Run results for: Array initialization: preallocate vs push

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Push

137K/s

Preallocate

88K/s

View exact numbers

Test name	Executions per second
✓ Push	137,196 Ops/sec
Preallocate	87,682 Ops/sec

Tests:

Preallocate
var N = 10000; var result = new Array(N); for (var i = 0; i < N; i++) { result[i] = N; }
Push
var N = 10000; var result = []; for (var i = 0; i < N; i++) { result.push(N); }