Tutorial by Examples: v

The JavaScript coding convention is to place the starting bracket of blocks on the same line of their declaration: if (...) { } function (a, b, ...) { } Instead of in the next line: if (...) { } function (a, b, ...) { } This has been adopted to avoid semicolon insertion ...

Since arrays are reference types, an array variable can be null. To declare a null array variable, you must declare it without a size: Dim array() As Integer Or Dim array As Integer() To check if an array is null, test to see if it Is Nothing: Dim array() As Integer If array Is Nothing Th...

Since arrays are reference types, it is possible to have multiple variables pointing to the same array object. Dim array1() As Integer = {1, 2, 3} Dim array2() As Integer = array1 array1(0) = 4 Console.WriteLine(String.Join(", ", array2)) ' Writes "4, 2, 3"

One of the most common obstacles using classes is finding the proper approach to handle private states. There are 4 common solutions for handling private states: Using Symbols Symbols are new primitive type introduced on in ES2015, as defined at MDN A symbol is a unique and immutable data typ...

You can use using in order to set an alias for a namespace or type. More detail can be found in here. Syntax: using <identifier> = <namespace-or-type-name>; Example: using NewType = Dictionary<string, Dictionary<string,int>>; NewType multiDictionary = new NewType(); /...

Directive code angular.module('myModule', []) .directive('myDirective', function() { return { template: '<div>{{greeting}} {{name}}!</div>', scope: { name: '=', greeting: '@' } }; }); The test describe('myDirective', function() ...

You can test for IndexedDB support in the current environment by checking for the presence of the window.indexedDB property: if (window.indexedDB) { // IndexedDB is available }

(defn print-some-items [[a b :as xs]] (println a) (println b) (println xs)) (print-some-items [2 3]) This example prints the output 2 3 [2 3] The argument is destructured and the items 2 and 3 are assigned to the symbols a and b. The original argument, the entire vector [2 ...

console.dir(object) displays an interactive list of the properties of the specified JavaScript object. The output is presented as a hierarchical listing with disclosure triangles that let you see the contents of child objects. var myObject = { "foo":{ "bar":"d...

CDate() CDate() converts something from any datatype to a Date datatype Sub CDateExamples() Dim sample As Date ' Converts a String representing a date and time to a Date sample = CDate("September 11, 2001 12:34") Debug.Print Format$(sample, "yyyy-mm-dd hh:nn:...

Generics became available with: .NET Framework 2.0 (and version 2.0 of the compact framework). Java in version 5. Common Lisp since it was standardised ...

Server Syntax var io = require('socket.io')(80); io.on('connection', function (mysocket) { //custom event called `private message` mysocket.on('private message', function (from, msg) { console.log('I received a private message by ', from, ' saying ', msg); }); //internal `di...

stri_paste(LETTERS,"-", 1:13) # [1] "A-1" "B-2" "C-3" "D-4" "E-5" "F-6" "G-7" "H-8" "I-9" "J-10" "K-11" "L-12" "M-13" # [14] "N-1" "...

You want to convert all elements in an array to some other form. For example, you have theUsers = [ {id: 1, username: 'john'} {id: 2, username: 'lexy'} {id: 3, username: 'pete'} ] and you want to have an array of usernames only, i.e. ['john', 'lexy', 'pete'] Method 1 - using .map ...

theUsers = [ {id: 1, username: 'john'} {id: 2, username: 'lexy'} {id: 3, username: 'pete'} ] To retain only users whose id is greather than 2, use the following: [{id: 3, username: 'pete'}] Method 1 - using .filter filteredUsers = theUsers.filter (user) -> user.id >= 2 Met...

You can wrap values into actions and pipe the result of one computation into another: return :: Monad m => a -> m a (>>=) :: Monad m => m a -> (a -> m b) -> m b However, the definition of a Monad doesn’t guarantee the existence of a function of type Monad m => m a -&...

person = name: "Duder von Broheim" age: 27 address: "123 Fake St" phoneNumber: "867-5309" {name, age, address, phoneNumber} = person

The unset command is used to remove one or more variables. unset ?-nocomplain? ?--? ?name name name name? Each name is a variable name specified in any of the ways acceptable to the set command. If a name refers to an element of an array then that element is removed without affecting the rema...

XML <Goku> <child name="Gohan"/> <child name="Goten"/> </Goku> XPATH count(/Goku/child) OUTPUT 2.0

The example below will collect the Device's OS version number and the the version of the application (which is defined in each projects' properties) that is entered into Version name on Android and Version on iOS. First make an interface in your PCL project: public interface INativeHelper { /...