Run results for: Object vs Map, literal keys

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: 5 months ago

Test name	Executions per second
non-initialized object	5756612.0 Ops/sec
initialized object	5748819.0 Ops/sec
map	319350.3 Ops/sec

HTML Preparation code:

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

Script Preparation code:

const o1 = {};

const o2 = {
  key0: 0,
  key1: 0,
  key2: 0,
  key3: 0,
  key4: 0,
  key5: 0,
  key6: 0,
  key7: 0,
  key8: 0,
  key9: 0,
};

const m = new Map();

Tests:

non-initialized object
for (let n = 0; n < 50; n++) { if (n === 0) { o1.key0 = 0; o1.key1 = 0; o1.key2 = 0; o1.key3 = 0; o1.key4 = 0; o1.key5 = 0; o1.key6 = 0; o1.key7 = 0; o1.key8 = 0; o1.key9 = 0; } else { o1.key0 += 1; o1.key1 += 1; o1.key2 += 1; o1.key3 += 1; o1.key4 += 1; o1.key5 += 1; o1.key6 += 1; o1.key7 += 1; o1.key8 += 1; o1.key9 += 1; } }
initialized object
for (let n = 0; n < 50; n++) { if (n === 0) { o2.key0 = 0; o2.key1 = 0; o2.key2 = 0; o2.key3 = 0; o2.key4 = 0; o2.key5 = 0; o2.key6 = 0; o2.key7 = 0; o2.key8 = 0; o2.key9 = 0; } else { o2.key0 += 1; o2.key1 += 1; o2.key2 += 1; o2.key3 += 1; o2.key4 += 1; o2.key5 += 1; o2.key6 += 1; o2.key7 += 1; o2.key8 += 1; o2.key9 += 1; } }
map
for (let n = 0; n < 50; n++) { if (n === 0) { m.set('key0', 0); m.set('key1', 0); m.set('key2', 0); m.set('key3', 0); m.set('key4', 0); m.set('key5', 0); m.set('key6', 0); m.set('key7', 0); m.set('key8', 0); m.set('key9', 0); } else { m.set('key0', m.get('key0') + 1); m.set('key1', m.get('key1') + 1); m.set('key2', m.get('key2') + 1); m.set('key3', m.get('key3') + 1); m.set('key4', m.get('key4') + 1); m.set('key5', m.get('key5') + 1); m.set('key6', m.get('key6') + 1); m.set('key7', m.get('key7') + 1); m.set('key8', m.get('key8') + 1); m.set('key9', m.get('key9') + 1); } }

Run results for: Object vs Map, literal keys

non-initialized object

initialized object

map