1 JavaScript Promise迷你书（中文版） 原著：azu / 翻译：liubin、kaku、honnkyou Revision History Revision 1.4.1 原/翻 Table of Contents 前言 ........................................................................... .................... 5 Chapter.1 - 什么是Promise ...................................................................................................... 5 什么是Promise ...................................... ........................... 5 Promise简介 ...................................................................................................................... 7 编写Promise代码 ...........................

JavaScript Promiseの本 azu Table of Contents はじめに ....................................................................................................................... 3 書籍の目的 .................... ........................... 5 Chapter.1 - Promiseとは何か ..................................................................................... 5 What Is Promise ......................................... .................................... 5 Promise Overview .............................................................................................. 7 Promiseの書き方 ..................................

JavaScript Promiseの本 azu Table of Contents はじめに ....................................................................................................................... 3 書籍の目的 .................... ........................... 5 Chapter.1 - Promiseとは何か ..................................................................................... 5 What Is Promise ......................................... .................................... 5 Promise Overview .............................................................................................. 8 Promiseの書き方 ..................................

to pause the video stream during the talk. 23 REVIEW C++ COROUTINE IN 10 MINS • Core concepts: promise object, coroutine handle • Keywords: co_return, co_await, co_yield(not covered here) • awaitables https://lewissbaker.github.io/2018/09/05/understanding -the-promise-type • User defined type(s) that stores whatever you want/required Promise Object Coroutine Handle • Literally a handle • Two different coroutine_handle<>, coroutine_handle<Promise> • coroutine_handle<>: resume/destroy coroutine, check status(done) • coroutine_handle<Promise>: provide access to the promise object(promise) Useful to know For convenience:

Non-blocking! writer.Close(); thread x thread yfutures/promises: “buffered channel” Promise promise; Channel::Reader reader = channel.Reader(); reader.Read(); // Blocks! Non-blocking! writer.Close(); thread x thread yfutures/promises: “buffered channel” Promise promise; Channel::Reader reader = channel.Reader(); reader.Read(); // Blocks! Close(); thread x thread yfutures/promises: “buffered channel” Promise promise; Future future = promise.Future(); reader.Read(); // Blocks! Channel::Writer writer

} }8/55 The coroutine promise promise type9/55 Cheat Sheet - Promise Type 1 struct ReturnType / std:: coroutine_traits < ReturnType , ...> { 2 struct promise_type { 3 promise_type (T...); // opt. 4 Awaitable 1 struct Awaitable { 2 bool await_ready (); 3 auto await_suspend (std:: coroutine_handle < promise_type >); 4 auto await_resume (); 5 };12/55 Cheat Sheet: Map of Coroutine Land13/55 Get the cheat Async { struct promise_type { /* ... */ }; };34/55 Setting up the Async object template struct Async { struct promise_type { /* ... */ }; std:: coroutine_handle <promise_type > self ;

命令 变量的解构赋值 字符串的扩展 正则的扩展 数值的扩展 函数的扩展 数组的扩展 对象的扩展 Symbol Set 和 Map 数据结构 Proxy Reflect Promise 对象 Iterator 和 for...of 循环 Generator 函数的语法 Generator 函数的异步应用 async 函数 Class 的基本语法 Class 的继承 句法（syntax），而不转换新的 API，比 如 Iterator 、 Generator 、 Set 、 Maps 、 Proxy 、 Reflect 、 Symbol 、 Promise 等全局对象，以及一些定义在全局对象上的方法（比 如 Object.assign ）都不会转码。 举例来说，ES6 在 Array 对象上新增了 Array.from 方法。Babel prototype[Symbol.toStringTag] ：'DataView' Map.prototype[Symbol.toStringTag] ：'Map' Promise.prototype[Symbol.toStringTag] ：'Promise' Set.prototype[Symbol.toStringTag] ：'Set' %TypedArray%.prototype[Symbol.toStringTag]

ThinkJS ������ ThinkJS ���������� ����������������� ������������� �� ES6/7 ������������ JavaScript Promise��� learn-es2015 ������� ��������� �������� � express/koa �� � sails �� ThinkJS ��� ES6/7 from './base.js'; export default class extends Base { /** * index action * @return {Promise} [] */ indexAction(){ //auto render template file index_index.html return this.display(); ERROR'); } } } JavaScript �� async/await ���� Promise ����� rejected Promise������������������ ����������� catch ������ resolve Promise ������ �����������success������� message � PREVENT_NEXT_PROCESS

from './base.js'; export default class extends Base { /** * index action * @return {Promise} [] */ indexAction(){ //auto render template file index_index.html return this.display(); async/await , if Promise returned a rejected Promise, an exception will be throwed. If it is not important and you want to ignore it, you can make the catch method to return a resolve Promise: After calling higher execution efficiency. For this, you can use Promise.all to implement it. p1 and p2 are processed parallelly and then get both data by using Promise.all . If your projects need to output data like

from './base.js'; export default class extends Base { /** * index action * @return {Promise} [] */ indexAction(){ //auto render template file index_index.html return this.display(); async/await , if Promise returned a rejected Promise, an exception will be throwed. If it is not important and you want to ignore it, you can make the catch method to return a resolve Promise: How To Open But mostly you want to excute parallely to have higher execution efficiency. For this, you can use Promise.all to implement it. export default class extends think.controller.base { async indexAction(){