Run results for: array dynamic vs fixed length

Run details:

User agent: Mozilla/5.0 (Android 12; Mobile; rv:99.0) Gecko/99.0 Firefox/99.0

Browser: Firefox Mobile 99

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
dynamic	58.9 Ops/sec
fixed	8.8 Ops/sec

Script Preparation code:

var len = 100000;

Tests:

dynamic
var arr = []; for (var i = 0; i < len; i++) { arr.unshift(i); }
fixed
var arr = new Array(len); for (var i = 0; i < len; i++) { arr.unshift(i); }