Run results for: empty an array in JavaScript - splice vs setting length faster

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 15_8_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.7 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.8.4

Device Platform: Tablet

Date tested: one year ago

Set length to zero

14.4M/s

Splice

4.1M/s

View exact numbers

Test name	Executions per second
✓ Set length to zero	14,405,053 Ops/sec
Splice	4,131,588 Ops/sec

Script Preparation code:

var size = 10000;
var arr = [];
for (var i = 0; i < size; i++){
  arr.push(i);
}

Tests: