Run results for: Best practice empty an array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Browser: Chrome 98

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Just instantiate new array	10518977.0 Ops/sec
Set length to zero	8504364.0 Ops/sec
Splice	5913087.5 Ops/sec
Pop all values	14575297.0 Ops/sec

Script Preparation code:

var size = 100000;

var arr1 = [];
var arr2 = [];
var arr3 = [];
var arr4 = [];

for (var i = 0; i < size; i++){
  arr1.push(i);
  arr2.push(i);
  arr3.push(i);
  arr4.push(i);
}

Tests:

Just instantiate new array
arr1 = [];
Set length to zero
arr2.length = 0;
Splice
arr3.splice(0, arr3.length);
Pop all values
while(arr4.length > 0){ arr4.pop(); }

Run results for: Best practice empty an array

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

Pop all values