JavaScript is a versatile and widely-used programming language primarily known for its role in web development. It enables interactive features on web pages and can be used on both the client and server sides.
Variables and Data Types
Variables are containers for storing data values. JavaScript has several data types, including:
Number: Represents numeric values.
String: Represents text.
Boolean: Represents true or false.
Object: Represents a collection of properties.
Array: Represents a list-like collection of values.
Undefined: Represents a variable that has been declared but not assigned a value.
Null: Represents a deliberate non-value.
Declaring Variables
1. Variables and Data Types
JavaScript has three ways to declare variables: var, let, and const. It supports different data types such as numbers, strings, booleans, arrays, objects, etc.
Functions
Functions are blocks of code designed to perform a particular task. They can be declared in different ways:Function Declaration: Defines a function with a name.Function Expression: Defines a function and assigns it to a variable.Arrow Function: A concise way to write functions.