Flatten Multidimensional Arrays

flatten.js

'use strict';

const arr = [1,[2],[[3]],[[[4]]]]; //example Array

//Solution one - classic
let flatArr = [];
const flatten = (elem) => {
	if (Array.isArray(elem)) return elem.forEach(flatten);
	return flatArr.push(elem);
};
arr.forEach(flatten);
console.log('Solution one: ');
console.log(flatArr);


//Solution two - clever clogs
flatArr = arr.toString().split(',').map(el => parseInt(el));
console.log('Solution two: ');
console.log(flatArr);