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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=567039" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:132.0) Gecko/20100101 Firefox/132.0
Browser:
Firefox 132
Operating system:
Ubuntu
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Preallocate
61787.2 Ops/sec
Preallocate & fill
41346.7 Ops/sec
Push
51594.9 Ops/sec
Index
45438.2 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; }