Run results for: Map vs Object 5000 rand

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1

Device Platform: Mobile

Date tested: one year ago

Obj lookup

1K/s

Map lookup

1K/s

View exact numbers

Test name	Executions per second
✓ Obj lookup	1,042 Ops/sec
Map lookup	1,020 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};
function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}   
for(let i = 0 ; i < 5000 ; i++){
  const randomNm = getRandomInt(10000);
  map.set(randomNm, randomNm);
  obj[randomNm] = randomNm;
}

var i = 0, count = 1000, a;

Tests:

Map lookup
for(let i = 0 ; i < 5000 ; i++){ const randomNm = getRandomInt(10000); a = map.get(randomNm); }
Obj lookup
for(let i = 0 ; i < 5000 ; i++){ const randomNm = getRandomInt(10000); a = obj[randomNm]; }

Run results for: Map vs Object 5000 rand

Lookup of map vs object

Map lookup

Obj lookup