Copyright 2025

The Valley of Code

A Flavio Copes project

The Number isFinite() method
Find out all about the JavaScript isFinite() method of the Number object

Returns true if the passed value is a finite number. Anything else, booleans, strings, objects, arrays, returns false:

Number.isFinite(1) //true
Number.isFinite(-237) //true
Number.isFinite(0) //true
Number.isFinite(0.2) //true

Number.isFinite('Flavio') //false
Number.isFinite(true) //false
Number.isFinite({}) //false
Number.isFinite([1, 2, 3]) //false

Want to master TypeScript? Check out my TypeScript Masterclass

Join my AI Workshop !

The Web Development BOOTCAMP cohort starts in February 2026