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

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 6 months ago

Set length to zero

31.4M/s

Splice

21.2M/s

View exact numbers

Test name	Executions per second
✓ Set length to zero	31,387,354 Ops/sec
Splice	21,210,000 Ops/sec

Script Preparation code:

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

Tests: