FlattenArray.js

// Recursive function to flatten out a multi-dimensional array
function FlattenArray(arr) {
	var newArr = [];
	for (var i = 0; i < arr.length; i++) {
	  // Go through each elements of array, if element is array, call this function with it as parameter and then concatenate
	  // with the new array, else just add the element to the new array, then return the new array in the end
		if (Array.isArray(arr[i])) {
			newArr = newArr.concat(FlattenArray(arr[i]));
		}
		else {
			newArr.push(arr[i]);
		}
	}
	return newArr;
}