JavaScript Array flatMap()
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definition and usage
flatMap() the method performs mapping operations on each element of the array and creates a new flattened array.
flatMap() create a new array by calling a function for each array element.
flatMap() does not execute the function for empty array elements.
flatMap() does not change the original array.
see also:
example
const myArr = [1, 2, 3, 4, 5, 6]; const newArr = myArr.flatMap(x => [x, x * 10]);
syntax
array.flatMap(function(currentValue, index, arr) thisValue)
parameter
| parameter | description |
|---|---|
| function() | required. The 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 to which the current element belongs. |
| thisValue |
optional. The value passed to the function this. the default value is undefined. |
return value
| type | description |
|---|---|
| array | array, including the result elements of the callback function, and flatten it. |
browser support
Starting from January 2020, all modern browsers support JavaScript array flatMap() method:
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome 69 | Edge 79 | Firefox 62 | Safari 12 | Opera 56 |
| September 2018 | January 2020 | September 2018 | September 2018 | September 2018 |
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