Tutorial by Examples: b

A class decorator is just a function that takes the class as its only argument and returns it after doing something with it: function log<T>(target: T) { // Do something with target console.log(target); // Return target return target; } We can then apply ...

The regular composition works for unary functions. In the case of binary, we can define (f .: g) x y = f (g x y) -- which is also = f ((g x) y) = (f . g x) y -- by definition of (.) = (f .) (g x) y = ((f .) . g) x y Thus,...

Extensions can add new subscripts to an existing type. This example gets the character inside a String using the given index: 2.2 extension String { subscript(index: Int) -> Character { let newIndex = startIndex.advancedBy(index) return self[newIndex] } } var my...

Install webpack-dev-middleware via npm npm i -D webpack-dev-middleware webpack-hot-middleware Modify webpack.config.js Add webpack-hot-middleware/client to each items defined in "entry" Add new webpack.HotModuleReplacementPlugin() to "plugins" module.export...

Now that you have an object, it might be good to figure out what it is. You can use the Get-Member cmdlet to see what an object is and what it contains: Get-Item c:\windows | Get-Member This yields: TypeName: System.IO.DirectoryInfo Followed by a list of properties and methods the object ha...

The Range attribute can decorate any properties or public fields and specifies a range that a numerical field must fall between to be considered valid. [Range(minimumValue, maximumValue)] public int Property { get; set; } Additionally, it accepts an optional ErrorMessage property that can be us...

The [RegularExpression] attribute can decorate any properties or public fields and specifies a regular expression that must be matched for the property be considered valid. [RegularExpression(validationExpression)] public string Property { get; set; } Additionally, it accepts an optional ErrorM...

Meteor uses Cordova to package your application into a hybrid Mobile App. Once packaged, the App can be distributed like native Apps (through Apple App Store, Google Play Store, etc.) Add the target platform(s) to your Meteor project: meteor add-platform android meteor add-platform ios # Only...

The following technique allows you to add your content to an HTML element and center it both horizontally and vertically without worrying about its height or width. The outer container should have display: table; The inner container should have display: table-cell; should have vertical-al...

Create an input (or button, or anchor) html element and call button() method of jQuery UI. <script> $(function() { $( "#myButton" ).button(); }); </script> HTML <input type="button" value="A button" id="myButton">

Sometimes it happens that a file was being tracked by git, but in a later point in time was added to .gitignore, in order to stop tracking it. It's a very common scenario to forget to clean up such files before its addition to .gitignore. In this case, the old file will still be hanging around in th...

To list local branches that contain a specific commit or tag git branch --contains <commit> To list local and remote branches that contain a specific commit or tag git branch -a --contains <commit>

First, you have to request authorization of location services let locationManager = CLLocationManager() locationManager.delegate = self locationManager.requestWhenInUseAuthorization() // OR locationManager.requestAlwaysAuthorization() Then you can get all iBeacons' information inside didRange...

git log --pretty=oneline |wc -l

for k in `git branch -a | sed s/^..//`; do echo -e `git log -1 --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k --`\\t"$k";done | sort

class Example { void method(boolean error) { if (error) { Log.error("Error occurred!"); System.out.println("Error!"); } else { // Use braces since the other block uses braces. System.out.println("No error"); ...

.git/hooks/pre-commit #!/bin/sh if [ -s pom.xml ]; then echo "Running mvn verify" mvn clean verify if [ $? -ne 0 ]; then echo "Maven build failed" exit 1 fi fi

Types used in Sets and Dictionaries(key) must conform to Hashable protocol which inherits from Equatable protocol. Custom type conforming to Hashable protocol must implement A calculated property hashValue Define one of the equality operators i.e. == or !=. Following example implements Hasha...

Create a basic application with single view application template with swift as language Add SWRevealViewController.h and SWRevealViewController.m then click on Create Bridging Header button and add #import "SWRevealViewController.h" on the Bridging header Then select viewControll...

LINQ provides a method that makes it easy to create a collection filled with sequential numbers. For example, you can declare an array which contains the integers between 1 and 100. The Enumerable.Range method allows us to create sequence of integer numbers from a specified start position and a num...