es6 course

ES6 (ECMAScript 6) is the upcoming new version of the JavaScript language standard, code-named Harmony (meaning of harmony, obviously did not keep pace with our country, we have entered the Chinese Dream version). The last standard was enacted in 2009 ES5. The ES6 is currently in the process of standardization and is expected to release the officially finalized version in December 14. But most of the standa

In the ES6 new fast-scope concept (C language, as C-language JS, of course, should be added), is very good understanding.{let i;} Console.log (i); // i am not definedUse the new scope in the code block.The problem is that the FOR statementLet arr=[]; for (Let i=0;i) { arr[i]=function() { console.log (i); };}Many of the explanations do not specifically describe how the scope of the work is s

; let val = " } ES6 rules that if let is present in a code block, the chunk forms a closed scope from the beginning. Any use before the declaration, will be an error. That is, within a code block, using a variable before a let declaration is not available. There is a grammatical term called "temporary Dead Zone" (temporal dead Zone), referred to as TDZ. Of course Tdz does not appear in the ES

,for.function func (arr) {for (Let i = 0; i 　　Example 3: Variable promotion (declared after use)function func () {//Val first declared after use, no Error alert (val)//Undefinedvar Val;}The variable Val is declared after the first use, output undefined, and no error.Change Var to let, it's an error.The function func () {//Val is declared after the first use, reporting syntax error alert (val) let Val;}　　Example 4: variable Promotion (first judgment and later declaration)function func () {if (typ

are reviewing again. 3.someLet arr=[' xzblogs ', ' Little Wise ', ' Zachary '];arr.some (x=>console.log (x));4.mapLet arr=[' xzblogs ', ' Little Wise ', ' Zachary '];console.log (arr.map (x= ' web ')); Map is a replacement here, and this is a follow-up course that will be explained in detail. Array conversion stringIn development we often encounter the output of the array into a string form, we learn two methods today, you should pay attention to the

{let arr= Array.of (3, 4, 7, 9, 11); Console.log (' arr ', arr);//[3,4,7,9,11]Let empty =Array.of (); Console.log (empty); //[]}//ES6 adds the FROM function to array to convert other objects into arrays. //of course, other objects are also required and not all, and two objects can be converted to an array. //1. Objects with iterator interfaces are deployed, such as: Set,map,array. //2. Class Array object, w

"]; Ok.name= "Sblzh"; Add a member variable to this array object //Add a member method to this array object ok.myfun=function (x,y) {return x+y; }; Attempt to traverse with for-of for (let I of OK) { console.log (i);//Note that there is no need for ok[i], just use one I } Output LZH is rubbish sb big SB Dog the foreach () method of an iterative object The Foreach method receives a function as a parameter, so the function passed in is called the callback callback function . In each ite

This article is mainly to share with you about the ES6 series of statement variables let and const, interested friends can refer to the content of this article Brief introduction Concept The first version of ES6, released in June 2015, is the official name of the ECMAScript 2015 Standard (ES2015). ES6 is both a historical noun and a generic term, meaning the nex

ES6 Babel is correctly installed in JavaScript, es6babel This document describes how to install Babel6.x ~ First, you can use Babel online conversion https://babeljs.io/repl/ Then go to the topic: Install Babel (command line environment, for Babel6.x) 1. First install babel-cli (used to use babel on the terminal) Npm install-g babel-cli 2. then install the babel-preset-es2015 plug-in Npm install -- save babel-preset-es2015 Note: Babel5 contains vario

Atitit JS es5 es6 new features Attilax Summary1.1. JavaScript Development timeline:11.2. The following is a List of the best features of ES6 Top ten (in alphabetical order):11.3. Es6 support basic Chrome FF 360se8 fully supports 22. Top ten features of ECMAScript(ES6) – WEB front-end development - Focus on front

Brief introductionWelcome to the Deep Exploration es6! In this new week series, we will explore ECMAScript 6. This is a new version of the JavaScript language that is coming soon. ES6 contains a lot of new language features, and these language features make JS more powerful and expressive. In the next few weeks, we'll get to know these new features one by one. But before we get into the details, it's worth