JavaScript Promise then()
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Definition and usage
then() The method provides two callback functions:
One is executed when the Promise is successful, and one is executed when the Promise is rejected.
Example
myPromise.then(x => myDisplay(x), x => myDisplay(x));
Syntax
promise.then(fulfilled(), rejected())
Parameters
| Parameters | Description |
|---|---|
| fulfilled() | Function to be executed when the Promise is successful. |
| rejected() | Function to be executed when the Promise is rejected. |
Return value
| Type | Description |
|---|---|
| Object | New Promise object. |
Browser support
then() Is a feature of ECMAScript 6 (ES6).
Since June 2017, ES6 (JavaScript 2015) is supported in all modern browsers:
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome 51 | Edge 15 | Firefox 54 | Safari 10 | Opera 38 |
| May 2016 | April 2017 | June 2017 | September 2016 | June 2016 |
then() Not supported by Internet Explorer.
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