Benchmark: JavaScript spread operator vs Object.assign vs mutation performance with condition #7

Tests:

Using the spread operator
const firstObject = { a: 'a', b: 'b', c: 'c', d: 'd', e: 'e', f: 'f', g: 'g' } const secondObject = { 0: 0, 1: 1, 2: 2, 3: 3, 4: '4', 5: '5', 6: '6', 7: '7' } const conditionState = Boolean(Object.keys(secondObject).length) const finalObject = { ...firstObject, ...(conditionState ? secondObject : {}), ...(conditionState ? secondObject : {}), ...(!conditionState ? secondObject : {}) };
Using Object.assign
const firstObject = { a: 'a', b: 'b', c: 'c', d: 'd', e: 'e', f: 'f', g: 'g' } const secondObject = { 0: 0, 1: 1, 2: 2, 3: 3, 4: '4', 5: '5', 6: '6', 7: '7' } const conditionState = Boolean(Object.keys(secondObject).length) const finalObject = Object.assign(firstObject, conditionState && secondObject, conditionState && secondObject, !conditionState && secondObject);
Using mutation
const firstObject = { a: 'a', b: 'b', c: 'c', d: 'd', e: 'e', f: 'f', g: 'g' } const secondObject = { 0: 0, 1: 1, 2: 2, 3: 3, 4: '4', 5: '5', 6: '6', 7: '7' } const conditionState = Boolean(Object.keys(secondObject).length) const finalObject = { a: firstObject.a, b: firstObject.b, c: firstObject.c, d: firstObject.d, e: firstObject.e, f: firstObject.f, g: firstObject.g } if (conditionState) { finalObject[0] = secondObject[0] finalObject[1] = secondObject[1] finalObject[2] = secondObject[2] finalObject[3] = secondObject[3] finalObject[4] = secondObject[4] finalObject[5] = secondObject[5] finalObject[6] = secondObject[6] finalObject[7] = secondObject[7] } if (conditionState) { finalObject[0] = secondObject[0] finalObject[1] = secondObject[1] finalObject[2] = secondObject[2] finalObject[3] = secondObject[3] finalObject[4] = secondObject[4] finalObject[5] = secondObject[5] finalObject[6] = secondObject[6] finalObject[7] = secondObject[7] } if (!conditionState) { finalObject[0] = secondObject[0] finalObject[1] = secondObject[1] finalObject[2] = secondObject[2] finalObject[3] = secondObject[3] finalObject[4] = secondObject[4] finalObject[5] = secondObject[5] finalObject[6] = secondObject[6] finalObject[7] = secondObject[7] }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using Object.assign
Using mutation

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 13; Pixel 6a) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 108 on Android

View result in a separate tab

Test name	Executions per second
Using the spread operator	159508.6 Ops/sec
Using Object.assign	154491.9 Ops/sec
Using mutation	756927.8 Ops/sec

JavaScript spread operator vs Object.assign vs mutation performance with condition #7 (version: 0)

Comparing performance of: Using the spread operator vs Using Object.assign vs Using mutation

Created: one year ago by: Guest

Jump to the latest result

Using the spread operator

Using Object.assign

Using mutation

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A