Run results for: set.has vs. array.includes (find 999,999 in 1,000,000)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Linux

Device Platform: Desktop

Date tested: one month ago

lookup

2024.8M/s

includes

1K/s

View exact numbers

Test name	Executions per second
✓ lookup	2,024,766,976 Ops/sec
includes	1,005 Ops/sec

Script Preparation code:

var a = Array.from({length: 1000000}, (val, index) => index);
var b = new Set(a)

Tests: