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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Set length to zero

31.3M/s

Splice

12.6M/s

View exact numbers

Test name	Executions per second
✓ Set length to zero	31,317,630 Ops/sec
Splice	12,568,153 Ops/sec

Script Preparation code:

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

Tests: