How to find the sum of an array of numbers

Question

Given an array [1, 2, 3, 4], how can I find the sum of its elements? (In this case, the sum would be 10.)

I thought $.each might be useful,

Answer 1

This is much easier

function sumArray(arr) {
    var total = 0;
    arr.forEach(function(element){
        total += element;
    })
    return total;
}

var sum = sumArray([1,2,3,4])

console.log(sum)