Run results for: Sets, Objects, Arrays Performance

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 14

Operating system: iOS 14.2

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Set	625.1 Ops/sec
Object	618.0 Ops/sec
Array	85.5 Ops/sec

Script Preparation code:

var set = new Set();
var object = Object.create(null);
var array = [];
var size = 1000;
array.length = size;

var test = (function (length, probability) {
  function random() {
    return Math.random().toString(36).substr(2);
  }
  var i;
  
  for (i = 0; i < size; i++) {
    var str = random();
    set.add(str);
    object[str] = true;
    array[i] = str;
  }
  
  var test = [];
  test.length = length;
  var c = size / probability;
  for (i = 0; i < length; i++) {
    var index = Math.floor(Math.random() * c);
    test[i] = index < size ? array[index] : random();
  }
  return test;
})(10000, 0.5);

Tests:

Set
var count = 0; for (var i = 0; i < test.length; i++) { if (set.has(test[i])) { count++; } }
Object
var count = 0; for (var i = 0; i < test.length; i++) { if (!!object[test[i]]) { count++; } }
Array
var count = 0; for (var i = 0; i < test.length; i++) { if (array.includes(test[i])) { count++; } }