Benchmark: Array initialization: preallocate_add_end vs push

Script Preparation code:

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

Tests:

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

Rendered benchmark preparation results:

Previous results

Test case name	Result
Preallocate
Push

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36 Edg/111.0.1661.41

Browser/OS: Chrome 111 on Windows

Test name	Executions per second
Preallocate	21555.0 Ops/sec
Push	16016.2 Ops/sec

Array initialization: preallocate_add_end vs push (version: 0)