Run results for: Object key vs Array index access

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Array

14.1M/s

Object

13.9M/s

View exact numbers

Test name	Executions per second
✓ Array	14,085,418 Ops/sec
Object	13,893,926 Ops/sec

Script Preparation code:

var obj = {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9, 10: 10, 11: 11, 12: 12, 13: 13, 14: 14, 15: 15, 16: 16, 17: 17, 18: 18, 19: 19}
var arr = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]

Tests:

Object
obj[19]
Array
arr[19]