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Run results for:
push array elements using spread vs iteration
Compare push using a spreaded array versus adding items one at a time.
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<iframe src="https://measurethat.net/Embed?id=488447" 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/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
spread
37480.6 Ops/sec
iteration using forEach
11087.8 Ops/sec
iteration using for
28283.6 Ops/sec
iteration using for...of
28338.2 Ops/sec
Script Preparation code:
var numSamples = 10000 var data = "TEST DATA" var makeArray = len=> Array(len).fill(data)
Tests:
spread
var a = [] var b = makeArray(numSamples) a.push(...b)
iteration using forEach
var a = [] var b = makeArray(numSamples) b.forEach(it => a.push(it))
iteration using for
var a = [] var b = makeArray(numSamples) for (var i=0; i<b.length; i++) { a.push(b[i]) }
iteration using for...of
var a = [] var b = makeArray(numSamples) for (var it of b) { a.push(it) }