ZTM 2020 Clean the room challenge

cleanTheRoom.js

// Question 1: Clean the room function: given an input of [1,2,4,591,392,391,2,5,10,2,1,1,1,20,20], 
// make a function that organizes these into individual array that is ordered. For example 
// answer(ArrayFromAbove) should return: [[1,1,1,1],[2,2,2], 4,5,10,[20,20], 391, 392,591]. 
// Bonus: Make it so it organizes strings differently from number types. i.e. [1, "2", "3", 2] 
// should return [[1,2], ["2", "3"]]

function clean(arr) {
	let i = 0;
	let pos = 0;
	let duplicateArray = [];
	let newArray = [];
	arr.sort((a, b) => a - b);
	while (i < arr.length) {
		if ( arr[0] === arr[1] ) {
			pos = arr.lastIndexOf(arr[0]) + 1;
			duplicateArray = arr.splice(0, pos);
			newArray.push(duplicateArray);
		} else {
			newArray.push(arr[0]);
			arr.shift();
		}
	}
	return newArray;
}
console.log(clean([1,2,4,591,392,391,2,5,10,2,1,1,1,20,20]));


// thank Luckerella for the code. https://gist.github.com/Luckerella