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Run results for: Object.create(null) vs {} unknown property

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Chrome 121
Mac OS X 10.15.7
Desktop
one year ago
Test name Executions per second
Object.create(null); 406.7 Ops/sec
{} 353.6 Ops/sec
key in Object.create(null) 405.1 Ops/sec
key in {} 336.2 Ops/sec
Tests:

  • Object.create(null);

    ​x
     
    const obj = Object.create(null);
    const result = [];
    ​
    for (i = 0; i < 100_000; i++) {
      result.push(obj[i]);
    }

  • {}

     
    const obj = {};
    const result = [];
    ​
    for (i = 0; i < 100_000; i++) {
      result.push(obj[i]);
    }

  • key in Object.create(null)

     
    const obj = Object.create(null);
    const result = [];
    ​
    for (i = 0; i < 100_000; i++) {
      result.push(i in obj);
    }

  • key in {}

     
    const obj = {};
    const result = [];
    ​
    for (i = 0; i < 100_000; i++) {
      result.push(i in obj);
    }