es6 book

The modular development method can improve the code reuse rate and facilitate the management of code. Usually a file is a module that has its own scope, exposing only specific variables and functions to the outside. The current popular JS Modular specification has COMMONJS, AMD, cmd and ES6 module system. The evolution of the front-end modularity can be seen in the Nanyi teacher's article. This paper mainly introduces the modular realization mode unde

Quoted http://es6.ruanyifeng.com/#docs/array1. Extension operators (...) ）The extension operator (spread) is a three-point ( ... ). It is like the inverse of the rest parameter, converting an array to a comma-delimited sequence of arguments.This operator is primarily used for function calls.function push (array, ... items) { Array.push (... items);} function add (x, y) { return x + y;} var numbers = [4// Apply method to replace arrayBecause the ext

].includes(3, -1); // trueExpansion of the object1.ES6 allows you to write directly to variables and functions as properties and methods of an object (in an object, when you write a variable directly, the property name is the variable name, and the value of the variable is the value)//属性简写var foo = ‘bar‘;var obj = {foo};obj // { foo : "bar" }//变量简写var mine = { foo , method(){ //to do }}2.ES6 allows the lite

Today we are going to introduce the arrow functions in ES6. Grammar Let's look at the syntax of the arrow function first: ([param] [, param]) => { statements } param => Param is a parameter, depending on the number of parameters, divided into these several cases:() => {...}//0 parameters are represented by ();x => {...}///A parameter can be omitted ();(x, y) => {...}//Multiple parameters cannot be omitted (); Sample Let's take a look at some exa

Before es6 out, JS Scope has only two top-level scopes and function scopes, but the appearance of ES6, let JS variable scope has a new existence form: block-level scope . Before you know the block-level scope, you have to review the variable declarations and scopes of the ES5 . Variable declaration: We all know that JS uses the VAR keyword to declare a variable, and if you don't use the VAR keyword to decla

Please specify the Source: Grape City website, Grape City for developers to provide professional development tools, solutions and services, empowering developers. Original source: wanago.io/2018/07/16/webpack-4-course-part-one-entry-output-and-es6-modules/ How are you doing! Today we will start a Webpack 4 introductory tutorial. We will start with the basic concept of webpack, as the tutorial progresses. This time, we will learn the basics of modu

Attention:1. In the node environment, the--harmony parameter enables the ES6 new feature, many new features will only take effect under strict mode, so use strict or--use_strict, otherwise harmony is not enabled;1. Block-level scope (block scope)// Block Scope function F1 () { console.log ("Outside.") );} (function() { if(false) {F1 defined within the IF {} function F1 () { console.log ("Inside.") ); } } F1 ();} (

This digest from Nanyi Teacher's "ECMAScript 6", original address: http://es6.ruanyifeng.com/#docs/introECMAScript 6 is a generic term that means the next-generation standard for JavaScript after the 5.1 version, covering the ES2015, ES2016, ES2017 and so on.The Babel transcoding device is a widely used ES6 transcoding device that can convert ES6 to ES5.configura

Transfer from HTTP://SIMPLYY.SPACE/ARTICLE/577C5B0DCBE0A3E656C87C24 Multiple successive arrow functions and the high-order function of the curry Higher-order function definition: a function that functions as an argument or a return value is a function. So there are two kinds of higher-order functions: are common to us sort , reduce such as functions. The return value is a function of the function. Generally speaking, it is easy to understand the common higher

1, the first global installation BABEL-CLI, the input command npm install babel-cli-g2, input CD d:\es6 ; ---Enter the folder path 3, enter NPM init, go to the---(Guide you to create a Package.json file, including name, version, author, etc.) 4, enter NPM install--save-dev BABEL-CLI;---(Install command line transcoding BABEL-CLI tool) 5. Create a new configuration file in the Es6 file. BABELRC Copy code {"P

Vi. DeconstructionDeconstruction provides a convenient way to extract data from an object or array, see the following example:Es6let [X,y]=[1,2];//x=1,y=2//es5var Arr=[1,2];var X=arr[0];var y=arr[1];With this syntax, you can assign values to multiple variables at once. A good addition is the ability to exchange variable values very simply:Let x=1,y=2; [X,y]=[y,x];x=2 Y=1Deconstruction can also be used with objects, paying attention to the corresponding keys that must exist in the object:Let Obj=

Detailed explanation of Webstorm new. vue file support highlighting vue syntax and es6 syntax, webstorm. vue Webstorm adds the new. vue file function and supports highlighting vue syntax and es6 syntax. The details are as follows: Add a new. vue File ① Search for vue in File-Plugins in the upper-right corner of Webstorm. If no vue exists, download serch in repositories. ② Click to install vue. js ③

1.1.Array.from ()The Array.from method is used to convert two types of objects into real arrays: arrays-like objects (Array-like object) and objects that can traverse (iterable), including ES6 The new data structure Set and the Map ). The following is an array-like object, Array.from it into a real array. Let Arraylike = { ' 0 ': ' A ', ' 1 ': ' B ', ' 2 ': ' C ', 　　Array.from can also accept the second parameter, which acts like a map met

Third, extended character encoding of stringsInside JavaScript, characters are stored in UTF-16 format, with each character fixed at 2 bytes. For characters that require 4 bytes of storage (Unicode code points greater than 0xFFFF characters), JavaScript considers them to be two characters. However, Chinese characters tend to be 4 bytes of storage, which is a bit cumbersome to ES6 before processing.Example: Character encodingvar"李刚";var"ligang";Chinese

Recently, I was also preparing for the interview, in the review algorithm, witty use of a wave of ES6. Come and see!1. The de-weight of the array var arr=str.split ('); for (var i=0;i) { for (var j=i+1;j) { if(arr[i]==arr[j]) { Arr.splice (J,1); // arr.length-=1; Delete the length automatically minus 1 j--; Console.log (arr) }

Using ES6 To use ES6, we need loader. Modify webpack.config.js File: Module.exports = { './index.js ', output: { ' bundle.js ', path: __dirname }, module: { loaders: [ /\.js$/, loader: ' Babel ', exclude: '/node_modules/'} ] }};We Add Module property, which are an object. We define the Loaders property Here which are an array of objec

ES6 's new features add class and class inheritance, in fact this feature is also borrowed from the background language, first look at the next es5 how to construct an object function Human () { this.eyes=2; this.hands=2; } Human.prototype.singing=function () { console.log (' I can Sing '); } Let A = new Human (); Console.log (a); A.singing ();As above, an object called human is constructed with the ES5 method, 2 attributes are created in the

Object.is (A, b) Before talking about this method, first of all, I want to talk about the difference between = = = = = = = = = = = = = = = = = = = -_-! = =: When the comparison is automatically converted to the type, to compare. = =: The only drawback is that Nan is not equal to itself, +0 and 0 equals. the ES6 adds object.is (A, B) to this method: console.log (+0 = = -0);//true console.log (nan = = nan);//false Console.log (Object

Starting in: https://mingjiezhang.github.io/. In JavaScript, the This object is bound by the runtime based on the execution environment (that is, the context) of the function. From the demo in react When Facebook last updated react, the class in Es6 was added to the creation of the component. Facebook also recommends that component creation use define a component class by defining a class that inherits from React.component. The Official Demo:

The original is from my Front-end blog: http://www.hacke2.cn/arrow-functions-and-their-scope/ http://es6rocks.com/2014/10/arrow-functions-and-their-scope/the original link translation: @liningone Rock ES6 China Station is about to go online, we look forward to it, You can also contact me or ES6 to make a contribution to the event. In ES6 many great new features,