Get the array key with the highest value in javascript

Question

I have a array like

arr[1] = 234;
arr[2] = 345;
...

arr[40] = 126;

How can I get the index of the element with the highest value without reiterating the array?

Answer 1

You can apply Math.max and pass the array as its arguments-

arr.indexOf(Math.max.apply(window,arr))

But now Math.max is doing the iterating, just as sort would do.

Somebody has to look at each item in an unsorted array...