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Run results for: Set.has vs Array.includes Large Collections

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36 Edg/91.0.864.59
Chrome 91
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
Set.has (1,000 items) 24836.6 Ops/sec
Array.includes (1,000 items) 24764.0 Ops/sec
Tests:

  • Set.has (1,000 items)

    ​x
     
    const myArray = [];
    for (let i = 0; i < 1000; i++) {
      myArray.push(i);
    }
    ​
    const mySet = new Set(myArray);
    const contains = mySet.has(999);

  • Array.includes (1,000 items)

     
    const myArray = [];
    for (let i = 0; i < 1000; i++) {
      myArray.push(i);
    }
    ​
    const mySet = new Set(myArray);
    const contains = myArray.includes(i) ? true : false;