Run results for: set.has vs. array.includes vs array.indexOf (string values)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 7 months ago

Benchmark engine: Benchmark.js

indexof

833.2M/s

lookup

769.8M/s

includes

744.4M/s

View exact numbers

Test name	Executions per second
✓ indexof	833,175,360 Ops/sec
lookup	769,818,944 Ops/sec
includes	744,410,624 Ops/sec

Script Preparation code:

var a = [
  'height',
  'width',
  'maxHeight',
  'maxWidth',
  'maxHeight',
  'minWidth',
  'color',
  'bg',
  'backgroundColor',
  'opacity',
  'm',
  'mt',
  'mb',
  'mr',
  'mr',
  'mx',
  'my',
  'p',
  'pt',
  'pb',
  'pr',
  'pl',
  'px',
  'py',
  'border',
  'boxShadow',
  'flex',
  'verticalAlign',
  'textAlign',
  'overflow',
  'display',
  'cursor'
];
var b = new Set(a)

Tests:

includes
return a.includes('mx')
lookup
return b.has('mx')
indexof
return a.indexOf('mx') >= 0