typescript to es6

One, the expansion of the array, ES6 in the array to expand some of the API to achieve more functionality1.array.from: You can convert a class array and a data structure that can be traversed to a real array, as shown belowvar a = {' 0 ': 1, ' 1 ': 1,length:2};var arr = Array.from (a); Console.log (arr) Array [1, 1]---------------ES5 implementation-----------var arr = [].slice.call (a); Console.log (arr) Array [1, 1]function Fun () {var arr = array.fr

ES6 new features (Class) and inheritance (Extends) Related Concepts and Usage Analysis, es6extends This article describes the concepts and usage of new features such as ES6 and Extends. We will share this with you for your reference. The details are as follows: I. Class) 1. Basic syntax The traditional method of JavaScript is to define and generate new objects through constructors. The following is an examp

The main difference between the Commonjs module and the ES6 module is that thecommonjs module is a copy, the ES6 module is a reference , but understanding these, first understand the problem of object replication, in retrospect to understand the difference between the two modules.One, the basic data type module./a1.jsES6 Moduleexportvar=1;setTimeout=>=2,500);./a2.jsCOMMOJS Modulevar=2;module.exports= a2;set

quickly. But after ECMASCript 3 came out of 1999, there were no changes made to the official for a standard. Instead various browser vendors made their own custom extensions to the language, and Web developers were left to try and Support multiple APIs. Even after ECMAScript 5 is published in 2009, it took several years for wide browser support of the new spec, and most de Velopers continued to write code in ECMAScript 3 style, without necessarily being the aware. Around things started to cha

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

Sometimes it is really troublesome to write more variables, and a lot of tedious and similar repetitive work, es6 provides us with a variety of more convenient forms of declaring variables-deconstruct and assignment of variables. The following article describes the information about variable deconstruct assignment in ES6. For more information, see. Sometimes it is really troublesome to write more variables,

IntroducedECMAScript 6 will be a standard for ECMAScript over the next period of time. The standard is expected to be signed this year, whether on GitHub or in many communities, where JavaScript enthusiasts have already embraced change and enjoyed the beauty of ES6, this article will introduce some of the new features of ES6. Since ES6 is not well supported by br

ECMAScript6 (ES6) is the latest JavaScript standard. Because the current version of ES6 was released in 2015, it is also called ECMAScript2015. Small programs support most of the new features of ES6. C... ECMAScript 6 (ES6) is the latest standard for JavaScript. Because the current version of

would when stitching a normal string. They don't work well with internationalized libraries (which can help you provide different languages for different users), and template strings don't format numbers and dates in a particular language, let alone use different languages at the same time. They cannot replace the status of the template engine, for example: mustache, nunjucks. The template string has no built-in looping syntax, so you cannot iterate through an array to construct a

Here's a brief look at the implications of these new language features for the development of React applications, which make React development simpler and more interesting.ClassSo far, the best embodiment of our use of es6+ to write React components is that we chose to use the class definition syntax. Instead of using the React.createclass method to define a component, we can define a bonafide ES6 class to

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

1. PrefaceBecause the ES6 syntax is supported on various browsers, some browsers have a high degree of support for ES6 syntax, and some browsers support low, so in order to be compatible with most browsers, we need to use the Babel compiler to compile the ES6 syntax in the code into ES5 syntax when using ES6 syntax. Be

ModuleThe idea of the ES6 module is to be as static as possible, so that the dependencies of the modules can be determined at compile time, as well as the input and output variables. Strict mode ES6 module automatically adopts strict mode The Export command is used to specify the external interface of the module, a module is a separate file, all variables inside the file, external is not available

First, preface Before ECMASCRIPT6 (hereinafter referred to as ES6), there are only two scopes for ECMAScript:　1, the global scope;　　2, function scope.Because of these two scopes, there is a term in JavaScript-"variable lift (hoisting)".As follows:function func () { console.log (test); var test = 1;}; Func ();Execute the above code in the node environment with the result:The reason for ' undefined ' is ' variable elevation ', when ent

In this paper, the operating environment of the demo is Nodejs, reference: let Nodejs support ES6 lexical----Babel installation and use ;Default value of the function:If there are parameters, then use parameters, if there are no parameters, then use the default parameters;Ajax requests often have to make these judgments, ES6 set a new expression, so that the logic of judging parameters is more simple;1 2 3

First, module Overview JavaScript has no modular system, but with the advent of ES6, the module follows.Es6module's design idea is to be as static as possible, so that the compiler can determine the dependencies of the module, as well as input and output variables. In short, it's ' compile-time loading '.Es6module is relatively simple to achieve, easy to get started.Es6module advocates that a JS file is a module concept, consisting mainly o

(' lib '). Diag; Console.log (Square (11));//121Console.log (Diag (4, 3));//52.2 ECMAScript 6 Module SystemsThe ES6 module loads the advantages of compatible with CMD AMD.In addition, ES6 module syntax is more rigorous than commonjsModule loader based on promise, receiving a single modular modelSystem.import (' Some_module ') = { // use some_module }) . Catch (Error = {• • });You can als

in ES5, we have a for ... in: var phones = ["IPhone", "Nexus", "Nokia"]; for inch phones) { console.log (phones[i]);} // IPhone // Nexus // NokiaWhat we get from for...in is index of array.in ES6, for ... of can get value from array: var phones = ["IPhone", "Nexus", "Nokia"]; for (phone of phones) { console.log (phone);} // IPhone // Nexus // NokiaUsing for...of on object: varES6 ={edition:6, Committee:"TC39", Standard:"ECMA-

... Operator Convert an array into a comma-separated parameter sequence. Function push (array ,... items) {array. push (... items);} function add (x, y) {return X + Y;} VAR numbers = [4, 38]; add (... numbers ); Function calls with variable parameters Function push (array ,... items) {array. push (... items);} function add (... vals) {Let sum = 0; For (let I = 0; I More convenient array Merging Let arr1 = [1, 2]; let arr2 = [5, 6]; let newarr = [20]; // newarr = newarr in the old es5 statem