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Learn how to use array reduction to create functional pipelines by composing arrays of functions.const increase = (input) => { return input + 1;}cons... 阅读全文
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Example 1:function *topicList(){ yield "ES2015"; yield "Semi-colons: good or bad?"; yield "TypeScript";}for( let topic of topicList() ){ console.l... 阅读全文
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Iterables return an iterator object. This object knows how to access items from a collection 1 at a time, while keeping track of its current position ... 阅读全文
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How to use:export default function getReplies(topicId){ return new Promise(function( resolve, reject ){ _getRepliesForTopic(topicId, function(data... 阅读全文
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Export variable:export const MAX_USERS = 3;export const MAX_REPLIES = 3;Export default class:export default class FlashMessage { constructor(message)... 阅读全文
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Default export:Default export is easy way to export a function to outside module.//flash-message.jsexport default function(message){ alert(message);... 阅读全文
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In constructor, you can call parent's constuctor() method by supert();class ShoppingCart { constructor(userId){ this.userId = userId; this.prod... 阅读全文
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Limitations With ArrayArrays don't enforce uniqueness of items. Diplicate entries are allowed.Using Setslet tags = new Set() ;tags.add('Javascript');t... 阅读全文
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WeakMap: is a type of Map where only objects can be passed as keys. Primitive data type -- such are string, numbers, booleans, etc --- are not allowed... 阅读全文
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Use Maps when keys are unknown until runtime:Map:let recentPosts = new Map();createPost( newPost, (data)=>{ // Key unknown until runtime, so use Ma... 阅读全文