Tutorial by Examples: r

Use defdelegate to define functions that delegate to functions of the same name defined in another module: defmodule Math do defdelegate pi, to: :math end iex> Math.pi 3.141592653589793

Inheritance the a fundamental mechanism of CSS by which the computed values of some properties of an element are applied to its' children. This is particularly useful when you want to set a global style to your elements rather than having to set said properties to each and every element in your mark...

Some properties are not automatically inherited from an element down to its' children. This is because those properties are typically desired to be unique to the element (or selection of elements) to which the property is applied to. Common such properties are margin, padding, background, display, e...

iex> :observer.start :ok :observer.start opens the GUI observer interface, showing you CPU breakdown, memory usage, and other information critical to understanding the usage patterns of your applications.

Hierarchy - LinearLayout(horizontal) - ImageView - LinearLayout(vertical) - TextView - TextView Code LinearLayout rootView = new LinearLayout(context); rootView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); rootView.s...

Simple item insertion can be done with Array.prototype.splice method: arr.splice(index, 0, item); More advanced variant with multiple arguments and chaining support: /* Syntax: array.insert(index, value1, value2, ..., valueN) */ Array.prototype.insert = function(index) { this.splice.a...

public class ExampleActivity extends Activity { private final static String EXAMPLE_ARG = "example_arg"; private int mArg; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layou...

With the appropriate storage backend running a new titan graph can be initialised via: graph = TitanFactory.open("config.properties"); Wehere config.properties defines several configurations relevant to the storage backend. Titan provides some sample configs in its downloadable package...

First, install socket.io module in node.js application. npm install socket.io --save Basic HTTP Setup The following example attaches socket.io to a plain node.js HTTP server listening on port 3000. var server = require('http').createServer(); var io = require('socket.io')(server); io.on(...

#!/usr/bin/env perl use strict; use warnings 'all'; use XML::Twig; my $twig = XML::Twig->parse( \*DATA ); #we can use the 'root' method to find the root of the XML. my $root = $twig->root; #first_child finds the first child element matching a value. my $title = $root->firs...

The first step is to import Platform from the 'react-native' package like so: import { Platform } from 'react-native' After you've done that, you can go ahead and access the OS type through Platform.OS allowing you to use it in conditional statements like const styles = StyleSheet.create({ h...

JasperReports Library JasperReports is a open source Java based reporting tool. The JasperReports Library can be downloaded from the Jaspersoft Community for the latest release. In recent releases the third-party jars in the lib folder are not distributed, they need to be download from public r...

Windows Phone 8.1 SDK requires Visual Studio. Either check "SDK" when installing Visual Studio or install the SDK directly here.

To initialize react-native init MyAwesomeProject To initialize with a specific version of React Native react-native init --version="0.36.0" MyAwesomeProject To Run for Android cd MyAwesomeProject react-native run-android To Run for iOS cd MyAwesomeProject react-native run-io...

Used to declare an object or function that is defined elsewhere (and that has external linkage). In general, it is used to declare an object or function to be used in a module that is not the one in which the corresponding object or function is defined: /* file1.c */ int foo = 2; /* Has externa...

Hints to the compiler that access to an object should be as fast as possible. Whether the compiler actually uses the hint is implementation-defined; it may simply treat it as equivalent to auto. The only property that is definitively different for all objects that are declared with register is that...

$ react-native start On latest version of React Native, no need to run the packager. It will run automatically. By default this starts the server at port 8081. To specify which port the server is on $ react-native start --port PORTNUMBER

The reduce method reduces the collection to a single value, passing the result of each iteration into the subsequent iteration. Please see reduce method. The reduce method loops through each item with a collection and produces new result to the next iteration. Each result from the last iteration ...

The <see> tag can be used to link to another class. It contains the cref member which should contain the name of the class that is to be referenced. Visual Studio will provide Intellsense when writing this tag and such references will be processed when renaming the referenced class, too. /// ...

You can use the System.IO.File.ReadAllText function to read the entire contents of a file into a string. string text = System.IO.File.ReadAllText(@"C:\MyFolder\MyTextFile.txt"); You can also read a file as an array of lines using the System.IO.File.ReadAllLines function: string[] line...