es6 course

1. The Iterator is an interface that provides a unified access mechanism for a variety of different data structures. Any data structure can be traversed (that is, all members of the data structure are processed sequentially) as long as the iterator interface is deployed.2. Iterator has three functions: one is to provide a unified and simple access interface for various data structures, and the other is to make the members of the data structure arranged in some order; the third is

Expansion of arraysOne, class array objects and traversed objects are converted to arraysThe Array.from () method is used to convert a class array object, a traversal object, to an array, which can traverse objects including ES6 new set and map structuresThe so-called Class array object, the intrinsic characteristic is that the length property must be1Let Arraylikeobj = {2' 0 ': ' A ',3' 1 ': ' B ',4' 2 ': ' C ',5Length:36 }7 8 ES5 conversion to an ar

Previous article "A ES5-based Vue demo" We talked about how to do a small demo with Es5,vue-router, and then we'll turn it into a es6+webpack based demo.I. Environment construction and code conversionWe build the Vue development environment first, according to one of my essays, "Vue Development environment Building and thermal Update", we step by step to build the development environment, project named Es6-

1.1 iterable literal meaning: iterative, repeatableiterableIs the new type introduced by the ES6 standard. and Array , Map and Set all belong to the iterable type1.2 Why join a iterable type? Traversing the array can take the subscript loop, and traversing the map and set cannot use the subscript. The collection type is not uniform. For a loop of type array for...in , an unexpected effect occurs when additional attributes are added. So it

ObjectiveMany years ago, we introduced code that was introduced directly with script SRC, or wrote a loadscript on its own.With script Src Way, when the project JS file more, there will be a lot of script tags on the page, put aside performance for the time being, the code is very ugly, and very poor maintenance, especially when the JS file has a dependency, more difficult to deal with.In order to solve this pain point, to handle the load and dependency of JS, and to promote JS modular developme

In the last chapter, the modular API is a static import process, that is, it is not possible to import some other modules dynamically according to the program logic. There is a dynamically imported API in the draft phase of the ES6 specification, but it was removed when the ES6 formal specification came out, you can refer to Https://github.com/ModuleLoader/es6-mo

The traditional way of JavaScript language is to define and generate new objects through constructors. Here is an example. (Can be Factory mode, constructor mode, combination of the advantages and disadvantages of the model can be found on the Internet) function point (x, y) { This.x=x; This.y = y; } Point.prototype.toString = function () { Return ' (' +this.x+ ', ' +this.y+ ') '; } var p= new Point; Define the way classes are used in ES6: Defines a

ES6 adds many new APIs to native objects such as Object, Array, String, Number, and Math. Object. prototype. proto: the object has the property proto, which can be called implicit original... ES6 adds many new APIs to native objects such as Object, Array, String, Number, and Math. Object Object. prototype. proto: an object has the property proto, which can be called an implicit prototype. the implicit p

Previously, out of curiosity, to implement the function of apply (without using call,bind), one write only found that Eval cannot be implemented unless the parameters passed in are all strings.Today, I suddenly see this ES6 new feature spread Opertor.Function.prototype.apply2 =function(obj, arg) {vart =typeofobj = = ' object ' !! Obj?Obj:window, Res; t.__func__= This; if(ARG) {if(! Array.isarray (ARG))Throw' Arg is not array '; Res= t.__func__ (... ar

ensures that the server never returns unnecessary model data, saving bandwidth. Falcor clients can also use cached data to serve continuous requests, reducing server response times. To learn more about Falcor, you can view videos of Jafar Husain. Webpack: As a module binder, Webpack can provide further support for react component modularity. It makes it easy for developers to compress and connect CSS and JavaScript, and make debugging work much easier by generating a source map. When the conf

Writing great ES6 style Promises for node. JS is only half the battle. Your great modules must include tests as well to ensure the future iterations don ' t break them. In this lesson, I show you a simple ES6 Promise in node. js, then walk to through creating tests in Mocha using Chai and C hai-as-promised to test both resolve and reject methods.Install:NPM i-D Chai chai-as-promisedIndex.jsExports.foo = (op

in JavaScript, the concepts of prototype, constructor, __proto__, constructors, prototypes, and instances have been a headache, plus ES6 class and extends have been messed up porridge, At ordinary times the use of less writing less, is to be well smoothed out clearly. Read several articles with their own understanding, understand as follows:constructor. prototype = prototype;constructor. Prototype.constructor = prototype. constructor = constructor;new

NPM Install Babel-cli-g//Installing BabelBabel Index.js-O A.js//equivalent to Babel index.js--out-file a.js copy index.js to A.jsBabel src/-D build///equivalent to Babel src/--out-dir build/Copy all files under the SRC directory into the build directory//------------------------------//The Babel command is placed in the Pageage for easy invocationPackage.json ="Scripts": { "Test":"echo \ "Error:no test specified\" exit 1", "Build":"Babel src/-D build/"//equivalent to Babel src/--out-dir

What is a ES6?　　ECMAScript 6, ES6, was officially released in June 2015!!!Two common grammar　　1. Declaring variable Const/let/varES6 used Var to declare variables, there are variable promotion ---will create variables in advanceScopes also have global scope and function scope only---So the variable elevation is at the top of the function or at the top of the global scope*************************************

the destructor assignment of a variable: ES6 allows you to extract values from arrays and objects in a certain pattern, assigning values to variables, which is called deconstruction (destructuring). The previous wording:var a = 1;var B = 2;ES6 allowable wording:Let [A, b] = [+];General Purpose:1. Value of exchange variable[x, Y] = [y,x];2. function returns multiple valuesFunction F1 () {return [+];} var [a,

1.array.from ()(1) converting to an arrayThe ①array.from () method canclass Array Object (The so-called array-like object, the intrinsic feature is only one point, that is, the length property must be. Therefore, any object with the Length property can be converted to an array by means of the Array.from method , at which point the extension operator cannot be converted. )and Ergodic (iterable) objects into real arrays. Includes ES6 new data structure

1. Let commandTips: Block-level scope (valid only in the current block) No variable promotion (must first be declared in use) Let the variable monopolize the block, no longer subject to external influence Duplicate declarations are not allowed In short: Let's more like the variable declaration directives of the static language we know wellES6 has a new let command to declare variables. The usage is similar to Var, but the declared variable is valid only within the code

ES6 today officially released (Roadside News), anyway, it will be released this month, before a lot of ES6 features have been fired very hot, but the total feeling and we have little relationship, because either some have not supported, or practicality is not very large, But today is a method that you must be familiar with or have used or heard.Believe that engaged in the front-end must have used angular ba

A simple example of using babel to convert es6 syntax to es5, babeles6 syntax es5 Preface Babel is a widely used Transcoder that can convert ES6 code into ES5 code for execution in an existing environment. This means that you can write programs in ES6 now without worrying about the support of the existing environment. This article describes how to pre-insta

ES6 provides MAP, it is a set of k-v pair. Key can be number, string, object, function and even undefined.var New Map ();Methods: 1. Set (K,V)M.set ("edition", 6) // key is the string m.set (262, "standard") // key is numeric M.set ( Undefined, "nah") // key is undefinedvarfunction() {console.log ("Hello" // key is a function2. Get (k)M.get (Hello) // Hello es6! M.get ("edition")