Run results for: Map vs Object Access Speed

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.3.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Map lookup	7069.9 Ops/sec
Obj lookup	6550.3 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};

let entry_num = 1000000;
let round_num = entry_num * 100;
for (i = 0; i < entry_num; i++) {
  let a = (Math.random() * round_num) % round_num;
  a = map.set("" + a, {});
  obj["" + a] = {};
}

map.set('a', 5);
obj['a'] = 5;

var i = 0, count = 1000, a;

Tests:

Map lookup
for (i = 0; i < count; i++) { a = map.get('' + i); }
Obj lookup
for (i = 0; i < count; i++) { a = obj['' + i]; }

Run results for: Map vs Object Access Speed

Lookup of map vs object

Map lookup

Obj lookup