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])

Getting the last element of a split string array

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Rest Operator for Objects

Now we can use rest on the properties of an Object. It allows us to explicitly extract certain named variables, and assign any uncalled variables into a catchall Object.

flatMap()

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

10 mẹo sử dụng array và object trong javascript