es6 book

IntroducedECMAScript 6 will be a standard for ECMAScript over the next period of time. The standard is expected to be signed this year, whether on GitHub or in many communities, where JavaScript enthusiasts have already embraced change and enjoyed the beauty of ES6, this article will introduce some of the new features of ES6. Since ES6 is not well supported by br

ModuleThe idea of the ES6 module is to be as static as possible, so that the dependencies of the modules can be determined at compile time, as well as the input and output variables. Strict mode ES6 module automatically adopts strict mode The Export command is used to specify the external interface of the module, a module is a separate file, all variables inside the file, external is not available

First, preface Before ECMASCRIPT6 (hereinafter referred to as ES6), there are only two scopes for ECMAScript:　1, the global scope;　　2, function scope.Because of these two scopes, there is a term in JavaScript-"variable lift (hoisting)".As follows:function func () { console.log (test); var test = 1;}; Func ();Execute the above code in the node environment with the result:The reason for ' undefined ' is ' variable elevation ', when ent

In this paper, the operating environment of the demo is Nodejs, reference: let Nodejs support ES6 lexical----Babel installation and use ;Default value of the function:If there are parameters, then use parameters, if there are no parameters, then use the default parameters;Ajax requests often have to make these judgments, ES6 set a new expression, so that the logic of judging parameters is more simple;1 2 3

First, module Overview JavaScript has no modular system, but with the advent of ES6, the module follows.Es6module's design idea is to be as static as possible, so that the compiler can determine the dependencies of the module, as well as input and output variables. In short, it's ' compile-time loading '.Es6module is relatively simple to achieve, easy to get started.Es6module advocates that a JS file is a module concept, consisting mainly o

(' lib '). Diag; Console.log (Square (11));//121Console.log (Diag (4, 3));//52.2 ECMAScript 6 Module SystemsThe ES6 module loads the advantages of compatible with CMD AMD.In addition, ES6 module syntax is more rigorous than commonjsModule loader based on promise, receiving a single modular modelSystem.import (' Some_module ') = { // use some_module }) . Catch (Error = {• • });You can als

in ES5, we have a for ... in: var phones = ["IPhone", "Nexus", "Nokia"]; for inch phones) { console.log (phones[i]);} // IPhone // Nexus // NokiaWhat we get from for...in is index of array.in ES6, for ... of can get value from array: var phones = ["IPhone", "Nexus", "Nokia"]; for (phone of phones) { console.log (phone);} // IPhone // Nexus // NokiaUsing for...of on object: varES6 ={edition:6, Committee:"TC39", Standard:"ECMA-

... Operator Convert an array into a comma-separated parameter sequence. Function push (array ,... items) {array. push (... items);} function add (x, y) {return X + Y;} VAR numbers = [4, 38]; add (... numbers ); Function calls with variable parameters Function push (array ,... items) {array. push (... items);} function add (... vals) {Let sum = 0; For (let I = 0; I More convenient array Merging Let arr1 = [1, 2]; let arr2 = [5, 6]; let newarr = [20]; // newarr = newarr in the old es5 statem

Detailed Description: webpack + es6 + angular1.x project construction, webpackangular1.x Technology stack Overview ES2015 (ES6) ES2015, as its name implies, is a set of standards officially released by ECMAScript in June 2015. ES6 indicates the sixth change of ECMAScript. (JavaScript is an implementation of the ECMAScript Specification ). ES5 has gradually been r

Es6 String extension (instance description), es6string New Feature: Template string Traditional string Let name = "Jacky"; let occupation = "doctor"; // traditional String concatenation let str = "He is" + name + ", he is a" + occupation; Es6 simple String concatenation Let name = "Jacky"; let occupation = "doctor"; // template String concatenation let str = 'he is $ {name}, He is a $ {occupation }'; Compar

Node. js exports, module. exports, and ES6 export, export default in-depth explanation, node. jses6 Preface Recently, it is rare to have time. I decided to learn node programming again in a standardized manner. However, the introduction module I see uses the require method, and I think of our ES6 various export and export default. Axi, The heads are all big .... When the head size is over, let's take a look

I. OverviewES6 is now in its prime, companies are trying to use, and as a front-end engineer ES6 is also the highlight of Technology. however, the current browser is not particularly compatible with ES6 support, and ultimately the need to convert ES6 to Es5,webpack using the babel-loader loader for conversion, its configuration is very easy.second, the configurat

consideration, we also need to use logic like this in each of the callback layers try...catch . This is the source of all evils and the point at which node is beginning to be widely criticized. Another disadvantage is that, assuming there is no dependency between our three saves, we still need to wait for the previous function to finish before we can perform the next step, instead of three to save the parallel, and then return a three saved result after the save. (or to implement it requires s

Modules is one of the most important features introduced by ES6.So later write the module, directly according to ES6 modules syntax to write, and then use Babel + Browserify to package on the line. The modules specification is divided into two parts, part of how it is exported, and part of how it is imported. Basic Usage named export (named exports) You can export it directly by adding an export keyword to

This article summarizes several ways to use ES6 under Webstorm.The first thing to choose is the version of JavaScript. Click "File", "Settings", "Languages Frameworks", "JavaScript", and select "ECMAScript6" in "JavaScript Language Version".Create a file called Calc.js.class calc{ constructor () { console.log (' Calc constructor '); } Add (b) { return a + B; }} var New Calc (); Console.log (C.add (2, 3));In order to compile the

We all know it's not good to extend an object directly on a native object. So prototype such a library is widely criticized.Some libraries, such as Lodash, use a toolkit-style extension to bypass the inheritance of objects.Because of the appearance of the Es6 class, I tried to extend it in the way that the array derives the child object.Here is a simple example.' Use strict 'class ABC extends array{ GetArray () { returnthis; } Let x=new ABC (5).

Object-oriented programming:two basic concepts of objects in Java:1. Class: Class is the template of the object, for example leader this is general term leader, not specifically who.2: Instance: an instance is an object created from a class, and many instances can be created according to class leader: Liyi,yingjiangyong and so on. Each instance represents a specific leader, and theyAll belong to the leader type.There are no classes and instances in previous versions of

This article all the demo running environment is Nodejs, reference: let Nodejs support ES6 lexical----Babel installation and use ;　　ES6 Adds a new data type:symbol,symbol is the perfect choice for defining the unique property name of an object;How symbol is usedHow symbol is used, symbol is not a constructor oh, if you use new symbol, you will get an error:var sym1 = Symbol (); var sym2 = Symbol ("foo"); va

Introduction to Use Cases of instance parsing ES6 Proxy, es6proxy Features such as Arrow functions, array deconstruct, and rest parameters in ES6 have been widely circulated once implemented. However, features such as Proxy are rarely used by developers, on the one hand, browser compatibility, on the other hand, developers need to have a deep understanding of the application scenarios to take advantage of t

In ES6, the function binding and event binding functions of javascript are described in detail. es6javascript This article describes how javascript in ES6 binds functions to functions and events of classes. We will share this with you for your reference. The details are as follows: Function binding The arrow function can bind this object, greatly reducing the call, apply, and bind statements for explicitly