Benchmark: test reduce with rest vs from entries vs reduce without new object2

Script Preparation code:

function generateTestData(size) {
  const testData = [];
  for (let i = 0; i < size; i++) {
    const key = `key_${i}`;
    const values = [];
    for (let j = 0; j < size; j++) {
      values.push(`value_${i}_${j}`);
    }
    testData.push({ key, values });
  }
  return testData;
}

var testData = generateTestData(1000);

Tests:

reduce with new object
const result = testData.reduce((res, { key, values }) => ({ ...res, [key]: values }), {});
fromEntries
const result = Object.fromEntries(testData.map(({ key, values }) => [key, values]));
reduce without new object
const result = testData.reduce((res, { key, values }) => { res[key] = values; return res; }, {});
forEach
const results = {} testData.forEach(({ key, values }) => { results[key] = values; });
for
const result = {}; for (let i = 0; i < testData.length; i++) { const { key, values } = testData[i]; result[key] = values; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce with new object
fromEntries
reduce without new object
forEach
for

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
reduce with new object	10.2 Ops/sec
fromEntries	2744.8 Ops/sec
reduce without new object	4109.1 Ops/sec
forEach	4166.8 Ops/sec
for	2730.1 Ops/sec

test reduce with rest vs from entries vs reduce without new object2 (version: 9)

Comparing performance of: reduce with new object vs fromEntries vs reduce without new object vs forEach vs for

Created: 10 months ago by: Registered User

Jump to the latest result

reduce with new object

fromEntries

reduce without new object

forEach

for

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A