es6 for beginners

Previous wordsThe array is a basic JS object, and as time progresses, the rest of JS is evolving, and until the ES5 standard introduces some new methods to simplify the use of the array object. The ES6 standard continues to improve the array, adding many new features. This article describes in detail the ES6 array extensionCreate an arrayBefore ES6, there are two

Objective This article is mainly for ES6 to do a brief introduction, perhaps you do not know what ES6 is, in fact, it is a new JavaScript specification. In a time when everyone is busy, if you want to have a quick understanding of ES6, read on to learn about the six features of the latest generation of JavaScript, the most popular programming language today. In

注：ES6的一些新属性会显示语法错误，不过不会影响效果，在Languages里面也可以调；Let: used to define variables特点：只能在代码块里面使用,let拥有块级作用域;并且let不允许重复声明;比如: var a = 12; var a = 5; alert(a);//5; let a = 12; let a = 5; alert(a);//报错;Identifier ‘a‘ has already been declared代码块:{}包起来的代码,形成了一个作用域,比如if,for,while,json除外;块级作用域;var 只有函数作用域;用处: 自执行函数: for(let i = 0; i Const: Typically used to define constants常量:不允许修改;有些时候定的变量不希望被改变,这个不希望被改变的值就是常量;比如:let a = 5; a = 12; alert(a);//12;其实

ES6 Let (understanding closures) and Const commandsRecently, the process of doing the project, the use of ES6, because few contact before, so the use is not familiar. Therefore purchased the Nanyi Teacher's ES6 standard introduction, here Thanks Nanyi Teacher's book.We know that ECMAScript 6, ES6, is the fifth version

How to use Set, WeakSet, es6setweakset in ES6 ES6 provides two new data structures: Set and WeakSet. Set is similar to an array, but the values of member variables are unique and there are no repeated values. WeakSet is also a set of non-repeated values, but can only be used to store objects. 1. Set usage (1) Set itself provides a constructor to generate a Set data structure. var s = new Set();[2,2,2,5,8,16

ES6 is extended for numeric types (number):1. A new notation for binary and octalES6 provides a new notation for binary and octal values, expressed in 0b (or 0B) and 0o (or 0o) respectively. For example:0b111110111 = = = 503 // true= = = 503 //trueSince ES5, in strict mode, octal is no longer allowed to use the prefix zero, so it is further clarified in the ES6 and is represented by 0o.If you want to con

Application code parsing of es6 in react and es6react code parsing Whether React or React-native, facebook officially recommends ES6 syntax. If ES6 is not used in projects, some problems may occur during the conversion, if there is no time for the system to learn ES6, it is enough to pay attention to some common writin

abandoned because it was too aggressive, Adobe's ActionScript 3.0 was the only implementation of ECMAScript Edition 4 (Flash almost unified the Web) By the year 2012, things have suddenly started to change. Everyone started pushing to stop support for older versions of Internet Explorer, and writing code in ECMAScript 5 (ES5) style became more feasible. At the same time, a new ECMAScript specification is starting to start. By this time, people began to become accustomed to the version of t

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 m

This article mainly introduces the representation of JSES6 multi-line strings and connection strings, and compares and analyzes the representation and related operation skills of multi-line strings and connection strings in ES6 based on the specific instance form, if you need it, refer to the next article to introduce the representation of multiple lines of strings and connection strings in JS ES6, compare

]; Array.prototype.remDub= Array.prototype.remDub | |function(){ varJSON = {}; for(vari = 0; i This. length; i++) {json[ This[i]] | | (json[ This[i]] = This[i]); } vararr = []; for(varNameinchJSON) {Arr.push (json[name]); } returnarr;}; Console.log (Arr.remdub ()); //[1, ' A ', undefined, null, NaN]Above this use of JSON can be achieved, in fact, Es6 did not come out before using this is good, but

(connected to the previous article)Standard ES6 Features6. The new string method/new string methods7. Symbol/symbols8. String Template/template StringsThe new string method/new string methodsCodepointat () and string.fromcodepoint ()JS interior is in the form of UTF-16 (each character length is fixed to 16 bits, 2 bytes) to store character encoding. In terms of Chinese characters, most of the Chinese characters are stored in 2-byte form, but some Chin

As the future of JavaScript, ES6 has arrived. As a finished standard, ES6 brings many new features that make it still competitive in today's web world. All aspects of ES6 are not necessarily suitable for you, this Assembly briefly introduces some of the new features that are handy and feasible.I write JavaScript code that prefers to use single quotes to define st

1 Syntax support settings Preferences > Languages Frameworks > JavaScript Just configure the ECMAScript version hereAfter configuration2 Automatic transcoding to ES5 File Watcher + Babel (ES6 transcoding) You may want to have better compatibility with your code, but the current ES6 is definitely not supported by all browsers, so we'll use the

Two static methods provided by ES6: Array.from Array.of ES6 provides methods for manipulating, populating, and filtering arrays: Array.prototype.copyWidthin Array.prototype.fill Array.prototype.find Array.prototype.findIndex The methods in ES6 for array iterations: Array.prototype.keys Array.prot

This period of time, learn a little about es6 new norms of knowledge, and then whim, want to try to write with ES6 code in the browser run. Say dry, first said my implementation steps (did not expect to have a pit!) ） Translating ES6 code into ES5; The HTML file introduces the translated ES5; Then run in the browser environment; Run in the node environ

This article describes the babel6.x installation process ~ First of all, you can use the Babel online conversion https://babeljs.io/repl/ Then go to the topic: Install Babel (command line environment, for babel6.x version) 1, first install BABEL-CLI (used in the terminal to use Babel) NPM install-g BABEL-CLI 2, then install the babel-preset-es2015 plugin NPM Install--save babel-preset-es2015 　　Note: The BABEL5 version defaults to include a variety of conversion plug-ins, however babel6.x

If you want to build a new JavaScript application with react, and you want to practice the new features in ES6 syntax, and you even want to create reusable components and post them to NPM, how exactly do you implement these requirements? How you publish ES6 code to NPM and how to use that code in subsequent projects. It took me some time to solve these problems and now I would like to share with you the new

A word summary: using Webstorm's own file Watcher function +babel to achieve automatic conversion ECMAScript 6 code for ES5 code1.Create a new empty Project, and then create a new main.js in the SRC directory;This step is not necessary, just get started. It will be much less disruptive to start your own configuration from an empty project.2.Enter settings to change JavaScript language version to ECMAScript 6;3.And then. Write a section of ES6 code'Use

ES6 introduced a lot of new syntax features, but want to do in the existing browser environment, need to ES6 code to ES5 code, there are many transcoding babel,traceur, etc., after reference, use Traceur and gulp to build ES6 environment, start my ES6 .Start installationFirst make sure the Nodejs is installed on your c