Run results for: Array.indexOf vs String.indexOf vs Object lookup

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0

Browser: Firefox 123

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

String indexOf

1305.4M/s

Object lookup

1265.6M/s

Array indexOf

24.5M/s

View exact numbers

Test name	Executions per second
✓ String indexOf	1,305,352,960 Ops/sec
Object lookup	1,265,616,512 Ops/sec
Array indexOf	24,526,660 Ops/sec

Script Preparation code:

var o = {'ff1234567890121':0, 'ff1234567890122':1, 'ff1234567890123':2, 'ff1234567890124':3, 'ff1234567890125':4};
var a = ['ff1234567890121', 'ff1234567890122', 'ff1234567890123', 'ff1234567890124', 'ff1234567890125'];
var s = '-ff1234567890121--ff1234567890122--ff1234567890123--ff1234567890124--ff1234567890125-';
var t = 'ff1234567890124';

Tests:

Array indexOf
var i = a.indexOf(t);
String indexOf
var i = s.indexOf('-' + t + '-');
Object lookup
var i = o[t];