JavaScript

# Is There or Isn’t There an Integer Type in JavaScript?

JavaScript is a dynamic/interactive programming language that uses dynamic types. Variables are not explicitly linked to any certain value type in JavaScript. There are seven fundamental data types in JavaScript, such as “String”, “Boolean”, “Number”, “Undefined”, “Null”, “Symbol”, and “Object”. More specifically, any number, including integers and decimal numbers, is considered in the “Number” data type.

This post will describe whether or not JavaScript has an integer data type.

## Is There or Isn’t There an Integer Type in JavaScript?

In JavaScript, there is no specific integer data type. It uses the “Number” data type to represent all numeric values, including integers. Using Number in JavaScript, you may determine whether a given number is an integer utilizing the “isInteger()” method.

### Example

Create a variable that stores the number “111”:

var num = 111;

Check the type of the variable utilizing the “typeof” attribute:

console.log(typeof num);

Now, call the “isInteger()” method to verify whether the specified number is an integer or not:

Number.isInteger(num);

The given output indicates that the number “111” belongs to the “Number” data type, and “true” indicates that it is an integer type: Let’s check a decimal number:

var num = 111.599;

It can be seen that the output displays “number” and “false” indicates that the given number belongs to “Number” data type, but it is not an integer: The data type “Number” in JavaScript is a floating-point representation, which means it can store both integers and fractional values. However, JavaScript gives some predefined methods that can be used to round off numbers to the nearest integer, including the “Math.floor()” method and “Math.ceil()” method:

console.log(Math.floor(num));

Output Call the Math.ceil() method to convert the decimal number into an integer:

console.log(Math.ceil(num));

It can be observed that the decimal number has been successfully converted into an integer: For taking input as a string, there is a “parseInt()” method that can be used to convert a string to an integer. To do so, store number “1511” as a string in a variable “numberAsString”:

var numberAsString = "1511";

Check the variable type utilizing the “typeof” operator:

console.log(numberAsString + " is " + typeof numberAsString);

Call the “parseInt()” method for converting the string into an integer:

var number = parseInt(numberAsString);

Verify the type of the converted number:

console.log(number + " is " + typeof number);

It can be seen that the string is successfully converted into number type: That was all about checking the type of a number in JavaScript.

## Conclusion

In JavaScript, there is no specific integer data type. It uses the “Number” data type to represent all numeric values, such as fractional values and integers. To determine/check whether or not a given number is an integer, use the “isInteger()” method. This post described whether or not JavaScript has an integer data type. 