Javascript Return New Promise Example

JavaScript Promises W3Schools

Let myPromise new Promise function myResolve myReject quot Producing Code quot May take some time myResolve when successful myReject when error quot Consuming Code quot Must wait for a fulfilled Promise myPromise then function value code if successful function error code if some error

Promise JavaScript MDN MDN Web Docs, Each then returns a newly generated promise object which can optionally be used for chaining for example js const myPromise new Promise resolve reject gt setTimeout gt resolve quot foo quot 300 myPromise then handleFulfilledA handleRejectedA then handleFulfilledB handleRejectedB then handleFulfilledC

Using Promises JavaScript MDN MDN Web Docs

const promise new Promise resolve reject gt console log quot Promise callback quot resolve then result gt console log quot Promise callback then quot setTimeout gt console log quot event loop cycle Promise fulfilled quot promise 0 console log quot Promise pending quot promise

Javascript Return Promise From The Function Stack Overflow, function test return returnPromise then value gt console log 1st then inside test value return Hello then value gt console log 2nd then inside test value return world function returnPromise return new Promise function resolve reject resolve start of new Promise test then

Understanding new Promise In JavaScript Mastering JS

Understanding new Promise In JavaScript Mastering JS, You don t need to create new promises very often Usually libraries like Axios or Mongoose create promises internally and return them so you can use then or await However not all APIs support promises For example the setTimeout function only accepts callbacks

Node js Promise Async Await

Promise The Modern JavaScript Tutorial

Promise The Modern JavaScript Tutorial let promise new Promise resolve reject gt setTimeout gt reject new Error quot Whoops quot 1000 catch f is the same as promise then null f promise catch alert shows quot Error Whoops quot after 1 second The call catch f is a complete analog of then null f it s just a shorthand

Promise Js

Parallel Promises

The Promise resolve static method quot resolves quot a given value to a Promise If the value is a promise that promise is returned if the value is a thenable Promise resolve will call the then method with two callbacks it prepared otherwise the returned promise will be fulfilled with the value Promise resolve JavaScript MDN MDN Web Docs. Here we are calling the fetch API and assigning the return value to the fetchPromise variable immediately after logging the fetchPromise variable This should output something like Promise lt state gt quot pending quot telling us that we have a Promise object and it has a state whose value is quot pending quot js const p2 new Promise resolve reject gt resolve 1 p2 then value gt console log value 1 return value 1 then value gt console log value quot A synchronous value works quot 2 A synchronous value works p2 then value gt console log value 1

Parallel Promises

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