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Run results for:
foreach vs spread operator 2
Compare the new ES6 spread operator with the traditional concat() method
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<iframe src="https://measurethat.net/Embed?id=542116" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36
Browser:
Chrome 128
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
forEach
45.5M/s
spread operator
24.5M/s
View exact numbers
Test name
Executions per second
✓
forEach
45,513,344 Ops/sec
spread operator
24,536,534 Ops/sec
Tests:
forEach
var a = {'1': 1, '2': 2, '3': 3, '4': 4} var b = [{id: 5}, {id: 6}, {id: 7}, {id: 8}] b.forEach(x => { a[x.id] = x })
spread operator
var a = {'1': 1, '2': 2, '3': 3, '4': 4} var b = [{id: 5}, {id: 6}, {id: 7}, {id: 8}] a = {...a, ...b.reduce((obj, item) => { obj[item.id]; return obj }, {})}