Run results for: Map vs Obj Lookup

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser: Chrome 107

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Map	1501.7 Ops/sec
Obj	1609.1 Ops/sec

Script Preparation code:

var keys = [];
var map = new Map();
var obj = {};

for (let i = 0; i < 10000; i++) {
  const key = String.fromCharCode(i);
  keys.push(key);
  map.set(key, i);
  obj[key] = i;
}

Tests:

Map
keys.map(key => map.get(key))
Obj
keys.map(key => obj[key])