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Run results for:
Direct Array Access vs. New Local Constant Variable in A Loop
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<iframe src="https://measurethat.net/Embed?id=494331" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0
Browser:
Firefox 121
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Direct Array Access
311247.3 Ops/sec
Local Variable Access
294887.1 Ops/sec
Script Preparation code:
var arr = [ { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, ] var newarr1 = [] var newarr2 = []
Tests:
Direct Array Access
for (var i = 0; i < arr.length; i++) { newarr1.push(arr[i]) }
Local Variable Access
for (var i = 0; i < arr.length; i++) { const el = arr[i] newarr2.push(el) }