P3.1: JavaScript Basics & Variables

JavaScript is the programming language of the web. It controls the interactive behavior of websites.

1. Declaring Variables

Modern JavaScript uses let and const to store variables:

• const (Constant): Sourced for variables that should never change.
• let: Sourced for variables that will be reassigned.
• Never use var: It has outdated scoping behaviors.

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2. Core Data Types

• String: "Hello"
• Number: 42, 3.14
• Boolean: true / false
• Null: Represents an intentional empty value.
• Undefined: Variable declared but not assigned.