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

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser: Chrome 84

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array indexOf	3957941.0 Ops/sec
String indexOf	4270240.0 Ops/sec
Object lookup	4294135.0 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];

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

Array indexOf

String indexOf

Object lookup