JavaScript Array flatMap()
Example
const myArr = [1, 2, 3, 4, 5, 6];
const newArr = myArr.flatMap(x => [x, x * 10]);
Try it Yourself »const newArr = myArr.flatMap(x => [x, x * 10]);
Description
TheflatMap() method maps all array elementsand creates a new flat array.
flatMap() creates a new array from calling a function for every array element.
flatMap() does not execute the function for empty elements.
flatMap() does not change the original array.
See Also:
Syntax
array.flatMap(function(currentValue, index, arr), thisValue)
Parameters
| Parameter | Description |
| function() | Required. A function to be run for each array element. |
| currentValue | Required. The value of the current element. |
| index | Optional. The index of the current element. |
| arr | Optional. The array of the current element. |
| thisValue | Optional. Default value undefined.A value passed to the function to be used as its this value. |
Return Value
| Type | Description |
| An array | An array with the elements as a result of a callback function and then flattened. |
Array Tutorials:
Browser Support
JavaScript ArrayflatMap() is supported in all modern browsers since January 2020:
| Chrome 69 | Edge 79 | Firefox 62 | Safari 12 | Opera 56 |
| Sep 2018 | Jan 2020 | Sep 2018 | Sep 2018 | Sep 2018 |
