JavaScript Program to Check if a Number is Float or Integer

JavaScript Program to Check if a Number is Float or Integer

Last Updated : 04 Oct, 2023

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.

Using the Number.isInteger() Method

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

Using the Modulus Operator (%)

The Modulus Operator calculates the remainder when the number is divided by 1. If the remainder is 0, the number is an integer; otherwise, it's a float.

Syntax

(number % 1 === 0);

Example: This example uses the Modulus Operator (%) to check the Number.

JavaScript

const inputNumber = 3.14;
const isInteger = inputNumber % 1 === 0;
console.log(
    `Is ${inputNumber} a integer? ${isInteger}`
);

Output

Is 3.14 a integer? false

Using Regular Expressions

This approach involves converting the number to a string and using a Regular Expression to check if it contains a decimal point. If it does, it's a float; otherwise, it's an integer.

Syntax

/\d+\.\d+/.test(numberString);

JavaScript

const inputNumber = 123.456;
const numberString = inputNumber.toString();
const isFloat = /\d+\.\d+/.test(
    numberString
);
console.log(
    `Is ${inputNumber} a float? ${isFloat}`
);

Output

Is 123.456 a float? true

JavaScript Program to Check if a Number is Float or Integer

A

anjugaeu01

Improve

Article Tags :

Similar Reads

How to Check if a Value is a Number in JavaScript ?

To check if a value is a number in JavaScript, use the typeof operator to ensure the value's type is 'number'. Additionally, functions like Number.isFinite() and !isNaN() can verify if a value is a valid, finite number.Methods to Check if a Value is a NumberThere are various ways to check if a value

How to compare isNaN() and isInteger() Methods in JavaScript ?

JavaScript provides various in-built functions that developers can use to check the type of values of variables. Two such functions are isNaN() and isInteger(). In this article, we will discuss the difference between these two functions and when to use them. isNaN() Method: The JavaScript isNaN() me

JavaScript Number Programming Examples

Javascript Numbers are primitive data types. Unlike other programming languages, Both integers and floating-point values are represented by JavaScript's number type. The IEEE-754 format is the one that is technically used by the JavaScript number type. Here, you donâ€™t need int, float, etc, to declar

How to convert string into float in JavaScript?

In this article, we will convert a string into a float in Javascript. We can convert a string into a float in JavaScript by using some methods which are described below: Methods to Concert String into Float:Table of Content Method 1: By using Type Conversion of JavaScriptMethod 2: By using parseFloa

Shell Script To Check For a Valid Floating-Point Value

User Input can be hectic to manage especially if it's about numbers. Let's say you wanted to perform mathematical calculations in your app or script. It's not hard to say that it will have to deal with floating-point numbers. It's easy in many statically typed programming languages but if it has to

Check If Value Is Int or Float in Python

In Python, you might want to see if a number is a whole number (integer) or a decimal (float). Python has built-in functions to make this easy. There are simple ones like type() and more advanced ones like isinstance(). In this article, we'll explore different ways to check if a value is an integer

Check If String is Integer in Python

In this article, we will explore different possible ways through which we can check if a string is an integer or not. We will explore different methods and see how each method works with a clear understanding.Example:Input2 : "geeksforgeeks"Output2 : geeksforgeeks is not an IntigerExplanation : "gee

How to Check if a Variable Is a Number in Bash

A number contains a combination of digits from 0-9. All the variables in Bash are treated as character strings but the arithmetic operations and comparisons are allowed even when it is stored in the string format. But before performing any arithmetic operations, we need to check if the stored value

JavaScript Number isInteger() Method

The Number.isInteger() method in JavaScript is useful for checking whether a number is a whole number or not. Syntax:Number.isInteger(value);Parameters:value: The value to be checked.Return Value:It returns a boolean value,i.e. either true or false. It will return true if the passed value is of the

Number Validation in JavaScript

Here are the various methods to validate numbers in JavaScript1. Check if a Value is a NumberUse typeof and isNaN() to determine if a value is a valid number.JavaScriptconst isNum = n => typeof n === 'number' && !isNaN(n); console.log(isNum(42)); console.log(isNum('42')); console.log(isNu