Number Data Types in JavaScript

Numbers are a primitive data type in JavaScript. They are used to represent numeric values. JavaScript uses the Number object to represent both integer and floating-point numbers.

What is a Number in JavaScript?

In JavaScript, numbers are used to represent numeric values. JavaScript uses the Number object to represent both integer and floating-point numbers.

How to Create a Number in JavaScript?

You can create a number in JavaScript using the following syntax:

Creating a Number in JavaScript

let count = 100; // Integer
let price = 99.99; // Floating-point number

In the above example, count is an integer, and price is a floating-point number.

Integer

An integer is a whole number, positive or negative, without decimals, of unlimited length. For example:

Integer

let count = 100;
let temperature = -10;

Floating-Point Number

A floating-point number is a number with a decimal point or an exponent. For example:

Floating-Point Number

let price = 99.99;
let pi = 3.14;

NaN (Not a Number)

NaN is a special value that represents "Not-a-Number". It indicates that a value is not a legal number. For example:

NaN

let result = 100 / "Apple";
console.log(result); // Output: NaN

Infinity

Infinity is a special value that represents positive infinity. It is displayed when a number exceeds the upper limit of the floating-point numbers. For example:

Infinity

let max = Number.MAX_VALUE;
let infinity = max * 2;
console.log(infinity); // Output: Infinity

BigInt

The bigint data type is used to represent whole numbers larger than 2^53 - 1. It is a new feature in JavaScript and is not supported in all browsers. For example:

BigInt

let value = 9007199254740991n;

📝 Note

• The n at the end of the number indicates that it is a bigint. You can also create a bigint using the BigInt() function. For example: let value = BigInt(9007199254740991);.
• n is not a part of the number, it is a part of the syntax to create a bigint.
• You cannot perform arithmetic operations between bigint and other number types. You need to convert the other number types to bigint before performing arithmetic operations.
• infinity is used to represent positive infinity, and -Infinity is used to represent negative infinity.
• NaN is used to represent "Not-a-Number". It indicates that a value is not a legal number.
• Number.MAX_VALUE is the largest positive finite value representable in JavaScript.
• Number.MIN_VALUE is the smallest positive value representable in JavaScript.
• Number.EPSILON is the smallest interval between two representable numbers.
• Number.POSITIVE_INFINITY is the positive infinity value.

tipes and tricks

1. Integers:
   • An integer is a whole number, positive or negative, without decimals, of unlimited length.
   • For example: let count = 100;, let temperature = -10;
   • Output: 100, -10
2. Floating-Point Numbers:
   • A floating-point number is a number with a decimal point or an exponent.
   • For example: let price = 99.99;, let pi = 3.14;
   • Output: 99.99, 3.14
3. NaN (Not a Number):
   • NaN is a special value that represents "Not-a-Number".
   • It indicates that a value is not a legal number.
   • For example: let result = 100 / "Apple";
   • Output: NaN
4. Infinity:
   • Infinity is a special value that represents positive infinity.
   • It is displayed when a number exceeds the upper limit of the floating-point numbers.
   • For example: let max = Number.MAX_VALUE;, let infinity = max * 2;
   • Output: Infinity
5. BigInt:
   • The bigint data type is used to represent whole numbers larger than 2^53 - 1.
   • It is a new feature in JavaScript and is not supported in all browsers.
   • For example: let value = 9007199254740991n;
   • Output: 9007199254740991n

Conclusion

In this article, you learned about the number data type in JavaScript and how to use it. You also learned about integers, floating-point numbers, NaN, Infinity, and BigInt. You can use these data types to represent numeric values in JavaScript.