Run results for: set.has vs. array.includes vs obj[key] vs map.get 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.2 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
includes	1332.6 Ops/sec
hash	1650794.1 Ops/sec
set	1426514.6 Ops/sec
map	1395753.4 Ops/sec

Script Preparation code:

function shuffle(array) {
  let currentIndex = array.length,  randomIndex;

  // While there remain elements to shuffle...
  while (currentIndex != 0) {

    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex--;

    // And swap it with the current element.
    [array[currentIndex], array[randomIndex]] = [
      array[randomIndex], array[currentIndex]];
  }

  return array;
}

var a = shuffle(Array(100000).fill(undefined).map((_, i) => i));
var b = a.reduce((acc, el) => { acc[el] = true; return acc }, {});
var c = new Set(a);
var d = new Map(a.map(el => [el, true]));
var elements = [1, 100, 1000, 24, 56, 78, 23, 5643, 863, 2679, 9999, 45, 5832, 7510, 3756];

Tests:

includes
return elements.map(el => a.includes(el))
hash
return elements.map(el => b[el])
set
return elements.map(el => c.has(el))
map
return elements.map(el => d.get(el))

Run results for: set.has vs. array.includes vs obj[key] vs map.get 2

includes

hash

set

map