Run results for: map vs obj vs array

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/111.0.5563.72 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 111

Operating system: iOS 16.3

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
map	58.2 Ops/sec
array	58.5 Ops/sec
obj	61.6 Ops/sec

Script Preparation code:

var i = 0, count = 100000, a;
var map = new Map();
var array = [];
var obj = {};

for (i = 0; i < count; i++) {
  const randomValue = ~~(Math.random() * 100);
  map.set(i, randomValue);
  array.push({id: i, randomValue});
  obj[i] = randomValue;
}

Tests:

map
for (i = 0; i < count; i++) { a = map.get(i); }
array
for (i = 0; i < count; i++) { a = array.find(el => el.id = i); }
obj
for (i = 0; i < count; i++) { a = obj[i] }