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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=586652" 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/132.0.0.0 Safari/537.36
Browser:
Chrome 132
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Preallocate
104K/s
Preallocate & fill
65K/s
Push
46K/s
Index
43K/s
View exact numbers
Test name
Executions per second
✓
Preallocate
104,345 Ops/sec
Preallocate & fill
65,160 Ops/sec
Push
46,374 Ops/sec
Index
42,705 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; }