isNumber javascript Code Snippet in 2025
typemathbeginner
Last Updated: 14 May 2025
Checks if the given argument is a number.
- Use
typeofto check if a value is classified as a number primitive. - To safeguard against
NaN, check ifval === val(asNaNhas atypeofequal tonumberand is the only value not equal to itself).
const isNumber = val => typeof val === 'number' && val === val;
isNumber(1); // true
isNumber('1'); // false
isNumber(NaN); // falsejavascript snippet similar to isNumber For You in May 2025
Subscribe to our Newsletter
Subscribe to get resources directly to your inbox. You won't receive any spam! ✌️