Run results for: Does presetting the size of an array make a difference?

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Dynamic	1156.6 Ops/sec
Preset	1205.1 Ops/sec

Script Preparation code:

var size = 10000;

Tests:

Dynamic
const arr = []; for (let i = 0; i < size; i++) { arr[i] = i; }
Preset
const arr = new Array(size); for (let i = 0; i < size; i++) { arr[i] = i; }