MeasureThat.net

Run results for: Object.fromEntries vs reduce vs Map (fixed Object.fromEntries)

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.51
Chrome 114
Windows
Desktop
one year ago
Test name Executions per second
Object.fromEntries 445.4 Ops/sec
Reduce (reuse object) 744.3 Ops/sec
Reduce (creating temporary objects) 28.1 Ops/sec
Map 802.0 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()
    }), {});

  • Map

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