Javascript return all indexes of highest values in an array

Question

I'm trying to get the indexes of 'all' the highest values in an array:

[0,1,4,3,4]

Need to get back [2,4] as a result.

Update: Thanks everyone for the quick responses. After reading some of the earlier comments, it spawned this path for me:

var array = [0,1,4,3,4];
var indexes = [];
var highest = Math.max(...array);

array.forEach(function(element, i) {
    if (element == highest) {
        indexes.push(i);
    }
});

I know it's a bit verbose, but it makes sense to me. I better read up on 'reduce'.

Answer 1

Using Math.max you can get the maximum element. Post that you map over the array and get the indices of this max element. The complexity of this approach is O(n);

const arr = [0,1,4,3,4];
const max = Math.max(...arr);
const res = [];
arr.forEach((item, index) => item === max ? res.push(index): null);
console.log(res);