Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36
Chrome 101
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
includes 21300182.0 Ops/sec
lookup 23212226.0 Ops/sec
Script Preparation code:
x
 
var a = Array.from({
    length: 1000
}, (_, i) => i + 1)
var b = new Set(a)
Tests:
  • includes

     
    return a.includes(900)
  • lookup

     
    return b.has(900)