Run results for: empty an array in JavaScript?

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; Nexus 6P Build/OPM3.171019.013) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.123 Mobile Safari/537.36

Browser: Chrome Mobile 64

Operating system: Android 8.1.0

Device Platform: Nexus 6P

Date tested: 2025 years ago

Test name	Executions per second
Just instantiate new array	1806548.9 Ops/sec
Set length to zero	1152661.2 Ops/sec
Splice	756263.4 Ops/sec
Slice	938105.2 Ops/sec
splice 0	1084245.1 Ops/sec

Script Preparation code:

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

Tests:

Just instantiate new array
arr = [];
Set length to zero
arr.length = 0;
Splice
arr.splice(0, arr.length);
Slice
arr = arr.slice(10);
splice 0
arr.splice(0);

Run results for: empty an array in JavaScript?

Based on question on http://stackoverflow.com/questions/1232040/how-do-i-empty-an-array-in-javascript

Just instantiate new array

Set length to zero

Splice

Slice

splice 0