Run results for: Map vs Object.create(null)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
Map lookup	5773.1 Ops/sec
Obj lookup	6475.2 Ops/sec

Script Preparation code:

var map = new Map();
var obj = Object.create(null);

for (let i = 0; i < 20; ++i) {
  map.set(i, i)
  obj[i] = i
}

var i = 0, count = 1000, a;

​x
 
var map = new Map();var obj = Object.create(null);​for (let i = 0; i < 20; ++i) {  map.set(i, i)  obj[i] = i}​var i = 0, count = 1000, a;

Tests:

for (i = 0; i < count; i++) {
  a = map.get(i % 20);
}

 
for (i = 0; i < count; i++) {  a = map.get(i % 20);}

for (i = 0; i < count; i++) {
  a = obj[i % 20];
}

 
for (i = 0; i < count; i++) {  a = obj[i % 20];}