Tutorial by Examples: el

The following example uses Express to create an HTTP server listening on port 3000, which responds with "Hello, World!". Express is a commonly-used web framework that is useful for creating HTTP APIs. First, create a new folder, e.g. myApp. Go into myApp and make a new JavaScript file con...

<svg width="800px" height="600px"> <defs> <filter id="greyscale"> <feColorMatrix type="matrix" values="0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 ...

01. Underline Text :- Single/Double Line , Strike Through :- Single/Double Line Step 1 Select the Label and change the label type Plain to Attributed Step 2 Click the label text and Right click Step 3 Then click Font -> Show Fonts Step 4 Then font view will show up and click under...

? This gives you an introduction and overview of IPython's features. object? This lists all methods and fields of the object and its documentation (if it exists). object?? Same as above, provides even more detail about the object, in particular will try to find and display the source cod...

XE2 program CrossPlatformHelloWorld; uses FMX.Dialogs; {$R *.res} begin ShowMessage('Hello world!'); end. Most of the Delphi supported platforms (Win32/Win64/OSX32/Android32/iOS32/iOS64) also support a console so the WriteLn example fits them well. For the platforms that require...

The easiest way to write Processing code is to simply call a series of functions. Press the run button in the Processing editor, and Processing will run your code. Here's an example: size(200, 200); background(0, 0, 255); fill(0, 255, 0); ellipse(100, 100, 100, 100); This code creates a 200x2...

$ mkdir hello-world $ cd hello-world $ tns create hello-world --ng $ tns platform add android #You can only add ios on an OSX machine Then ensure you have a device connected or an emulator running (if you don't, the default emulator should start or an error will be raised. I would recommend ge...

Emacs's user interface uses terms that were coined early and can be unsettling to users used to a more modern terminology. Frame In Emacs, what is otherwise called a window (the area of the display used by a program) is called a frame. Emacs starts using one frame, though additional frames may b...

Sometimes it is desirable to evaluate a nullable expression in an if-else fashion. The elvis operator, ?:, can be used in Kotlin for such a situation. For instance: val value: String = data?.first() ?: "Nothing here." The expression above returns "Nothing here" if data?.firs...

Examples of numeric fields are given: AutoField An auto-incrementing integer generally used for primary keys. from django.db import models class MyModel(models.Model): pk = models.AutoField() Each model gets a primary key field (called id) by default. Therefore, it is not necessary t...

This is a specialized field, used to store binary data. It only accepts bytes. Data is base64 serialized upon storage. As this is storing binary data, this field cannot be used in a filter. from django.db import models class MyModel(models.Model): my_binary_data = models.BinaryField() ...

In real world, connection and server delays could occur, to simulate delays in development environment Meteor._sleepForMs(ms); could be used Meteor.publish('USER_DATA', function() { Meteor._sleepForMs(3000); // Simulate 3 seconds delay return Meteor.users.find({}); });

@Entity class Note { @Id Integer id; @Basic String note; @Transient String parsedNote; String readParsedNote() { if (parsedNote == null) { /* initialize from note */ } return parsedNote; } } If your class needs fields that should ...

For...Next Using the iterator variable as the index number is the fastest way to iterate the elements of an array: Dim items As Variant items = Array(0, 1, 2, 3) Dim index As Integer For index = LBound(items) To UBound(items) 'assumes value can be implicitly converted to a String: D...

TRUNCATE tableName; This will delete all the data and reset AUTO_INCREMENT index. It's much faster than DELETE FROM tableName on a huge dataset. It can be very useful during development/testing. When you truncate a table SQL server doesn't delete the data, it drops the table and recreates it, th...

perl -lane'print "$F[0] $F[-1]"' data.txt # prints the first and the last fields of a space delimited record CSV example: perl -F, -lane'print "$F[0] $F[-1]"' data.csv

I always think it is nice to have a very simple, self-contained example so that nothing is assumed when I am learning a new task. This answer is that for deleting UITableView rows. The project performs like this: This project is based on the UITableView example for Swift. Add the Code Create a ...

curl -XDELETE 'http://www.example.com:9200/myIndexName?pretty' output: { "acknowledged" : true } Reference Link: Here

If your application is going to run on different devices, it's going to need to render to different ViewPorts, based on the device size. You can deal with this in two ways: with javascript rules, or CSS media styles. If you've been using a MVC or MVVM library, such as Angular or Ember (or Blaze, for...

Now it's time to go through the Meteor Cordova Phonegap Integration documentation. Since that documentation was written, XCode and Yosemite have been released, which has caused some hiccups in installation. Here are the steps we had to go through to get Meteor compiled to an iOS device. Upgrade ...