Tutorial by Examples: u

When using a function as a constructor, it has a special this binding, which refers to the newly created object: function Cat(name) { this.name = name; this.sound = "Meow"; } var cat = new Cat("Tom"); // is a Cat object cat.sound; // Returns "Meow" var ca...

There are various ways to use colours in Processing since Processing is very flexible with colour formats. RGB and RGBA This is the standard RGB(A) notation and the default color mode. The first three colour values (red, green, blue) range from 0 to 255. For example, the below example is the colou...

import React, { Component } from 'react'; type Props = { posts: Array<Article>, dispatch: Function, children: ReactElement } class Posts extends Component { props: Props; render () { // rest of the code goes here } }

The reference to the outer class uses the class name and this public class OuterClass { public class InnerClass { public void method() { System.out.println("I can access my enclosing class: " + OuterClass.this); } } } You can access fields and ...

In Kotlin strings are compared with == operator which chect for their structural equality. val str1 = "Hello, World!" val str2 = "Hello," + " World!" println(str1 == str2) // Prints true Referential equality is checked with === operator. val str1 = ""&q...

Download Play! 1. Goto http://www.playframework.com/download and download latest Play! release (play-2.5.X.zip at the time of this writing). Unzip in a directory of your choice. We’ll refer to uncompressed folder directory as PLAY_HOME. Add PLAY_HOME folder to you PATH environment variable, so that...

You can make your plugin customizable by accepting options. $.fn.colourize = function(options) { // This is one method to support default options var style = $.extend({ color: "green", backgroundColor: "white" }, options); // Set the col...

While writing jQuery plugins is simple, we want to enclose our plugins in a local scope. This will avoid namespace conflicts as well as polluting the global namespace, on top of ensuring that jQuery is loaded before our plugin extends it. // Encapsulate our plugins in a local scope (function($) { ...

The async package provides functions for asynchronous code. Using the auto function you can define asynchronous relations between two or more functions: var async = require('async'); async.auto({ get_data: function(callback) { console.log('in get_data'); // async code to ...

func isValidEmail(email: String) -> Bool { let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}" let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx) return emailTest.evaluate(with: email) } or you could use String extensio...

Let's say that you have the following class: public class PersonInfo { public int ID { get; set; } [Display(Name = "First Name")] [Required(ErrorMessage = "Please enter your first name!")] public string FirstName{ get; set; } [Display(Name = "L...

In the file myConfig.groovy is the following content. message = 'Hello World!' aNumber=42 aBoolean=false aList=["apples", "grapes", "oranges"] Then in your main script you create a ConfigSlurper for your myConfig.groovy file which is really just another groovy sc...

public String getCitiesByCountry(String countryName) throws MalformedURLException, IOException { //Code to make a webservice HTTP request String responseString = ""; String outputString = ""; String wsURL = "http://www.webservicex.com/globalweather.asm...

Define a new visitor class by overriding some of the methods of ExpressionVisitor: class PrintingVisitor : ExpressionVisitor { protected override Expression VisitConstant(ConstantExpression node) { Console.WriteLine("Constant: {0}", node); return base.VisitConstant(...

Go to https://www.mozilla.org/firefox/new/. 1.Click on Download button. 2.An executable file will be downloaded. 3.Double click on the .exe file and click run. 4.Finish the setup. 5.Select the option of "Maintain shortcut on the desktop".

For iterating more than two lists simultaneously within list comprehension, one may use zip() as: >>> list_1 = [1, 2, 3 , 4] >>> list_2 = ['a', 'b', 'c', 'd'] >>> list_3 = ['6', '7', '8', '9'] # Two lists >>> [(i, j) for i, j in zip(list_1, list_2)] [(1, '...

The following tests range A2 to A7 for duplicate values. Remark: This example illustrates a possible solution as a first approach to a solution. It's faster to use an array than a range and one could use collections or dictionaries or xml methods to check for duplicates. Sub find_duplicates() ...

Where command line arguments are supported they can be read in via the get_command_argument intrinsic (introduced in the Fortran 2003 standard). The command_argument_count intrinsic provides a way to know the number of arguments provided at the command line. All command-line arguments are read in ...

Slightly counterintuitively (but also the only sane way to make it work), this: val dyn: Dynamic = ??? dyn.x(y) = z is equivalent to: dyn.selectDynamic("x").update(y, z) while dyn.x(y) is still dyn.applyDynamic("x")(y) It is important to be aware of this, or else...

Using a CASE statement, conditionally display an expression in the column based on values found in another column, a.k.a. “my kingdom for an OR”. In the example, the result is obtained when the status of the transaction is Pending Fulfillment or Partially Fulfilled: CASE DECODE( {status}, 'Pending ...