Run results for: Object vs Map 2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 26

Operating system: iOS 18.7

Device Platform: Mobile

Date tested: 8 months ago

initialized object

36K/s

non-initialized object

36K/s

map

22K/s

View exact numbers

Test name	Executions per second
✓ initialized object	36,421 Ops/sec
non-initialized object	36,253 Ops/sec
map	21,577 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const o1 = {};

const m = new Map();

const keys = [];
for (let i = 0; i < 100; i++) {
  keys.push('key' + i);
}

const o2 = {};
for (key of keys) {
  o2[key] = 0;
}

Tests:

non-initialized object
for (let n = 0; n < 50; n++) { for (let i = 0; i < 100; i++) { const key = keys[i]; if (n === 0) { o1[key] = 0; } else { o1[key] += 1; } } }
initialized object
for (let n = 0; n < 50; n++) { for (let i = 0; i < 100; i++) { const key = keys[i]; if (n === 0) { o2[key] = 0; } else { o2[key] += 1; } } }
map
for (let n = 0; n < 50; n++) { for (let i = 0; i < 100; i++) { const key = keys[i]; if (n === 0) { m.set(key, 0); } else { m.set(key, m.get(key) + 1); } } }