Introduction to JavaScript

Learning Objectives Define what JavaScript is and explain its role in making websites interactive. Declare and initialize variables using `let` and `const`. Identify and use basic data types: strings, numbers, and booleans. Write a simple JavaScript program that uses `console.log()` to display output in the browser's developer console. Perform basic arithmetic operations (+, -, *, /) on number variables. Get user input using the `prompt()` function and store it in a variable. Link an external JavaScript file to an HTML document using the `<script>` tag. Ever wonder how websites become interactive, with games, quizzes, and cool animations? 🤔 That's the magic of JavaScript! In this lesson, you'll learn the basics of JavaScript, the programming language...

TermDefinitionExample VariableA named container for storing data values. Think of it like a labeled box where you can put information that your program can use or change.`let playerScore = 100;` Here, `playerScore` is the variable, and it holds the number `100`. Data TypeThe type of data a variable can hold. The three basic types are strings (text), numbers, and booleans (true/false).`let name = "Ada";` (String), `let age = 14;` (Number), `let isStudent = true;` (Boolean). StringA sequence of characters, like text, enclosed in single ('') or double ("") quotes.`let greeting = "Hello, world!";` NumberA numerical value, including integers and decimals. Numbers are written without quotes.`let temperature = 21.5;` or `let itemsInCart = 3;` BooleanA data...

Variable Declaration `let variableName = value;` or `const constantName = value;` Use `let` for variables whose value might change later in the program. Use `const` for constants whose value will never change. Every complete statement should end with a semicolon `;`. Linking JavaScript to HTML <script src="script.js"></script> To make your JavaScript code run on a webpage, you must link the file. Place this tag inside your HTML file, usually right before the closing `</body>` tag, to ensure the HTML page loads first. Getting User Input let userInput = prompt("Your question for the user"); Use the `prompt()` function to display a dialog box that asks the user for input. The text the user types is always returned as a string and st...