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Run results for:
Empty an array in JavaScript
Given an array of 100,000 random numbers, is it faster to empty the array by instantiating a new array, setting its length to zero, splicing it at index zero, or popping all values?
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<iframe src="https://measurethat.net/Embed?id=596657" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser:
Chrome 134
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Set length to zero
102/s
Splice at index zero
101/s
Instantiate new array
101/s
Pop all values
100/s
View exact numbers
Test name
Executions per second
✓
Set length to zero
102 Ops/sec
Splice at index zero
101 Ops/sec
Instantiate new array
101 Ops/sec
Pop all values
100 Ops/sec
Script Preparation code:
var size = 100000; var a = []; for (var i = 0; i < size; i++){ a.push(Math.random()); }
Tests:
Instantiate new array
var a1 = JSON.parse(JSON.stringify(a)); a1 = [];
Set length to zero
var a2 = JSON.parse(JSON.stringify(a)); a2.length = 0;
Splice at index zero
var a3 = JSON.parse(JSON.stringify(a)); a3.splice(0, a3.length);
Pop all values
var a4 = JSON.parse(JSON.stringify(a)); while(a4.length > 0){ a4.pop(); }