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Run results for: Object.fromEntries vs reduce vs for of

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.1 Safari/605.1.15
Safari 15
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
Object.fromEntries 187.1 Ops/sec
Reduce (reuse object) 410.9 Ops/sec
Reduce (creating temporary objects) 0.2 Ops/sec
for of 212.8 Ops/sec
Script Preparation code:
AخA
 
var data = { ...Array.from(Array(10000).keys()) };
Tests:

  • Object.fromEntries

     
    Object.fromEntries(Object.entries(data).map((key, value) => [key, value.toString()]));

  • Reduce (reuse object)

     
    Object.entries(data).reduce((acc, [k, v]) => {
      acc[k] = v.toString();
      return acc;
    }, {});

  • Reduce (creating temporary objects)

     
    Object.entries(data).reduce((acc, [k, v]) => ({
      ...acc,
      [k]: v.toString()
    }), {});

  • for of

    ​x
     
    const acc = {};
    ​
    for(const [k, v] of Object.entries(data)) {
      acc[k] = v.toString();
    }