What does number mean in js

The Number data type in JavaScript is used to represent numeric values ​​and can be created through literals, Number() function or parseInt(). The following properties and methods are available: .valueOf(), .toFixed(n), .toPrecision(n), .toLocaleString(), .isNaN(), and .isFinite(). The Number type supports addition, subtraction, multiplication, division, and modulo operations. NaN represents a non-numeric value, while Infinity represents infinity.

Number in JavaScript

Number data type

Number Data types are used to represent numeric values. It is a built-in data type used to handle integers and decimals.

Create Number

You can create a Number object in the following ways:

• Direct literal: const num = 123;
• Use Number() function: const num = Number("123");
• Use parseInt() or parseFloat() function: const int = parseInt("123"); // Returns the integer 123

Number Properties and Methods

Number object has the following useful properties and Method:

• .valueOf(): Returns the original numeric value.
• .toFixed(n): Convert the number to a string and round it according to the specified number of digits.
• .toPrecision(n): Convert a number to a string, preserving the specified valid digits.
• .toLocaleString(): Convert a number to a string and use local formatting.
• .isNaN(): Checks whether the value is NaN (not a number).
• .isFinite(): Checks whether the value is a finite number (not NaN, positive infinity, or negative infinity).

Number operations

Number type supports the following operations:

• Addition ( )
• Subtraction (- )
• Multiplication (*)
• Division (/)
• Modular operation (%)

NaN and Infinity

NaN (not a number) represents a value that is not a valid number. Infinity means infinity. These values ​​can be generated by arithmetic operations, for example:

• ##NaN 1 // NaN
• 1 / 0 // Infinity

These values ​​are useful special values ​​in JavaScript to indicate errors or infinity.

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