How to use the Number.isInteger() Method In Javascript

Using the Modulus Operator (%)

The Number.isInteger() Method checks if the given number is an integer or not. It returns true if the number is an integer, and false if it’s a float or not a number at all.

Syntax

Number.isInteger(number);

Example: This example uses the Number.isInteger() Method to check the Number.

Javascript

const inputNumber = 42;
const isInteger =
    Number.isInteger(inputNumber);
console.log(
    `Is ${inputNumber} an integer? ${isInteger}`
);

Output

Is 42 an integer? true

JavaScript Program to Check if a Number is Float or Integer

In this article, we will see how to check whether a number is a float or an integer in JavaScript. A float is a number with a decimal point, while an integer is a whole number or a natural number without having a decimal point.

Table of Content

Using the Number.isInteger() Method
Using the Modulus Operator (%)
Using Regular Expressions

We will explore every approach to Check if a Number is a Float or Integer, along with understanding their basic implementations.

Tags:

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