es6 for beginners

1 overview The traditional method of JavaScript language is to define and generate new objects by using constructors. Here is an example. function point (x, y) { this.x = x; This.y = y; } Point.prototype.toString = function () {return ' (' + this.x + ', ' + this.y + ') '; var p = new Point (1, 2);The above is very different from the traditional object-oriented language, such as C + + and Java, and it is easy to confuse the new programmer who is learning the language.

Author Jason Orendorff GitHub home Page Https://github.com/jorendorffIntroduction to the ES6 generator (generators)What is a generator?Let's start with an example:function* quips (name) { yield "Hello" + name + "!"; Yield "I hope you enjoy this introduction to ES6 's translation"; if (Name.startswith ("x")) { yield "your name" + name + " First letter is X, this is cool! "; } Yield "We'll see you ne

Here is the recursive/trailing recursive implementation of the reverse sequence (array/string) made with JavaScript. In addition, the early adopters used a ES6 destructuring assignment + spread operator to make a more functional version (only supported arrays).Correctness can pass the test (see the demo on my Github and write a small test frame), but efficiency is mark-especially with the ES6 feature versio

in addition to traversing the array elements. For example, if you have an enumerable property myarray.name in your array, the loop executes one extra time, traversing to the index named "name". Even the attributes on an array prototype chain can be accessed. Most shocking of all, in some cases, this code may traverse an array element in random order. In short, for-in is designed for ordinary objects, and you can iterate through the keys of the string type, so it does not apply to array traversa

Original address: https://hacks.mozilla.org/2015/08/es6-in-depth-modules/ES6 is the abbreviation for the 6th edition of ECMAScript, which is the standard for a new generation of JavaScript. ES6 in Depth is an introduction to a series of new features in ES6.ES6 is the abbrevi

One, the expansion of the array, ES6 in the array to expand some of the API to achieve more functionality1.array.from: You can convert a class array and a data structure that can be traversed to a real array, as shown belowvar a = {' 0 ': 1, ' 1 ': 1,length:2};var arr = Array.from (a); Console.log (arr) Array [1, 1]---------------ES5 implementation-----------var arr = [].slice.call (a); Console.log (arr) Array [1, 1]function Fun () {var arr = array.fr

ES6 new features (Class) and inheritance (Extends) Related Concepts and Usage Analysis, es6extends This article describes the concepts and usage of new features such as ES6 and Extends. We will share this with you for your reference. The details are as follows: I. Class) 1. Basic syntax The traditional method of JavaScript is to define and generate new objects through constructors. The following is an examp

The main difference between the Commonjs module and the ES6 module is that thecommonjs module is a copy, the ES6 module is a reference , but understanding these, first understand the problem of object replication, in retrospect to understand the difference between the two modules.One, the basic data type module./a1.jsES6 Moduleexportvar=1;setTimeout=>=2,500);./a2.jsCOMMOJS Modulevar=2;module.exports= a2;set

quickly. But after ECMASCript 3 came out of 1999, there were no changes made to the official for a standard. Instead various browser vendors made their own custom extensions to the language, and Web developers were left to try and Support multiple APIs. Even after ECMAScript 5 is published in 2009, it took several years for wide browser support of the new spec, and most de Velopers continued to write code in ECMAScript 3 style, without necessarily being the aware. Around things started to cha

‘], function (jQuery, _) { return factory(jQuery, _); }); } else if (typeof exports === ‘object‘) { // Node.js module.exports = factory(require(‘jquery‘), require(‘underscore‘)); } else { // Browser globals root.Backbone = factory(root.jQuery, root._); }}(this, function (jQuery, _) { var Backbone = {}; // Backbone code that depends on jQuery and _ return Backbone;}));You can see why this is not popular, it is too scary, no one will write, look at it, I just want to curse.

Introduction to the ES6 generator (generators)Let's start with an example:function* quips (name) {Yield "Hello" + name + "!";Yield "I hope you enjoy this introduction to ES6 's translation";if (Name.startswith ("X")) {Yield "Your name" + name + "First letter is X, this is cool!" ";}Yield "We'll see you next time! ";}This code looks much like a function, which we call a generator function, which has a lot in

ECMAScript 6 is the next-generation standard for JavaScript, which was officially released in June 2015. Mozilla will launch JavaScript 2.0 on the basis of this standard.The goal of ES6 is to make JavaScript languages available for writing large, complex applications that become enterprise-level development languages.As a monkey, I also want to try to ES6 what new features, so began the road of learning.Wri

ES6 Iterator (Iterator) and for. of loop usage method learning (Summary), es6for. 1. What is an iterator? The generator concept is available in Java, Python, and other languages, and ES6 is also added to JavaScript. Iterator allows us to use the next method of the Iterator object instead of initializing the set and the index variables. Instead, it returns the value of the next item of the Set, which is more

ECMAScript 6 is the next-generation standard for JavaScript, which was officially released in June 2015. Mozilla will launch JavaScript 2.0 on the basis of this standard.The goal of ES6 is to make JavaScript languages available for writing large, complex applications that become enterprise-level development languages.As a monkey, I also want to try to ES6 what new features, so began the road of learning.Wri

ECMAScript 6 is the next-generation standard for JavaScript, which was officially released in June 2015. Mozilla will launch JavaScript 2.0 on the basis of this standard.The goal of ES6 is to make JavaScript languages available for writing large, complex applications that become enterprise-level development languages.As a monkey, I also want to try to ES6 what new features, so began the road of learning.Wri

) { if (button) { button.prop("disabled", true); } var deferred = $.Deferred(); $.ajax(url, { type: "post", dataType: "json", data: data }).done(function(json) [ if (json.code !== 0) { showError(json.message || "操作发生错误"); deferred.reject(); } else { deferred.resolve(json); } }).fail(function() { showError("服务器错误，请稍后再试"); deferred.reject(); }).always(function() { if (button)

is "bound" to the area and is no longer affected by the external. var tmp = 123; if (true) { TMP = ' abc ';//referenceerror:tmp is not defined let tmp; } In the above code, the global variable TMP exists, but the block-level scope let also declares a local variable tmp, which causes the latter to bind the block-level scope, so the TMP assignment will be an error before let declares the variable. ES6 explicitly states that if a let and a cons

ECMAScript6 (ES6) is the latest JavaScript standard. Because the current version of ES6 was released in 2015, it is also called ECMAScript2015. Small programs support most of the new features of ES6. C... ECMAScript 6 (ES6) is the latest standard for JavaScript. Because the current version of

would when stitching a normal string. They don't work well with internationalized libraries (which can help you provide different languages for different users), and template strings don't format numbers and dates in a particular language, let alone use different languages at the same time. They cannot replace the status of the template engine, for example: mustache, nunjucks. The template string has no built-in looping syntax, so you cannot iterate through an array to construct a

Here's a brief look at the implications of these new language features for the development of React applications, which make React development simpler and more interesting.ClassSo far, the best embodiment of our use of es6+ to write React components is that we chose to use the class definition syntax. Instead of using the React.createclass method to define a component, we can define a bonafide ES6 class to