JavaScript - Numbers

JavaScript - Numbers

Introduction

In JavaScript, numbers are a fundamental data type used for representing numerical values. They can be used for performing mathematical calculations and storing numeric information. This documentation provides an overview of working with numbers in JavaScript, including their syntax, operations, and common use cases.

Number Syntax

In JavaScript, numbers can be written using numeric literals or as the result of mathematical expressions. Numeric literals can be written as integers or floating-point numbers. Here are a few examples:

javascript
let integerNumber = 42;
let floatingPointNumber = 3.14;

Number Operations

JavaScript provides a wide range of mathematical operations that can be performed on numbers. Some of the commonly used operations include:

Addition

The addition operator (+) is used to add two or more numbers together. Here's an example:

javascript
let sum = 2 + 3; // Result: 5

Subtraction

The subtraction operator (-) is used to subtract one number from another. Here's an example:

javascript
let difference = 5 - 2; // Result: 3

Multiplication

The multiplication operator (*) is used to multiply two or more numbers. Here's an example:

javascript
let product = 2 * 3; // Result: 6

Division

The division operator (/) is used to divide one number by another. Here's an example:

javascript
let quotient = 6 / 2; // Result: 3

Modulo

The modulo operator (%) returns the remainder after division. Here's an example:

javascript
let remainder = 7 % 3; // Result: 1

Exponentiation

The exponentiation operator (**) raises the left operand to the power of the right operand. Here's an example:

javascript
let result = 2 ** 3; // Result: 8

Number Methods

JavaScript provides several built-in methods for performing operations on numbers. Some of the commonly used methods include:

parseInt()

The parseInt() function parses a string and returns an integer. Here's an example:

javascript
let numberString = "42";
let parsedNumber = parseInt(numberString); // Result: 42

parseFloat()

The parseFloat() function parses a string and returns a floating-point number. Here's an example:

javascript
let floatString = "3.14";
let parsedFloat = parseFloat(floatString); // Result: 3.14

toFixed()

The toFixed() method formats a number with a fixed number of decimal places. Here's an example:

javascript
let pi = 3.14159;
let formattedPi = pi.toFixed(2); // Result: "3.14"

Conclusion

Numbers are an essential data type in JavaScript for performing mathematical operations and storing numeric information. This documentation covered the syntax of numbers, various mathematical operations, and commonly used number methods in JavaScript. Understanding these concepts will help you work effectively with numbers in your JavaScript programs.