Run results for: Set vs Object lookup

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Object

9.4M/s

Set

9.3M/s

View exact numbers

Test name	Executions per second
✓ Object	9,410,374 Ops/sec
Set	9,279,775 Ops/sec

Script Preparation code:

var set = new Set();
var object = {};
var array = new Array(5000).fill().map((_, i) => i);

for (let i = 0; i < array.length; i++) {
  object[i] = true;
}

for (let i = 0; i < array.length; i++) {
  set.add(i);
}

Tests:

Object
object[40]
Set
set.has(40)