Run results for: Array vs object

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Array

6.0M/s

Object

3.7M/s

View exact numbers

Test name	Executions per second
✓ Array	6,011,894 Ops/sec
Object	3,685,167 Ops/sec

Script Preparation code:

var n = 80;
var a = [];
var obj = {};
for (var i=0; i<a.length; i++) {
  a[i] = i;
  obj["obj" + i] = i;
}

Tests:

Array
r = Math.floor(Math.random()*n); for (var i=0; i<a.length; i++) { if (a[i] == r) break; }
Object
r = Math.floor(Math.random()*n); var i = obj["obj"+r];