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Run results for:
For let vs var vs const
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=573573" 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/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
for in with var
109K/s
for in with let
108K/s
for in with const
108K/s
View exact numbers
Test name
Executions per second
✓
for in with var
108,981 Ops/sec
for in with let
108,083 Ops/sec
for in with const
107,597 Ops/sec
Script Preparation code:
let array = new Array(100).fill(1); let total = 0;
Tests:
for in with let
for (let i in array) { total += array[i]; }
for in with var
for (var i in array) { total += array[i]; }
for in with const
for (const i in array) { total += array[i]; }