//flattening multidem arrays into one array
var ar = [1, 2, [3, 4, [5, 6, [7], ], 8], 9, 10, 11, 12];
//		 1       2      3      4 3   2
var newAr = [];
var tempAr =[];
function main(array){
	function arrayFn(array){
		for(var i=0; i < array.length; i++){
			if(Array.isArray(array[i]))
				arrayFn(array[i]);
			else
				newAr.push(ar[i]);
		}
		return newAr;
	}
	return arrayFn(array);
}
main(ar);