//rewrite this sum function so that it uses a loop instead of recursion

function sum(l) {

    if (l.length === 0) {

        return 0;

    } else {

        return l[0] + sum(l.slice(1));

    }

}

​

console.log(`sum([1,2,3,4]) = ${sum([1,2,3,4])}`); //should be 10

​