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Run results for:
slice vs subarray vs set - million elements
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=564427" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Browser:
Chrome 130
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
subarray direct
5463973.0 Ops/sec
slice direct
865.7 Ops/sec
subarray copy
699.4 Ops/sec
slice copy
446.1 Ops/sec
subarray set
974.6 Ops/sec
slice set
447.7 Ops/sec
Script Preparation code:
var data = new Array(1000000); for (var i = 0; i < data.length; i++) { data[i] = i % 2 === 0 ? i : i + 0.5; } var f32 = new Float32Array(data);
Tests:
subarray direct
var copy = f32.subarray(0, 500000);
slice direct
var copy = f32.slice(0, 500000);
subarray copy
var copy = new Float32Array(f32.subarray(0, 500000));
slice copy
var copy = new Float32Array(f32.slice(0, 500000));
subarray set
var copy = new Float32Array(1000000).set(f32.subarray(0, 500000));
slice set
var copy = new Float32Array(1000000).set(f32.slice(0, 500000));