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Run results for: Object.fromEntries vs reduce vs for of #1000

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36
Chrome 118
Windows
Desktop
one year ago
Test name Executions per second
Object.fromEntries 360.2 Ops/sec
Reduce (reuse object) 3703.5 Ops/sec
Reduce (creating temporary objects) 140.4 Ops/sec
for of 3773.1 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]));

  • 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

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