Get max / min from array of strings (javascript)

Any ideas to calculate min / max from array of strings?

var arr = ['aab','aac','aad','abx'];

So far i have considered to use .sort() function depending max / min, and get first element of result.

But maybe you know better preforming solution?

EDIT: Array size is below 1k elements. By Min /max i meant alphabetic sort: first and last element.

Answer

Iterate through your list and update min and max in each iteration step

function getMinMax(arr) {
  if (!arr) {
    return null;
  }
  var minV = arr[0];
  var maxV = arr[0];
  for (a of arr) {
    if (a < minV) minV = a;
    if (a > maxV) maxV = a;
  }
  return [minV, maxV];
}

console.log(getMinMax(['abc', 'aaa', 'abb']));

It should be much faster than sort() for large arrays. This algorithm is O(n) while sort() is at least O(n log(n)).