Run results for: Array initialization: preallocate vs push

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Preallocate

15K/s

Push

10K/s

View exact numbers

Test name	Executions per second
✓ Preallocate	14,544 Ops/sec
Push	10,499 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); }