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Run results for:
Number.isInteger() vs typeof
Is it faster to detect if a variable is an integer or is it faster to use typeof to verify the type?
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<iframe src="https://measurethat.net/Embed?id=592569" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0
Browser:
Firefox 115
Operating system:
Windows 8.1
Device Platform:
Desktop
Date tested:
one year ago
typeof negative
96.4M/s
typeof positive
95.5M/s
Number.isInteger() negative
93.7M/s
Number.isInteger() positive
88.4M/s
View exact numbers
Test name
Executions per second
✓
typeof negative
96,421,976 Ops/sec
typeof positive
95,500,984 Ops/sec
Number.isInteger() negative
93,695,096 Ops/sec
Number.isInteger() positive
88,399,352 Ops/sec
Tests:
Number.isInteger() positive
Number.isInteger(3) === true
typeof positive
typeof 3 === "number";
Number.isInteger() negative
Number.isInteger("three") === false
typeof negative
typeof "three" === "number";