using

How to pass ArrayList<CustomeObject> from one activity to another?

You can pass an ArrayList<E> the same way, if the E type is Serializable.

You would call the putExtra (String name, Serializable value) of Intent to store, and getSerializableExtra (String name) for retrieval.

Example:

ArrayList<String> myList = new ArrayList<String>();
intent.putExtra("mylist", myList);

In the other Activity:

ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra("mylist");

Rendering HTML elements to <canvas>

Take a look on MDN

It will render html element using creating SVG images.

For Example: There is <em>I</em> like <span style="color:white; text-shadow:0 0 2px blue;">cheese</span> HTML element. And I want to add it into <canvas id="canvas" style="border:2px solid black;" width="200" height="200"></canvas> Canvas Element.

Here is Javascript Code to add HTML element to canvas.

_x000D_

var canvas = document.getElementById('canvas');_x000D_
var ctx = canvas.getContext('2d');_x000D_
_x000D_
var data = '<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">' +_x000D_
  '<foreignObject width="100%" height="100%">' +_x000D_
  '<div xmlns="http://www.w3.org/1999/xhtml" style="font-size:40px">' +_x000D_
  '<em>I</em> like <span style="color:white; text-shadow:0 0 2px blue;">cheese</span>' +_x000D_
  '</div>' +_x000D_
  '</foreignObject>' +_x000D_
  '</svg>';_x000D_
_x000D_
var DOMURL = window.URL || window.webkitURL || window;_x000D_
_x000D_
var img = new Image();_x000D_
var svg = new Blob([data], {_x000D_
  type: 'image/svg+xml;charset=utf-8'_x000D_
});_x000D_
var url = DOMURL.createObjectURL(svg);_x000D_
_x000D_
img.onload = function() {_x000D_
  ctx.drawImage(img, 0, 0);_x000D_
  DOMURL.revokeObjectURL(url);_x000D_
}_x000D_
_x000D_
img.src = url;

_x000D_

<canvas id="canvas" style="border:2px solid black;" width="200" height="200"></canvas>

_x000D_

How do I set session timeout of greater than 30 minutes

If you want to never expire a session use 0 or negative value -1.

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

or mention 1440 it indicates 1440 minutes [24hours * 60 minutes]

<session-config>
  <session-timeout>1440</session-timeout><!-- 24hours -->
</session-config>

Session will be expire after 24hours.

Hex transparency in colors

I built this small helper method for an android app, may come of use:

 /**
 * @param originalColor color, without alpha
 * @param alpha         from 0.0 to 1.0
 * @return
 */
public static String addAlpha(String originalColor, double alpha) {
    long alphaFixed = Math.round(alpha * 255);
    String alphaHex = Long.toHexString(alphaFixed);
    if (alphaHex.length() == 1) {
        alphaHex = "0" + alphaHex;
    }
    originalColor = originalColor.replace("#", "#" + alphaHex);


    return originalColor;
}

Google Chromecast sender error if Chromecast extension is not installed or using incognito

If you want to temporarily get rid of these console errors (like I did) you can install the extension here: https://chrome.google.com/webstore/detail/google-cast/boadgeojelhgndaghljhdicfkmllpafd/reviews?hl=en

I left a review asking for a fix. You can also do a bug report via the extension (after you install it) here. Instructions for doing so are here: https://support.google.com/chromecast/answer/3187017?hl=en

I hope Google gets on this. I need my console to show my errors, etc. Not theirs.

Efficient way of having a function only execute once in a loop

If the condition check needs to happen only once you are in the loop, having a flag signaling that you have already run the function helps. In this case you used a counter, a boolean variable would work just as fine.

signal = False
count = 0 
def callme(): 
     print "I am being called"  
while count < 2: 
     if signal == False : 
         callme()
         signal = True
     count +=1

How do you test to see if a double is equal to NaN?

The below code snippet will help evaluate primitive type holding NaN.

double dbl = Double.NaN; Double.valueOf(dbl).isNaN() ? true : false;

Can I embed a .png image into an html page?

Quick google search says you can embed it like this:

<img src="data:image/gif;base64,R0lGODlhEAAOALMAAOazToeHh0tLS/7LZv/0jvb29t/f3//Ub/
/ge8WSLf/rhf/3kdbW1mxsbP//mf///yH5BAAAAAAALAAAAAAQAA4AAARe8L1Ekyky67QZ1hLnjM5UUde0ECwLJoExKcpp
V0aCcGCmTIHEIUEqjgaORCMxIC6e0CcguWw6aFjsVMkkIr7g77ZKPJjPZqIyd7sJAgVGoEGv2xsBxqNgYPj/gAwXEQA7" 
width="16" height="14" alt="embedded folder icon">

But you need a different implementation in Internet Explorer.

http://www.websiteoptimization.com/speed/tweak/inline-images/

Comparing two files in linux terminal

Try sdiff (man sdiff)

sdiff -s file1 file2

When to use a linked list over an array/array list?

To add to the other answers, most array list implementations reserve extra capacity at the end of the list so that new elements can be added to the end of the list in O(1) time. When the capacity of an array list is exceeded, a new, larger array is allocated internally, and all the old elements are copied over. Usually, the new array is double the size of the old one. This means that on average, adding new elements to the end of an array list is an O(1) operation in these implementations. So even if you don't know the number of elements in advance, an array list may still be faster than a linked list for adding elements, as long as you are adding them at the end. Obviously, inserting new elements at arbitrary locations in an array list is still an O(n) operation.

Accessing elements in an array list is also faster than a linked list, even if the accesses are sequential. This is because array elements are stored in contiguous memory and can be cached easily. Linked list nodes can potentially be scattered over many different pages.

I would recommend only using a linked list if you know that you're going to be inserting or deleting items at arbitrary locations. Array lists will be faster for pretty much everything else.

jQuery click events not working in iOS

You should bind the tap event, the click does not exist on mobile safari or in the UIWbview. You can also use this polyfill ,to avoid the 300ms delay when a link is touched.

Mean per group in a data.frame

This type of operation is exactly what aggregate was designed for:

d <- read.table(text=
'Name     Month  Rate1     Rate2
Aira       1      12        23
Aira       2      18        73
Aira       3      19        45
Ben        1      53        19
Ben        2      22        87
Ben        3      19        45
Cat        1      22        87
Cat        2      67        43
Cat        3      45        32', header=TRUE)

aggregate(d[, 3:4], list(d$Name), mean)

  Group.1    Rate1    Rate2
1    Aira 16.33333 47.00000
2     Ben 31.33333 50.33333
3     Cat 44.66667 54.00000

Here we aggregate columns 3 and 4 of data.frame d, grouping by d$Name, and applying the mean function.

Or, using a formula interface:

aggregate(. ~ Name, d[-2], mean)

changing minDate option in JQuery DatePicker not working

Say we have two date select fields, field1, and field2. field2 date depends on field1

$('#field2').datepicker();
$('#field1').datepicker({
  onSelect: function(dateText, inst) {
    $('#field2').val("");
    $('#field2').datepicker("option", "minDate", new Date(dateText));
  }
});

Are arrays passed by value or passed by reference in Java?

No that is wrong. Arrays are special objects in Java. So it is like passing other objects where you pass the value of the reference, but not the reference itself. Meaning, changing the reference of an array in the called routine will not be reflected in the calling routine.

How to negate code in "if" statement block in JavaScript -JQuery like 'if not then..'

Try negation operator ! before $(this):

if (!$(this).parent().next().is('ul')){

How do I return the response from an asynchronous call?

Using Promise

The most perfect answer to this question is using Promise.

function ajax(method, url, params) {
  return new Promise(function(resolve, reject) {
    var xhr = new XMLHttpRequest();
    xhr.onload = function() {
      resolve(this.responseText);
    };
    xhr.onerror = reject;
    xhr.open(method, url);
    xhr.send(params);
  });
}

Usage

ajax("GET", "/test", "acrive=1").then(function(result) {
    // Code depending on result
})
.catch(function() {
    // An error occurred
});

But wait...!

There is a problem with using promises!

Why should we use our own custom Promise?

I was using this solution for a while until I figured out there is an error in old browsers:

Uncaught ReferenceError: Promise is not defined

So i decided to implement my own Promise class for ES3 to below js compilers if its not defined. Just add this code before your main code and then safely use Promise!

if(typeof Promise === "undefined"){
    function _classCallCheck(instance, Constructor) {
        if (!(instance instanceof Constructor)) { 
            throw new TypeError("Cannot call a class as a function"); 
        }
    }
    var Promise = function () {
        function Promise(main) {
            var _this = this;
            _classCallCheck(this, Promise);
            this.value = undefined;
            this.callbacks = [];
            var resolve = function resolve(resolveValue) {
                _this.value = resolveValue;
                _this.triggerCallbacks();
            };
            var reject = function reject(rejectValue) {
                _this.value = rejectValue;
                _this.triggerCallbacks();
            };
            main(resolve, reject);
        }
        Promise.prototype.then = function then(cb) {
            var _this2 = this;
            var next = new Promise(function (resolve) {
                _this2.callbacks.push(function (x) {
                    return resolve(cb(x));
                });
            });
            return next;
        };
        Promise.prototype.catch = function catch_(cb) {
            var _this2 = this;
            var next = new Promise(function (reject) {
                _this2.callbacks.push(function (x) {
                    return reject(cb(x));
                });
            });
            return next;
        };
        Promise.prototype.triggerCallbacks = function triggerCallbacks() {
            var _this3 = this;
            this.callbacks.forEach(function (cb) {
                cb(_this3.value);
            });
        };
        return Promise;
    }();
}

Turning off eslint rule for a specific line

single line comment did not work for me inside a react dumb functional component, I have used file level disabling by adding /* eslint-disable insertEslintErrorDefinitionHere */

(normally if you are using vs code and getting eslint error, you can click on the line which gives error and a bulb would show up in vs code, right click on the light bulb and choose any disable option and vs code will do it for you.)

When to catch java.lang.Error?

ideally we should never catch Error in our Java application as it is an abnormal condition. The application would be in abnormal state and could result in carshing or giving some seriously wrong result.

How does Content Security Policy (CSP) work?

The Content-Security-Policy meta-tag allows you to reduce the risk of XSS attacks by allowing you to define where resources can be loaded from, preventing browsers from loading data from any other locations. This makes it harder for an attacker to inject malicious code into your site.

I banged my head against a brick wall trying to figure out why I was getting CSP errors one after another, and there didn't seem to be any concise, clear instructions on just how does it work. So here's my attempt at explaining some points of CSP briefly, mostly concentrating on the things I found hard to solve.

For brevity I won’t write the full tag in each sample. Instead I'll only show the content property, so a sample that says content="default-src 'self'" means this:

<meta http-equiv="Content-Security-Policy" content="default-src 'self'">

1. How can I allow multiple sources?

You can simply list your sources after a directive as a space-separated list:

content="default-src 'self' https://example.com/js/"

Note that there are no quotes around parameters other than the special ones, like 'self'. Also, there's no colon (:) after the directive. Just the directive, then a space-separated list of parameters.

Everything below the specified parameters is implicitly allowed. That means that in the example above these would be valid sources:

https://example.com/js/file.js
https://example.com/js/subdir/anotherfile.js

These, however, would not be valid:

http://example.com/js/file.js
^^^^ wrong protocol

https://example.com/file.js
                   ^^ above the specified path

2. How can I use different directives? What do they each do?

The most common directives are:

default-src the default policy for loading javascript, images, CSS, fonts, AJAX requests, etc
script-src defines valid sources for javascript files
style-src defines valid sources for css files
img-src defines valid sources for images
connect-src defines valid targets for to XMLHttpRequest (AJAX), WebSockets or EventSource. If a connection attempt is made to a host that's not allowed here, the browser will emulate a 400 error

There are others, but these are the ones you're most likely to need.

3. How can I use multiple directives?

You define all your directives inside one meta-tag by terminating them with a semicolon (;):

content="default-src 'self' https://example.com/js/; style-src 'self'"

4. How can I handle ports?

Everything but the default ports needs to be allowed explicitly by adding the port number or an asterisk after the allowed domain:

content="default-src 'self' https://ajax.googleapis.com http://example.com:123/free/stuff/"

The above would result in:

https://ajax.googleapis.com:123
                           ^^^^ Not ok, wrong port

https://ajax.googleapis.com - OK

http://example.com/free/stuff/file.js
                 ^^ Not ok, only the port 123 is allowed

http://example.com:123/free/stuff/file.js - OK

As I mentioned, you can also use an asterisk to explicitly allow all ports:

content="default-src example.com:*"

5. How can I handle different protocols?

By default, only standard protocols are allowed. For example to allow WebSockets ws:// you will have to allow it explicitly:

content="default-src 'self'; connect-src ws:; style-src 'self'"
                                         ^^^ web Sockets are now allowed on all domains and ports.

6. How can I allow the file protocol file://?

If you'll try to define it as such it won’t work. Instead, you'll allow it with the filesystem parameter:

content="default-src filesystem"

7. How can I use inline scripts and style definitions?

Unless explicitly allowed, you can't use inline style definitions, code inside <script> tags or in tag properties like onclick. You allow them like so:

content="script-src 'unsafe-inline'; style-src 'unsafe-inline'"

You'll also have to explicitly allow inline, base64 encoded images:

content="img-src data:"

8. How can I allow eval()?

I'm sure many people would say that you don't, since 'eval is evil' and the most likely cause for the impending end of the world. Those people would be wrong. Sure, you can definitely punch major holes into your site's security with eval, but it has perfectly valid use cases. You just have to be smart about using it. You allow it like so:

content="script-src 'unsafe-eval'"

9. What exactly does 'self' mean?

You might take 'self' to mean localhost, local filesystem, or anything on the same host. It doesn't mean any of those. It means sources that have the same scheme (protocol), same host, and same port as the file the content policy is defined in. Serving your site over HTTP? No https for you then, unless you define it explicitly.

I've used 'self' in most examples as it usually makes sense to include it, but it's by no means mandatory. Leave it out if you don't need it.

But hang on a minute! Can't I just use content="default-src *" and be done with it?

No. In addition to the obvious security vulnerabilities, this also won’t work as you'd expect. Even though some docs claim it allows anything, that's not true. It doesn't allow inlining or evals, so to really, really make your site extra vulnerable, you would use this:

content="default-src * 'unsafe-inline' 'unsafe-eval'"

... but I trust you won’t.

Further reading:

http://content-security-policy.com

http://en.wikipedia.org/wiki/Content_Security_Policy

Python Sets vs Lists

I was interested in the results when checking, with CPython, if a value is one of a small number of literals. set wins in Python 3 vs tuple, list and or:

from timeit import timeit

def in_test1():
  for i in range(1000):
    if i in (314, 628):
      pass

def in_test2():
  for i in range(1000):
    if i in [314, 628]:
      pass

def in_test3():
  for i in range(1000):
    if i in {314, 628}:
      pass

def in_test4():
  for i in range(1000):
    if i == 314 or i == 628:
      pass

print("tuple")
print(timeit("in_test1()", setup="from __main__ import in_test1", number=100000))
print("list")
print(timeit("in_test2()", setup="from __main__ import in_test2", number=100000))
print("set")
print(timeit("in_test3()", setup="from __main__ import in_test3", number=100000))
print("or")
print(timeit("in_test4()", setup="from __main__ import in_test4", number=100000))

Output:

tuple
4.735646052286029
list
4.7308746771886945
set
3.5755991376936436
or
4.687681658193469

For 3 to 5 literals, set still wins by a wide margin, and or becomes the slowest.

In Python 2, set is always the slowest. or is the fastest for 2 to 3 literals, and tuple and list are faster with 4 or more literals. I couldn't distinguish the speed of tuple vs list.

When the values to test were cached in a global variable out of the function, rather than creating the literal within the loop, set won every time, even in Python 2.

These results apply to 64-bit CPython on a Core i7.

What is a magic number, and why is it bad?

A magic number is a sequence of characters at the start of a file format, or protocol exchange. This number serves as a sanity check.

Example: Open up any GIF file, you will see at the very start: GIF89. "GIF89" being the magic number.

Other programs can read the first few characters of a file and properly identify GIFs.

The danger is that random binary data can contain these same characters. But it is very unlikely.

As for protocol exchange, you can use it to quickly identify that the current 'message' that is being passed to you is corrupted or not valid.

Magic numbers are still useful.

how to use a like with a join in sql?

In MySQL you could try:

SELECT * FROM A INNER JOIN B ON B.MYCOL LIKE CONCAT('%', A.MYCOL, '%');

Of course this would be a massively inefficient query because it would do a full table scan.

Update: Here's a proof


create table A (MYCOL varchar(255));
create table B (MYCOL varchar(255));
insert into A (MYCOL) values ('foo'), ('bar'), ('baz');
insert into B (MYCOL) values ('fooblah'), ('somethingfooblah'), ('foo');
insert into B (MYCOL) values ('barblah'), ('somethingbarblah'), ('bar');
SELECT * FROM A INNER JOIN B ON B.MYCOL LIKE CONCAT('%', A.MYCOL, '%');
+-------+------------------+
| MYCOL | MYCOL            |
+-------+------------------+
| foo   | fooblah          |
| foo   | somethingfooblah |
| foo   | foo              |
| bar   | barblah          |
| bar   | somethingbarblah |
| bar   | bar              |
+-------+------------------+
6 rows in set (0.38 sec)

"Incorrect string value" when trying to insert UTF-8 into MySQL via JDBC?

I you only want to apply the change only for one field, you could try serializing the field

class MyModel < ActiveRecord::Base
  serialize :content

  attr_accessible :content, :title
end

How to remove leading zeros from alphanumeric text?

A clear way without any need of regExp and any external libraries.

public static String trimLeadingZeros(String source) {
    for (int i = 0; i < source.length(); ++i) {
        char c = source.charAt(i);
        if (c != '0') {
            return source.substring(i);
        }
    }
    return ""; // or return "0";
}

I am getting Failed to load resource: net::ERR_BLOCKED_BY_CLIENT with Google chrome

If you are running multiple extensions that perform ad or script blocking you will need to

individually update each one to your whitelist

Taking from this source, here are some of the extensions that may cause the case and how to deal with them.

Adblock Plus

Click the Adblock Plus icon.
Click “Enabled on this site” to disable ad blocking for the current site.
In Firefox Click “disable on wired.com” to disable ad blocking.
Reload the page you were viewing.
If problem still persist, cek if the character string "-300x600" is in the file name, that particular text pattern matches an expression list pattern in the AdBlock Plus.

Firefox Tracking Protection

In Firefox “Tracking Protection” may activate our adblock notice. It can be temporarily disabled for a browsing session by clicking the “shield” icon in the url bar if visible and following the instructions.
For further details on Tracking Protection please review Mozilla’s support.

Adblock

Click the Ad Block icon.
Click “Don’t run on pages on this domain”.
Reload the page you were viewing.

Ghostery

Click the Ghostery icon.
In Ghostery versions < 6.0 Click “Whitelist site”.
In Ghostery version 7.0 click “trust site”
In Versions < 6.0 You will see the message “Site is whitelisted”. Click “reload the page to see your changes.”
Reload the page you were viewing.

uBlock / uBlock Origin

Click the uBlock / uBlock Origin icon.
Click the “power” button in the menu that appears to whitelist the current web site.
Click the reload icon to reload the page you were viewing.

Disconnect

Click the Disconnect icon.
Click “Whitelist site”.

Kaspersky Ant-Banner
Please review How to configure Anti-Banner in Kaspersky Total Security for information on how to whitelist with Kaspersky Total Security.

How to place a text next to the picture?

How to remove decimal values from a value of type 'double' in Java

You can convert double,float variables to integer in a single line of code using explicit type casting.

float x = 3.05
int y = (int) x;
System.out.println(y);

The output will be 3

What is the difference between ndarray and array in numpy?

numpy.array is a function that returns a numpy.ndarray. There is no object type numpy.array.

Determine the number of rows in a range

I am sure that you probably wanted the answer that @GSerg gave. There is also a worksheet function called rows that will give you the number of rows.

So, if you have a named data range called Data that has 7 rows, then =ROWS(Data) will show 7 in that cell.

What is the difference between method overloading and overriding?

Method overriding is when a child class redefines the same method as a parent class, with the same parameters. For example, the standard Java class java.util.LinkedHashSet extends java.util.HashSet. The method add() is overridden in LinkedHashSet. If you have a variable that is of type HashSet, and you call its add() method, it will call the appropriate implementation of add(), based on whether it is a HashSet or a LinkedHashSet. This is called polymorphism.

Method overloading is defining several methods in the same class, that accept different numbers and types of parameters. In this case, the actual method called is decided at compile-time, based on the number and types of arguments. For instance, the method System.out.println() is overloaded, so that you can pass ints as well as Strings, and it will call a different version of the method.

UITableView with fixed section headers

to make UITableView sections header not sticky or sticky:

change the table view's style - make it grouped for not sticky & make it plain for sticky section headers - do not forget: you can do it from storyboard without writing code. (click on your table view and change it is style from the right Side/ component menu)
if you have extra components such as custom views or etc. please check the table view's margins to create appropriate design. (such as height of header for sections & height of cell at index path, sections)

why is plotting with Matplotlib so slow?

This may not apply to many of you, but I'm usually operating my computers under Linux, so by default I save my matplotlib plots as PNG and SVG. This works fine under Linux but is unbearably slow on my Windows 7 installations [MiKTeX under Python(x,y) or Anaconda], so I've taken to adding this code, and things work fine over there again:

import platform     # Don't save as SVG if running under Windows.
#
# Plot code goes here.
#
fig.savefig('figure_name.png', dpi = 200)
if platform.system() != 'Windows':
    # In my installations of Windows 7, it takes an inordinate amount of time to save
    # graphs as .svg files, so on that platform I've disabled the call that does so.
    # The first run of a script is still a little slow while everything is loaded in,
    # but execution times of subsequent runs are improved immensely.
    fig.savefig('figure_name.svg')

What's the difference between Instant and LocalDateTime?

You are wrong about LocalDateTime: it does not store any time-zone information and it has nanosecond precision. Quoting the Javadoc (emphasis mine):

A date-time without a time-zone in the ISO-8601 calendar system, such as 2007-12-03T10:15:30.

LocalDateTime is an immutable date-time object that represents a date-time, often viewed as year-month-day-hour-minute-second. Other date and time fields, such as day-of-year, day-of-week and week-of-year, can also be accessed. Time is represented to nanosecond precision. For example, the value "2nd October 2007 at 13:45.30.123456789" can be stored in a LocalDateTime.

The difference between the two is that Instant represents an offset from the Epoch (01-01-1970) and, as such, represents a particular instant on the time-line. Two Instant objects created at the same moment in two different places of the Earth will have exactly the same value.

Django values_list vs values

The values() method returns a QuerySet containing dictionaries:

<QuerySet [{'comment_id': 1}, {'comment_id': 2}]>

The values_list() method returns a QuerySet containing tuples:

<QuerySet [(1,), (2,)]>

If you are using values_list() with a single field, you can use flat=True to return a QuerySet of single values instead of 1-tuples:

<QuerySet [1, 2]>

How to clear all input fields in a specific div with jQuery?

For some who wants to reset the form can also use type="reset" inside any form.

<form action="/action_page.php">
Email: <input type="text" name="email"><br>
Pin: <input type="text" name="pin" maxlength="4"><br>
<input type="reset" value="Reset">
<input type="submit" value="Submit">
</form>

Referencing Row Number in R

This is probably the simplest way:

data$rownumber = 1:dim(data)[1]

It's probably worth noting that if you want to select a row by its row index, you can do this with simple bracket notation

data[3,]

vs.

data[data$rownumber==3,]

So I'm not really sure what this new column accomplishes.

How to extract a string using JavaScript Regex?

function extractSummary(iCalContent) {
  var rx = /\nSUMMARY:(.*)\n/g;
  var arr = rx.exec(iCalContent);
  return arr[1]; 
}

You need these changes:

Put the * inside the parenthesis as suggested above. Otherwise your matching group will contain only one character.
Get rid of the ^ and $. With the global option they match on start and end of the full string, rather than on start and end of lines. Match on explicit newlines instead.
I suppose you want the matching group (what's inside the parenthesis) rather than the full array? arr[0] is the full match ("\nSUMMARY:...") and the next indexes contain the group matches.
String.match(regexp) is supposed to return an array with the matches. In my browser it doesn't (Safari on Mac returns only the full match, not the groups), but Regexp.exec(string) works.

Killing a process created with Python's subprocess.Popen()

process.terminate() doesn't work when using shell=True. This answer will help you.

get data from mysql database to use in javascript

To do with javascript you could do something like this:

<script type="Text/javascript">
var text = <?= $text_from_db; ?>
</script>

Then you can use whatever you want in your javascript to put the text var into the textbox.

Correct way to write loops for promise.

Here's how I do it with the standard Promise object.

// Given async function sayHi
function sayHi() {
  return new Promise((resolve) => {
    setTimeout(() => {
      console.log('Hi');
      resolve();
    }, 3000);
  });
}

// And an array of async functions to loop through
const asyncArray = [sayHi, sayHi, sayHi];

// We create the start of a promise chain
let chain = Promise.resolve();

// And append each function in the array to the promise chain
for (const func of asyncArray) {
  chain = chain.then(func);
}

// Output:
// Hi
// Hi (After 3 seconds)
// Hi (After 3 more seconds)

How to disable anchor "jump" when loading a page?

See my answer here: Stackoverflow Answer

The trick is to just remove the hashtag ASAP and store its value for your own use:

It is important that you do not put that part of the code in the $() or $(window).load() functions as it would be too late and the browser already has moved to the tag.

// store the hash (DON'T put this code inside the $() function, it has to be executed 
// right away before the browser can start scrolling!
var target = window.location.hash,
    target = target.replace('#', '');

// delete hash so the page won't scroll to it
window.location.hash = "";

// now whenever you are ready do whatever you want
// (in this case I use jQuery to scroll to the tag after the page has loaded)
$(window).on('load', function() {
    if (target) {
        $('html, body').animate({
            scrollTop: $("#" + target).offset().top
        }, 700, 'swing', function () {});
    }
});

Check if a specific value exists at a specific key in any subarray of a multidimensional array

I came upon this post looking to do the same and came up with my own solution I wanted to offer for future visitors of this page (and to see if doing this way presents any problems I had not forseen).

If you want to get a simple true or false output and want to do this with one line of code without a function or a loop you could serialize the array and then use stripos to search for the value:

stripos(serialize($my_array),$needle)

It seems to work for me.

Apache Name Virtual Host with SSL

You MUST add below part to enable NameVirtualHost functionality with given IP.

NameVirtualHost IP_Address:443

How to install and use "make" in Windows?

GNU make is available on chocolatey.

Install chocolatey from here.
Then, choco install make.

Now you will be able to use Make on windows.
I've tried using it on MinGW, but it should work on CMD as well.

How to append text to an existing file in Java?

java 7+

In my humble opinion since I am fan of plain java, I would suggest something that it is a combination of the aforementioned answers. Maybe I am late for the party. Here is the code:

 String sampleText = "test" +  System.getProperty("line.separator");
 Files.write(Paths.get(filePath), sampleText.getBytes(StandardCharsets.UTF_8), 
 StandardOpenOption.CREATE, StandardOpenOption.APPEND);

If the file doesn't exist, it creates it and if already exists it appends the sampleText to the existing file. Using this, saves you from adding unnecessary libs to your classpath.

What is "String args[]"? parameter in main method Java

In addition to all the previous comments.

public static void main(String[] args)

can be written as

 public static void main(String...arg)

 public static void main(String...strings)

How to start new activity on button click

The way to start new activities is to broadcast an intent, and there is a specific kind of intent that you can use to pass data from one activity to another. My recommendation is that you check out the Android developer docs related to intents; it's a wealth of info on the subject, and has examples too.

How to open specific tab of bootstrap nav tabs on click of a particuler link using jQuery?

You may access through tab Id as well, But that id is unique for same page. Here is an example for same

$('#product_detail').tab('show');

In above example #product_details is nav tab id

How to use a variable for the database name in T-SQL?

Put the entire script into a template string, with {SERVERNAME} placeholders. Then edit the string using:

SET @SQL_SCRIPT = REPLACE(@TEMPLATE, '{SERVERNAME}', @DBNAME)

and then run it with

EXECUTE (@SQL_SCRIPT)

It's hard to believe that, in the course of three years, nobody noticed that my code doesn't work!

You can't EXEC multiple batches. GO is a batch separator, not a T-SQL statement. It's necessary to build three separate strings, and then to EXEC each one after substitution.

I suppose one could do something "clever" by breaking the single template string into multiple rows by splitting on GO; I've done that in ADO.NET code.

And where did I get the word "SERVERNAME" from?

Here's some code that I just tested (and which works):

DECLARE @DBNAME VARCHAR(255)
SET @DBNAME = 'TestDB'

DECLARE @CREATE_TEMPLATE VARCHAR(MAX)
DECLARE @COMPAT_TEMPLATE VARCHAR(MAX)
DECLARE @RECOVERY_TEMPLATE VARCHAR(MAX)

SET @CREATE_TEMPLATE = 'CREATE DATABASE {DBNAME}'
SET @COMPAT_TEMPLATE='ALTER DATABASE {DBNAME} SET COMPATIBILITY_LEVEL = 90'
SET @RECOVERY_TEMPLATE='ALTER DATABASE {DBNAME} SET RECOVERY SIMPLE'

DECLARE @SQL_SCRIPT VARCHAR(MAX)

SET @SQL_SCRIPT = REPLACE(@CREATE_TEMPLATE, '{DBNAME}', @DBNAME)
EXECUTE (@SQL_SCRIPT)

SET @SQL_SCRIPT = REPLACE(@COMPAT_TEMPLATE, '{DBNAME}', @DBNAME)
EXECUTE (@SQL_SCRIPT)

SET @SQL_SCRIPT = REPLACE(@RECOVERY_TEMPLATE, '{DBNAME}', @DBNAME)
EXECUTE (@SQL_SCRIPT)

Increase JVM max heap size for Eclipse

--launcher.XXMaxPermSize

256m

Try to bump that value up!

List all indexes on ElasticSearch server?

curl -XGET 'http://localhost:9200/_cluster/health?level=indices'

This will output like below

{
  "cluster_name": "XXXXXX:name",
  "status": "green",
  "timed_out": false,
  "number_of_nodes": 3,
  "number_of_data_nodes": 3,
  "active_primary_shards": 199,
  "active_shards": 398,
  "relocating_shards": 0,
  "initializing_shards": 0,
  "unassigned_shards": 0,
  "delayed_unassigned_shards": 0,
  "number_of_pending_tasks": 0,
  "number_of_in_flight_fetch": 0,
  "task_max_waiting_in_queue_millis": 0,
  "active_shards_percent_as_number": 100,
  "indices": {
    "logstash-2017.06.19": {
      "status": "green",
      "number_of_shards": 3,
      "number_of_replicas": 1,
      "active_primary_shards": 3,
      "active_shards": 6,
      "relocating_shards": 0,
      "initializing_shards": 0,
      "unassigned_shards": 0
    },
    "logstash-2017.06.18": {
      "status": "green",
      "number_of_shards": 3,
      "number_of_replicas": 1,
      "active_primary_shards": 3,
      "active_shards": 6,
      "relocating_shards": 0,
      "initializing_shards": 0,
      "unassigned_shards": 0
    }}

Algorithm to find all Latitude Longitude locations within a certain distance from a given Lat Lng location

You may convert latitude-longitude to UTM format which is metric format that may help you to calculate distances. Then you can easily decide if point falls into specific location.

How to iterate through a DataTable

The above examples are quite helpful. But, if we want to check if a particular row is having a particular value or not. If yes then delete and break and in case of no value found straight throw error. Below code works:

foreach (DataRow row in dtData.Rows)
        {
            if (row["Column_name"].ToString() == txtBox.Text)
            {
                // Getting the sequence number from the textbox.
                string strName1 = txtRowDeletion.Text;

                // Creating the SqlCommand object to access the stored procedure
                // used to get the data for the grid.
                string strDeleteData = "Sp_name";
                SqlCommand cmdDeleteData = new SqlCommand(strDeleteData, conn);
                cmdDeleteData.CommandType = System.Data.CommandType.StoredProcedure;

                // Running the query.
                conn.Open();
                cmdDeleteData.ExecuteNonQuery();
                conn.Close();

                GetData();

                dtData = (DataTable)Session["GetData"];
                BindGrid(dtData);

                lblMsgForDeletion.Text = "The row successfully deleted !!" + txtRowDeletion.Text;
                txtRowDeletion.Text = "";
                break;
            }
            else
            {
                lblMsgForDeletion.Text = "The row is not present ";
            }
        }

How do I copy a 2 Dimensional array in Java?

current = old ;

Assignment operations doesnot copy elements of one array to another. You are just making the current matrix refer to the old matrix. You need to do a member wise copy.

Can an abstract class have a constructor?

Abstract class can have a constructor though it cannot be instantiated. But the constructor defined in an abstract class can be used for instantiation of concrete class of this abstract class. Check JLS:

It is a compile-time error if an attempt is made to create an instance of an abstract class using a class instance creation expression.

A subclass of an abstract class that is not itself abstract may be instantiated, resulting in the execution of a constructor for the abstract class and, therefore, the execution of the field initializers for instance variables of that class.

How to set the margin or padding as percentage of height of parent container?

The fix is that yes, vertical padding and margin are relative to width, but top and bottom aren't.

So just place a div inside another, and in the inner div, use something like top:50% (remember position matters if it still doesn't work)

How do I break a string in YAML over multiple lines?

To concatenate long lines without whitespace, use double quotes and escape the newlines with backslashes:

key: "Loremipsumdolorsitamet,consecteturadipiscingelit,seddoeiusmodtemp\
  orincididuntutlaboreetdoloremagnaaliqua."

(Thanks @Tobia)

How do I make curl ignore the proxy?

Lame answer but: Remember to make sure no proxy is set in a ~/.curlrc file (...).

How to search for a string in cell array in MATLAB?

I guess the following code could do the trick:

strs = {'HA' 'KU' 'LA' 'MA' 'TATA'}
ind=find(ismember(strs,'KU'))

This returns

ans = 
     2

How to output a multiline string in Bash?

Here documents are often used for this purpose.

cat << EOF
usage: up [--level <n>| -n <levels>][--help][--version]

Report bugs to: 
up home page:
EOF

They are supported in all Bourne-derived shells including all versions of Bash.

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