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Run results for:
Object spread vs Object.assign vs simple assignement
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=622214" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Browser:
Chrome 143
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
8 months ago
manually assigning
93.1M/s
Object.assign
64.9M/s
spread
40.8M/s
View exact numbers
Test name
Executions per second
✓
manually assigning
93,082,616 Ops/sec
Object.assign
64,914,292 Ops/sec
spread
40,781,156 Ops/sec
HTML Preparation code:
<!--your preparation HTML code goes here-->
Script Preparation code:
const firstObject = {} firstObject.key1 = 'Hello world'; firstObject.key2 = 'foo bar'; firstObject.key3 = '42'; firstObject.key4 = 'Hitch Hikers Guide to the Galaxy'; const secondObject = {} firstObject.key3 = 'Hello world'; firstObject.key4 = 'foo bar'; firstObject.key5 = '42'; firstObject.key6 = 'Hitch Hikers Guide to the Galaxy';
Tests:
spread
const firstObject = {} firstObject.key1 = 'Hello world'; firstObject.key2 = 'foo bar'; firstObject.key3 = '42'; firstObject.key4 = 'Hitch Hikers Guide to the Galaxy'; const secondObject = {} firstObject.key3 = 'Hello world'; firstObject.key4 = 'foo bar'; firstObject.key5 = '42'; firstObject.key6 = 'Hitch Hikers Guide to the Galaxy'; const output = { ...firstObject, ...secondObject }
Object.assign
const firstObject = {} firstObject.key1 = 'Hello world'; firstObject.key2 = 'foo bar'; firstObject.key3 = '42'; firstObject.key4 = 'Hitch Hikers Guide to the Galaxy'; const secondObject = {} firstObject.key3 = 'Hello world'; firstObject.key4 = 'foo bar'; firstObject.key5 = '42'; firstObject.key6 = 'Hitch Hikers Guide to the Galaxy'; // Note this does modify and return the first object, doesn't create a new one const output = Object.assign(firstObject, secondObject);
manually assigning
const firstObject = {} firstObject.key1 = 'Hello world'; firstObject.key2 = 'foo bar'; firstObject.key3 = '42'; firstObject.key4 = 'Hitch Hikers Guide to the Galaxy'; const secondObject = {} firstObject.key3 = 'Hello world'; firstObject.key4 = 'foo bar'; firstObject.key5 = '42'; firstObject.key6 = 'Hitch Hikers Guide to the Galaxy'; // Note this does modify and return the first object, doesn't create a new one for (const key in secondObject) { firstObject[key] = secondObject[key] } const output = firstObject;