Feb 26, 2015 · You need to specify Symbol.iterator property for SomeClass which returns iterator for class instances. Iterator must have next() method, witch in turn returns object with done and value fields. Simplified example: function SomeClass() { this._data = [1,2,3,4]; } SomeClass.prototype[Symbol.iterator] = function() { var index = 0; var data = this ...

Nov 28, 2016 · What does adding a class to a DOM element have to do with learning the language? document.getElementById ('div1').className is as much a library related issue as using jQuery to do the same is. The question was "how can I do that", a thoroughly tested library is the sensible answer.

I got this example from the * JavaScript Patterns Build Better Applications with Coding and Design Patterns book (by Stoyan Stefanov). In case you need some simple implementation class like a singleton object, you can use an immediate function as in the following: var ClassName; (function() { var instance; ClassName = function ClassName() {

Let's assume you do not use a library such as jQuery. If you do not already have a reference to the DOM element, get one using var elem = document.getElementById('id'); Then you can set any CSS property of that element. To show/hide, you can use two properties: display and visibility, which have slightly different effects: Adjusting style.display …

Jan 27, 2020 · In JavaScript, global functions can only be defined in the global context. If you want to define a class-related function, you should either define it as a class method or as an arrow function:

Oct 12, 2013 · If you create your objects in a different way (using class, extend ing 'Function' type), you can have a callable instance of it. See also: How to extend Function with ES6 classes?

Sep 11, 2008 · Note for modern readers, this question was asked (and answered) before modern versions of Javascript, (known as ECMAScript (or ES)) was in use. If you're just learning JavaScript, the difference in syntax / lack of a class is because this question is old. An experimental feature exists that does allow private methods nowadays, with the use of a # as a prefix, but doesn't have 100% support as ...

Mar 4, 2014 · Wrapping a class inside a function seems to defeat the whole purpose of using classes in the first place. If you already use the function to create an instance, you might as well place all your private/public members inside that function as …

Feb 28, 2009 · JavaScript Classes and Inheritance (ES6) According to ES6, you can use JavaScript classes and inheritance to accomplish what you need. JavaScript classes, introduced in ECMAScript 2015, are primarily syntactical sugar …

Given an object obj, I would like to define a read-only property 'prop' and set its value to val. Is this the proper way to do that? Object.defineProperty( obj, 'prop', { get: function () { ...