MeasureThat.net

Run results for: Convert Array to Object - Compare all possible4

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36
Chrome 102
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
Object.fromEntries 2083.2 Ops/sec
Reduce (reuse object) 11273.2 Ops/sec
Reduce (creating temporary objects) 110.4 Ops/sec
Map 1915.1 Ops/sec
forEach 11514.9 Ops/sec
for of 12648.8 Ops/sec
for i 1244.0 Ops/sec
for i saved length variable 2267.3 Ops/sec
Script Preparation code:
AخA
 
var data = Array.from(Array(10000).keys()).map(i => ({id: i, value: `val_${i}`}));
Tests:

  • Object.fromEntries

     
    Object.fromEntries(data.map(obj => [obj.id, obj]));

  • Reduce (reuse object)

     
    data.reduce((acc, obj) => {
      acc[obj.id] = obj;
      return acc;
    }, {});

  • Reduce (creating temporary objects)

     
    data.reduce((acc, obj) => ({
      ...acc,
      [obj.id]: obj
    }), {});

  • Map

     
    new Map(data.map(obj => [obj.id, obj]));

  • forEach

     
    const res = {};
    data.forEach(obj => {
        res[obj.id] = obj; 
    });

  • for of

     
    const res = {};
    for (const obj of data) {
        res[obj.id] = obj; 
    }

  • for i

     
    const res = {};
    for (let i = 0; i < data.length; i++) {
        const obj = data[i];
        res[obj.id] = obj; 
    }

  • for i saved length variable

     
    const res = {};
    const length = data.length;
    for (let i = 0; i < length; i++) {
        const obj = data[i];
        res[obj.id] = obj; 
    }