Function to compute sum of all array elements in JavaScript

Took 2 minutes and 33 seconds to code a method to compute the sum of all elements of the array in JavaScript. Here is the code snippet.

Code:

arr = [1, 2, 3, 4];

function arrSum(arr) {

sum = 0;

for (var i = 0; i < arr.length; i++) {

sum += arr[i];

}

return sum;

}

document.write(arrSum(arr));

Result:

10