javascript - How to concatenate an array of number into one total number? -

i'm trying take array of length of ints, , concatenate single number total added up. instance, if have array goes follows: [2, 2] want becomes [4].

i'm using loop generate array using .push() on checkboxes , require total add equation.

i'm trying price array:

for(var i=0; < toppings.length; i++){ // creates loop data            if(toppings[i].checked) { //if checked               storeextnames += products[productslist.selectedindex].extra[i].name + " ";               storeextprice.push(products[productslist.selectedindex].extra[i].price);            }//end if         }//end loop 

you loop through array this:

var arr = [ 1, 2, 3, 4, 5, 6 ]; while (arr.length > 1) {     arr[0] += arr.pop(); }