JavaScript Promise then()

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Example

myPromise.then(x => myDisplay(x), x => myDisplay(x));
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Description

The then() method provides two callbacks:

One funtion to run when a promise is fulfilled and one funtion to run when a promise is rejected.

Syntax

promise.then(fulfilled(), rejected())

Parameters

fulfilled() Function to run when the promise is fulfilled
rejected() Function to run when the promise is rejected

Return Value

Type Description
Object A new Promise Object

Related Pages:

Promise Tutorial

catch()

finally()

then()

Browser Support

then() is an ECMAScript6 (ES6) feature.

ES6 (JavaScript 2015) is supported in all modern browsers since June 2017:

Chrome 51 Edge 15 Firefox 54 Safari 10 Opera 38
May 2016 Apr 2017 Jun 2017 Sep 2016 Jun 2016

then() is not supported in Internet Explorer.


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