es6 book

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

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

Author Jason Orendorff GitHub home Page Https://github.com/jorendorffDo you know what symbols is in ES6 and what does it do? I believe you probably don't know, so let's explore!Symbols is not used to refer to a certain kind of logo.They are also not small icons that can be used as code.They are not literary methods to replace other things.They are more unlikely to be used to refer to homophonic words cymbals (cymbals).So, what exactly is symbols?It is

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

IOS Address Book programming, listening for system address book changes, and ios address book Listen for address book changes The client code must be implemented as follows: /* Remove the registration function */-(void) dealloc {ABAddressBookUnregisterExternalChangeCallback (_ addressBook, ContactsChangeCallback, nil)

"15" ES6 for humansTotal 148 page: Now see: Read all.Amazon Address:Konjac: summary: I first looked at Ruan Yi Feng's online books. Many of the contents of the book are repeated. Actually sells ￥463. And no one else. are basic concepts. Add some instance code. Not much in-depth content.PS: E-book is put on the net disk.Recommended index: 2 stars.Catalog: 1. Getti

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

Block-level scopes ES5 does not have block-level scope, only global scope and function scope, because of this, the scope of the variable is very wide, so a entry function is to create it immediately. This creates the so-called variable ascension. ES5 's "variable Elevation" feature is often inadvertently caused by a mistake: 1. Inner variables cover outer variables var tmp = new Date (); function f () { console.log (TMP); if (false) {//execute undefined var tmp = "Hello World"; } }

advance.B.foo ()}});CMD is another JS modular scheme, and it is similar to AMD, the difference is that AMD respected the reliance on pre-and early-execution, CMD respected near-dependency, deferred execution. This specification is actually produced in the process of sea.js promotion./ AMD notation /Define (["A", "B", "C", "D", "E", "F"], function (A, B, C, D, E, f) {is equal to the first declaration and initialization of all modules to be usedA.dosomething ();if (false) {Even though it didn't w

Can a function be declared in a block-scoped scope? This is a rather confusing question.ES5 states that functions can only be declared in the top-level scope and function scope, not at the block-level scope.1 //situation one2 if(true) {3 functionf () {}4 }5 6 //Scenario Two7 Try {8 functionf () {}9}Catch(e) {Ten // ... One}The above two function declarations, according to the provisions of ES5 are illegal.However, the browser does not adhere to this rule, in order to be compatible with the

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