flattenarray-node flatten a array of elemts given install npm install flattenarray-node Use const flatten = require('flattenarray-node')let arrayToFlatten = [[1,2,[3]],4]flatten(arrayToFlatten)// -> [1,2,3,4] API flatten(arrayToFlatten [, arrayFlatten]) Receive the array to be flatten and the array where store the array flatten.