flatMap()

Use flatMap() creates a new array with sub-array elements flattened by specified depth.

example

[[2], [4], [6], [8]].flatMap(val => val/2) // [ 1, 2, 3, 4 ]

syntax

var new_array = arr.flatMap(function callback(currentValue[, index[, array]]) {
 // return element for new_array
}[, thisArg])

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Using the spread operator during an Object declaration will assign the properties of the referenced Object to the new Object.

How to combine two sorted arrays into one? We can do this easily with the spread operator.

Use flatMap() creates a new array with sub-array elements flattened by specified depth.