關於 promise then return value ，我們在網路上蒐集到這些相關的討論、資訊與評價

#11. Access the results of a promise — then • promises

However, what may be surprising is that the return value of then is also a (newly created) promise. This new promise waits for the original promise to be ...

#12. javascript promise then return value Code Example

function doSomething() { return new Promise((resolve, reject) => { console.log("It is done."); // Succeed half of the time. if (Math.random() > .5) ...

#13. Javascript: How to access the return value of a Promise object

But what if we'd like to use the returned value somewhere later in code? If we try to do it like this (wrong way!): const address = fetch ...

#14. 異步函數- 提高Promise 的易用性| Web

console.log('Received chunk', value); return reader.read().then(processResult); }) }); }. 請“Promise 大師”Jake Archibald 給我檢查一下。

#15. JavaScript | promise resolve() Method - GeeksforGeeks

If the value is a promise then promise is returned. · If the value has a “then” attached to the promise, then the returned promise will follow ...

#16. Promise Chaining in JavaScript

Returning a Promise ... When you return a value in the then() method, the then() method returns a new Promise that immediately resolves to the return value.

#17. Promise then return value

async functions are inherently asynchronous so they can't return a synchronous value. It should be noted that the core component of a promise object is the then ...

#18. JavaScript promises, mastering the asynchronous - Coding ...

In this code, we add a callback on the promise, then we return the promise. ... If you want to create an auto-resolved promise with a simple value, ...

#19. [教學] 如何使用JavaScript Promise 簡化非同步流程

這篇文章將會介紹promise 的resolve 和reject，如何使用then 串接非同步流程 ... 在promise裡面呼叫 resolve(value) ，或是 .then(function() {return ...

#20. JavaScript Promises: then(f,f) vs then(f).catch(f) - Dmitri Pavlutin

That might happen when the resolved value is invalid. Let's modify the success callback to return a rejected promise: javascript. function ...

#21. 然後咧？ ES6 Promise 的奇技淫巧 - 叡揚資訊

有趣的是，按Promise/A+ 規格2.2.7 小節， then 的參數（也就是onFulfilled ... 2.2.7.1 If either onFulfilled or onRejected returns a value x ...

#22. Promises and then function return values - Today I Learned

The return type of Promise function will dictate how future chained then functions behave. If you return a Promise then the next chained then ...

#23. Promise.then是如何實現鏈式呼叫的_向婉行

我們都知道， then 方法返回一個新的 promise 例項，這是實現鏈式呼叫的根本。 ... const result = onFulfilled(self.value); // 承前 return result ...

#24. How To Return Data From JavaScript Promise - Code Handbook

function getPromise(){ return new Promise(function(resolve ... So, if you return a promise from getResult method it can then be used to wait ...

#25. Ext JS 6.2.0 - Promise - Sencha Documentation

Each call to then returns a new Promise of that transformed value; i.e., a Promise that is resolved with the callback return value or rejected with any ...

#26. Promise JavaScript API - JavaScripture

If the return value from onResolve is a Promise, then() will wait for that Promise to be resolved. then() will resolve the Promise it returned with ...

#27. 25. Promises for asynchronous programming - Exploring JS

A Promise is a container for an asynchronously delivered value; 25.4.3. ... Chaining is simpler: If the callback of then() returns a Promise (e.g. the ...

#28. understandinges6/11-Promises.md at master - GitHub

Instead, the function returns a promise object representing the asynchronous ... But if you want a promise to represent just a single known value, then it ...

#29. 中的PromiseAWSSDK for PHP 的開發套件第3 版

$promise->then( function ($value) { echo "The promise was fulfilled with {$value}" ... If the previous callback returned a promise, then // this callback is ...

#30. Dojo Deferreds and Promises - Dojo Toolkit Tutorial

Callbacks cannot change the value produced by the promise; A promise's then method returns a new promise, to provide chaining while keeping the original ...

#31. C# Promise.Then方法代碼示例- 純淨天空

在下文中一共展示了Promise.Then方法的20個代碼示例，這些例子默認根據受歡迎程度排序。 ... Then(value => { throw expectedException; return Promise<int>.

#32. [JS] 理解Promise 狀態及使用方式| 搞搞就懂 - 點部落

function doSomethingAsync(){ return new Promise((resolve, ... value 值(可以從新Promise 物件 then 中onFulfilled 方法參數中取得); Promise 物件.

#33. Promise - 3.28 - Ember API Documentation

If this value is also a promise, then the original promise's settled state ... function getJSON(url) { return new Promise(function(resolve, reject){ let xhr ...

#34. 如何将Promise.then中的值直接return出来 - 腾讯云

p.then(value => { return value }) } result = foo() ... 正确的使用方式只能是： return 出 Promise 对象，然后在 .then 的执行体中处理异步请求 ...

#35. Promise.resolve - Bluebird JS

If value is not a thenable, a fulfilled Promise is returned with value as its ... Promise.resolve($.get("http://www.google.com")).then(function() ...

#36. node js return value from promise then code example

Example 1: javascript return promise function doSomething() { return new Promise((resolve, reject) => { console.log("It is done."); // Succeed half of the ...

#37. JavaScript Promise Chain - The art of handling promises

You may want to retrieve it synchronously from memory or cache. You can return a simple value from the .then() method than returning a promise ...

#38. JavaScript Promise.then() , how it works and what it returns?

We will use Promise.resolve() to create a new Promise and call .then() method to get the value. Let's say we have a variable p that holds the resolved Promise ...

#39. Promise.then method - Windows app development - Microsoft ...

Promise.then method. 01/26/2017; 2 minutes to read. In this article. Syntax; Parameters; Return value; Requirements; See also.

#40. 深入理解Promise運行原理 - 程式前沿

var promise = Promise.resolve(); promise.then(function() { return 'success'; }) ... 當調用 then() 時就可以通過調用傳入的回調函數處理value值。

#41. JavaScript Promise Tutorial – How to Resolve or Reject ...

Promises are important building blocks for asynchronous operations ... We then return that value and it will be passed as a promise to the ...

#42. 淺談promise（then、catch、resolve、reject - ITREAD01.COM

靜態方法Promise.resolve(value) 可以認為是new Promise() 方法的快捷方式。 ... return Promise.resolve(42).then(throwError).catch(onRejected); ...

#43. Order execution Promise - Programmer Sought

In the promise, then return remains a promise; then a value of the callback function will return as the current parameter values ​​for the method then calls ...

#44. javascript promise then return value - 掘金

javascript promise then return value技术、学习、经验文章掘金开发者社区搜索结果。掘金是一个帮助开发者成长的社区，javascript promise then return value技术文章 ...

#45. ES6 Promise 物件- JavaScript (JS) 教學Tutorial - Fooish 程式 ...

promise.then(function(value) { // 當狀態是fulfilled (成功) 時，執行這個 ... 如果return value 的型態不是Promise，會先執行Promise.resolve()。

#46. How to Use Promise.prototype.then() - Javascript - AppDividend

If it is not a function, it is internally replaced with a “Thrower” function (it throws an error it received as argument). Return Value. Then() ...

#47. Javascript Promise example 簡易實作模擬 - Ian Chu

declare arrow function return Promise // ** new Promise to ... 可以看到promise 內部的狀態，有status、value、then、catch、finally，這邊就先不 ...

#48. 2.6. 专栏: 每次调用then都会返回一个新创建的promise对象

// 1: 对同一个promise对象同时调用`then` 方法 var aPromise = new Promise(function (resolve) { resolve(100); }); aPromise.then(function (value) { return value * 2 ...

#49. Promise

userFormTemplate, userData)); // return a value to resolve the chained promise (aka uiUpdated) and pass // to the uiUpdated's then(onFulfilled) callback, ...

#50. Promise - Documentation

If they all succeed, then the returned promise will succeed, with the results being the ... Returns a new promise that is resolved with a given value.

#51. Understanding JavaScript Promises - Nodejs.dev

It returns a single promise that resolves with the value from the first promise that is fulfilled. If all promises are rejected, then the returned promise ...

#52. Promises in Node.js – An Alternative to Callbacks - StrongLoop

The core component of a promise object is its then method. The then method is how we get the return value (known as the fulfillment value) ...

#53. JavaScript Promises Tutorial with Angular 7/8 Example

If you have written any serious JavaScript code before, then you ... This an example of a simple promise object that returns I promise to ...

#54. Passing data between Promise callbacks - 2ality

We solve this problem by using Promise.all() to pass multiple values from the first callback to the second one: return asyncFunc1() .then( ...

#55. The Promise then() Function in JavaScript - Mastering JS

However, there's no way to get a promise's value from the promise directly - you ... The then() function returns a promise p , and if your ...

#56. 6 Ways to Use Promises in Your Javascript Code - Bits and ...

The then method on a resolved Promise will return a new Promise. ... Note: While the value stays the same, the method returns a new Promise ...

#57. Promise then method return value problem. - DDCODE

function double(value) { return value * 2; bracket function increment(value) { return new Promise(function(resolve, reject){ Resolve(value ...

#58. return value from promise then to parent function

In our example, the return value is from column D, Sales. ... The second Promise chain is nested inside the .then () callback starting in line B. About.

#59. Understanding Promise.all in JavaScript - LogRocket Blog

A promise is an object that will return a value in the future, it can either ... rejected — a promise is rejected if promise.then(undefined, ...

#60. 現代化的JavaScript 併發- Promises - Weihang Lo

任何code block 成功return 一個value，都會使得該promise 被fulfill。 asyncThing1().then(function() { return asyncThing2() }).then ...

#61. How to return the value in promise. Then directly - 文章整合

One 、 demand. Define a foo function , Performing asynchronous operations inside , And then get Promise.then The values in are not return ...

#62. What is the difference between then and finally in a JavaScript ...

On the surface, a JavaScript promise's then and finally methods seem very similar. ... Promise resolves to 11, the return value of then().

#63. Velo: Working with Promises | Help Center | Wix.com

Some people mistakenly expect that the value the Promise resolves to is used as the return value of the function that the then ...

#64. Promise.then方法的返回值问题 - 简书

var p1 = Promise.resolve(42) p1.then((value)=>{ //第一种情况，返回一个Promise return new Promise(function(resolve,rejected){ ...

#65. TypeScript 學習之路 第十四章：用Promise把非同步程式寫成 ...

這個章節我們要來探討JavaScript在ES6之後新增的「Promise」。 ... promise .then((stats) => { console.log(stats); return true; }) .catch((err) ...

#66. What's The Point Of Promises? - Telerik

The callback is then invoked and data is passed in as an argument to it. If the callback doesn't have a return value, the promise that was ...

#67. Tag : promise - Opass's Blog

判斷傳入的值是不是promise，如果是的話回傳該promise的then方法，可以注意到檢查方式很 ... var then = value.then; if (typeof then === 'function') { return then; } ...

#68. Introduction to ES6 Promises - 4 functions to avoid callback hell

new Promise(function(resolve) { resolve(); }).then(function() { return value; });.

#69. Resolving the JavaScript Promise Error "TypeError: Cannot ...

Hence, the undefined value is returned. ... Finally, then() returns a new Promise that resolves to JSON. But you may have noticed there is ...

#70. JavaScript 的同步與非同步- 從Callback function 到Promise

const result = fetch('https://www.example_api.php') .then(res => { return res.json() // 回傳promise }).then ( value => { // 拿到的就已經是被 ...

#71. 关于javascript：从那时返回值或Promise.resolve有什么区别（）

What's the difference between returning value or Promise.resolve from then()有什么区别：[cc lang=javascript]new Promise(function(res, ...

#72. Consuming a promise with .then() - Delicious Insights

Same thing for any returned value that is not itself a promise: it would get converted to a fulfilled promise, in order to allow the promise ...

#73. 从0到1实现Promise - SegmentFault 思否

let promise = new Promise((resolve, reject) => { resolve(123); }); promise.then((value) => { console.log('value1', value); return 456; }) ...

#74. Promise - ReactPHP

Each call to then() returns a new promise that will resolve with the return value of the previous handler. This creates a promise "pipeline". $deferred = new ...

#75. MDN: Promise.prototype.then() - 知乎专栏

JavaScript Demo: Promise.then() var promise1 = new ... "this gets called after the end of the main stack. the value received and returned is: 33" // Promise ...

#76. 淺談JavaScript 的Promise - 大類的技術筆記

本文會著重介紹ES2015 定義的原生Promise，除了基本的用法和個人使用心得外， ... 告白 (心儀妹子, 我) .then(function 牽手(女友) { return Promise.reject(new ...

#77. JavaScript Promises: an introduction - web.dev

You can transform values simply by returning the new value: Copy code var promise = new ... promise.then(function(val) {

#78. Node.js Promise Tutorial - Guru99

var promise = doSomethingAync() promise.then(onFulfilled, onRejected) ... Note: So the key aspect of a promise is the return value.

#79. Promise then returns a promise. Why does the next then ...

Why do you directly return apromise in the then of newpromise, and the res of the next then is not the apromise object. But its resolve value? What's the ...

#80. AngularJS: API: $q

If the value is a rejection constructed via $q.reject , the promise will be rejected ... Because calling the then method of a promise returns a new derived ...

#81. Creating a JavaScript promise from scratch, Part 3 - Human ...

The second then() call is actually on a second promise that is resolved using the return value from the preceding fulfillment handler. It's this ...

#82. Promises in Node.js - Stack Abuse

A Promise is an asynchronous function "giving its word" that a value will be returned at a later time. Introduced in ES6/ES2015, Promises ...

#83. JavaScript Promises Explained | Macadamian

Promises are chainable: 'then', 'catch' and any other function on a Promise return a Promise. The key point being that the chained order is ...

#84. Using Promises for Async Programming in JavaScript

We can return a value, which will be resolved and the value retrievable in the next then function. It can also throw an error. Then the promise ...

#85. Async and Await in JavaScript, the extension to a promise.

An async function simply implies that a promise will be returned and if ... it in a resolved promise with the return value in that function.

#86. HTTP Example with Promises • Angular - codecraft.tv

Then we make a GET request to that URL with: TypeScript. Copy this.http.get(apiURL). It return an Observable, we are working with Promises in this example ...

#87. 如何将Promise.then中的值直接return出来 - 文渊博客

Promise 如何返回值，而不是返回Promise对象_为什么Promise返回值一直都是undefined。 ... p.then(value => { return value }) } result = foo() ...

#88. Understanding Promise.Resolve() - Level Up Coding

The rule is, if a function that is inside a then handler returns the value, the promise resolves/rejects with that value. If a function returns ...

#89. JavaScript 同步延遲( Promise + setTimeout ) - OXXO.STUDIO

function asyncFunction(value) { return new Promise(function(resolve, ... 1000); }); } delay().then(function (value) { console.log(value); // '我是傳下去的 ...

#90. Detect if Value Is a Promise in Node.js and JavaScript - Future ...

then () method. A promise describes a placeholder for an asynchronous computation that only returns the value to a given callback if you call .

#91. 如何正确获得Promise方式后then返回值是值的本身而不是一个 ...

调用：var value=getdata().then(function(e){ console.log(e); // 打印结果显示：1 return e; // 返回给变量value=Promise对象（情况如下图，isLike ...

#92. JavaScript Promises: A Tutorial with Examples - Toptal

promise.then(function(value) { // Do something with the 'value' }); ... a promise, and each function in the promise chain gets called with the return value ...

#93. Using promise .then return promise and wrap previous response

As I understand, #code# returns a new promise. But how to return this promise with a value. Here is my sample code The log output Expected.

#94. Mojo::Promise - Mojolicious::Guides

Pass along the fulfillment value or rejection reason $promise->then( sub (@value) { say "The result is $value[0]"; return @value; } ...

#95. Promise(executor) - Mithril

Promise chaining. Promises can be chained. Returning a value from a then callback makes it available as the argument to the next then callback.

#96. Passing more than single value through promise chain - Gleb ...

Promises are fulfilled (resolved or rejected) with a single value. If we need to keep track of multiple values we can return several values ...

#97. deferred.then() | jQuery API Documentation

fail() callbacks, or they can return another observable object (Deferred, Promise, etc) which will pass its resolved / rejected status and values to the ...

#98. API Reference - Promises

all(iterable). Returns a Promise that waits for all promises in the iterable to be fulfilled and is then fulfilled with an array of those resulting values ( ...