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This article mainly introduces what is the use of Array.forEach (). It is very detailed and has a certain reference value. Interested friends must finish reading it!

Arr .forEach (callback (currentValue [, index [, array]]) [, thisArg])

The functions that callback performs on each element. It accepts one to three parameters:

The current element being processed in the currentValue array.

The index in the index optional currentValue array.

The array optional array forEach () is called.

The value callback that the thisArg optional this is used as when executed.

Flattened array

Function flatten (arr) {

Const result = []

Arr.forEach ((I) = > {

If (Array.isArray (I)) {

Result.push (... flatten (I))

} else {

Result.push (I)

}

})

Return result

}

/ / Usage

Const nested = [1,2,3, [4,5, [6,7], 8,9]]

Flatten (nested) / / [1,2,3,4,5,6,7,8,9]

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