Run results for: Set vs Object

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.3.1

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Has Set

552.6M/s

Has Object

487.7M/s

View exact numbers

Test name	Executions per second
✓ Has Set	552,629,696 Ops/sec
Has Object	487,664,064 Ops/sec

Script Preparation code:

var a = ['ab', 'cd', 'ef', 'gh'];
var s = new Set(a);
var d = {};
a.forEach(val => {
  d[val] = true;
});

Tests: