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Run results for:
Array initialization: preallocate vs push (Objects)
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Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36
Browser:
Chrome 109
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Preallocate
22.2 Ops/sec
Push
12.0 Ops/sec
Tests:
Preallocate
var N = 1000000; var result = new Array(N); for (var i = 0; i < N; i++) { result[i] = { value: N }; }
Push
var N = 1000000; var result = []; for (var i = 0; i < N; i++) { result.push({ value: N }); }