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Run results for:
Array initialization: preallocate vs push vs preallocate & fill
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<iframe src="https://measurethat.net/Embed?id=604315" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.4.1
Device Platform:
Mobile
Date tested:
one year ago
Test name
Executions per second
Preallocate
144561.1 Ops/sec
Preallocate & fill
100774.9 Ops/sec
Push
38137.8 Ops/sec
Index
53843.1 Ops/sec
Tests:
Preallocate
var N = 10000; var result = new Array(N); for (var i = 0; i < N; i++) { result[i] = i * 2; }
Preallocate & fill
var N = 10000; var result = new Array(N).fill(0); for (var i = 0; i < N; i++) { result[i] = i * 2; }
Push
var N = 10000; var result = []; for (var i = 0; i < N; i++) { result.push(i * 2); }
Index
var N = 10000; var result = []; for (var i = 0; i < N; i++) { result[i] = i * 2; }