JavaScript-Learning-Repository/lessons.html at main · sharada-marasinghe/JavaScript-Learning-Repository · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JavaScript Lessons - Interactive Learning Hub</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script>
        tailwind.config = {
            theme: {
                extend: {
                    colors: {
                        'edu-blue': '#3B82F6',
                        'edu-green': '#10B981',
                        'edu-purple': '#8B5CF6',
                        'edu-yellow': '#F59E0B',
                        'edu-bg': '#F9FAFB',
                        'edu-text': '#374151'
                    }
                }
            }
        }
    </script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css">
    <link rel="stylesheet" href="css/educational-theme.css">
    <style>
        .lesson-modal {
            display: none;
        }

        .lesson-modal.active {
            display: flex;
        }

        .code-editor {
            background: #1F2937;
            border: 1px solid #374151;
            border-radius: 8px;
            padding: 1rem;
            font-family: 'JetBrains Mono', 'Fira Code', monospace;
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            width: 100%;
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        .output-panel {
            background: #111827;
            border: 1px solid #374151;
            border-radius: 8px;
            padding: 1rem;
            font-family: 'JetBrains Mono', 'Fira Code', monospace;
            color: #10B981;
            min-height: 100px;
            overflow-y: auto;
        }
    </style>
</head>

<body class="bg-edu-bg text-edu-text">
    <!-- Navigation -->
    <nav class="bg-white shadow-lg fixed w-full z-50">
        <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
            <div class="flex justify-between h-16">
                <div class="flex items-center">
                    <div class="flex-shrink-0 flex items-center">
                        <a href="index.html" class="flex items-center">
                            <span class="text-2xl font-bold text-edu-blue">JS</span>
                            <span class="text-2xl font-bold text-edu-purple ml-1">Learning Hub</span>
                        </a>
                    </div>
                </div>
                <div class="hidden md:flex items-center space-x-8">
                    <a href="index.html" class="text-gray-700 hover:text-edu-blue transition-colors">Home</a>
                    <a href="lessons.html" class="text-edu-blue font-semibold">Lessons</a>
                    <a href="playground.html" class="text-gray-700 hover:text-edu-blue transition-colors">Playground</a>
                    <a href="#exercises" class="text-gray-700 hover:text-edu-blue transition-colors">Exercises</a>
                </div>
            </div>
        </div>
    </nav>

    <!-- Header -->
    <section class="pt-20 pb-12 bg-gradient-to-r from-edu-blue to-edu-purple">
        <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 text-center text-white">
            <h1 class="text-4xl md:text-5xl font-bold mb-4">JavaScript Learning Modules</h1>
            <p class="text-xl opacity-90 max-w-3xl mx-auto">
                Complete your JavaScript journey with our comprehensive, interactive lessons designed for all skill
                levels.
            </p>
        </div>
    </section>

    <!-- Lessons Grid -->
    <section class="py-16">
        <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
            <div class="grid md:grid-cols-2 lg:grid-cols-3 gap-8" id="lessons-grid">
                <!-- Lessons will be populated by JavaScript -->
            </div>
        </div>
    </section>

    <!-- Lesson Modal -->
    <div id="lesson-modal" class="lesson-modal fixed inset-0 bg-black bg-opacity-50 items-center justify-center z-50">
        <div class="bg-white rounded-lg max-w-6xl w-full mx-4 max-h-screen overflow-y-auto">
            <div class="p-6 border-b border-gray-200 flex justify-between items-center">
                <h2 id="modal-title" class="text-2xl font-bold text-gray-900"></h2>
                <button id="close-modal" class="text-gray-500 hover:text-gray-700">
                    <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12">
                        </path>
                    </svg>
                </button>
            </div>
            <div class="p-6">
                <div id="modal-content" class="space-y-6">
                    <!-- Content will be populated dynamically -->
                </div>
            </div>
        </div>
    </div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/prism.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/components/prism-javascript.min.js"></script>
    <script>
        // Lesson data
        const lessons = [
            {
                id: 'variables',
                title: '01. Variables & Data Types',
                description: 'Learn about variable declarations, data types, and scope in JavaScript.',
                difficulty: 'beginner',
                color: 'from-edu-blue to-blue-600',
                content: {
                    explanation: `Variables are containers for storing data values. In JavaScript, you can declare variables using let, const, or var keywords.`,
                    example: `// Variable declarations
let name = "John Doe";
let age = 25;
let isStudent = true;
let height = 5.8;

// Constants
const PI = 3.14159;
const COMPANY_NAME = "Tech Corp";

// Output variables
console.log("Name:", name);
console.log("Age:", age);
console.log("Is Student:", isStudent);
console.log("Height:", height);
console.log("PI:", PI);

// Check data types
console.log("Type of name:", typeof name);
console.log("Type of age:", typeof age);
console.log("Type of isStudent:", typeof isStudent);`,
                    exercise: `// Try this exercise:
// 1. Create a variable for your favorite movie
// 2. Create a variable for the year it was released
// 3. Create a boolean variable for whether you've watched it
// 4. Log all variables with descriptive messages

let favoriteMovie = ""; // Your code here
let releaseYear = 0; // Your code here
let hasWatched = false; // Your code here

console.log("My favorite movie is:", favoriteMovie);
console.log("It was released in:", releaseYear);
console.log("Have I watched it?", hasWatched);`
                }
            },
            {
                id: 'arithmetic',
                title: '02. Arithmetic Expressions',
                description: 'Master mathematical operations and calculations in JavaScript.',
                difficulty: 'beginner',
                color: 'from-edu-green to-green-600',
                content: {
                    explanation: `Arithmetic operators allow you to perform mathematical calculations. JavaScript supports all basic mathematical operations.`,
                    example: `// Basic arithmetic operations
let a = 10;
let b = 5;

console.log("Addition:", a + b);        // 15
console.log("Subtraction:", a - b);     // 5
console.log("Multiplication:", a * b);  // 50
console.log("Division:", a / b);        // 2
console.log("Modulus:", a % b);         // 0
console.log("Exponentiation:", a ** b); // 100000

// Order of operations (PEMDAS)
let result = 2 + 3 * 4;
console.log("2 + 3 * 4 =", result); // 14

let resultWithParens = (2 + 3) * 4;
console.log("(2 + 3) * 4 =", resultWithParens); // 20

// Increment and decrement
let counter = 0;
counter++; // Increment by 1
console.log("After increment:", counter); // 1

counter--; // Decrement by 1
console.log("After decrement:", counter); // 0`,
                    exercise: `// Calculate the area and circumference of a circle
const radius = 7;
const pi = 3.14159;

// Calculate area (π * r²)
let area = 0; // Your calculation here

// Calculate circumference (2 * π * r)
let circumference = 0; // Your calculation here

console.log("Radius:", radius);
console.log("Area:", area);
console.log("Circumference:", circumference);`
                }
            },
            {
                id: 'userinput',
                title: '03. User Input',
                description: 'Create interactive programs that respond to user input.',
                difficulty: 'beginner',
                color: 'from-edu-purple to-purple-600',
                content: {
                    explanation: `User input allows your programs to be interactive. In browsers, we can use prompt() for simple input, or HTML forms for more complex interactions.`,
                    example: `// Simple user input with prompt (browser only)
// Note: prompt() works in browsers, not in this console

// Simulating user input for demonstration
let userName = "Alice"; // Normally: prompt("What's your name?");
let userAge = "25"; // Normally: prompt("What's your age?");

// Convert string input to number
let age = parseInt(userAge);

console.log("Hello, " + userName + "!");
console.log("You are " + age + " years old.");

// Template literals (modern approach)
console.log(\`Hello, \${userName}! You are \${age} years old.\`);

// Age category logic
if (age < 18) {
    console.log("You are a minor.");
} else if (age < 65) {
    console.log("You are an adult.");
} else {
    console.log("You are a senior.");
}

// Working with HTML input (more common in web development)
// <input type="text" id="nameInput" placeholder="Enter your name">
// let inputValue = document.getElementById("nameInput").value;`,
                    exercise: `// Create a simple calculator
// Simulate getting two numbers from user
let num1 = "15"; // Normally from prompt() or input field
let num2 = "8";  // Normally from prompt() or input field

// Convert to numbers
let number1 = parseFloat(num1);
let number2 = parseFloat(num2);

// Perform calculations
let sum = 0;        // Your code here
let difference = 0; // Your code here
let product = 0;    // Your code here
let quotient = 0;   // Your code here

console.log(\`\${number1} + \${number2} = \${sum}\`);
console.log(\`\${number1} - \${number2} = \${difference}\`);
console.log(\`\${number1} * \${number2} = \${product}\`);
console.log(\`\${number1} / \${number2} = \${quotient}\`);`
                }
            },
            {
                id: 'typeconversion',
                title: '04. Type Conversion',
                description: 'Learn to convert between different data types effectively.',
                difficulty: 'beginner',
                color: 'from-edu-yellow to-yellow-600',
                content: {
                    explanation: `Type conversion (casting) is the process of converting one data type to another. JavaScript has both implicit (automatic) and explicit (manual) type conversion.`,
                    example: `// String to Number conversion
let strNumber = "123";
let num1 = Number(strNumber);
let num2 = parseInt(strNumber);
let num3 = parseFloat("123.45");

console.log("Original string:", strNumber, typeof strNumber);
console.log("Number():", num1, typeof num1);
console.log("parseInt():", num2, typeof num2);
console.log("parseFloat():", num3, typeof num3);

// Number to String conversion
let number = 456;
let str1 = String(number);
let str2 = number.toString();
let str3 = number + ""; // Implicit conversion

console.log("Original number:", number, typeof number);
console.log("String():", str1, typeof str1);
console.log("toString():", str2, typeof str2);
console.log("Implicit:", str3, typeof str3);

// Boolean conversion
let truthyValues = [1, "hello", [], {}];
let falsyValues = [0, "", null, undefined, false, NaN];

console.log("Truthy values:");
truthyValues.forEach(val => {
    console.log(val, "=>", Boolean(val));
});

console.log("Falsy values:");
falsyValues.forEach(val => {
    console.log(val, "=>", Boolean(val));
});`,
                    exercise: `// Type conversion practice
let userInput = "42.7";
let booleanString = "true";
let numberString = "100";

// Convert userInput to a number and round it
let roundedNumber = 0; // Your code here

// Convert booleanString to actual boolean
let actualBoolean = false; // Your code here (hint: compare with "true")

// Convert numberString to number and double it
let doubledNumber = 0; // Your code here

// Convert all results back to strings for display
let result1 = ""; // Your code here
let result2 = ""; // Your code here
let result3 = ""; // Your code here

console.log("Rounded number:", result1);
console.log("Boolean value:", result2);
console.log("Doubled number:", result3);`
                }
            },
            {
                id: 'constants',
                title: '05. Constants',
                description: 'Understand immutable variables and when to use const.',
                difficulty: 'beginner',
                color: 'from-red-500 to-red-600',
                content: {
                    explanation: `Constants are variables that cannot be reassigned after declaration. Use const for values that shouldn't change and for better code clarity.`,
                    example: `// Basic constants
const PI = 3.14159;
const COMPANY_NAME = "TechCorp";
const MAX_USERS = 1000;

console.log("PI:", PI);
console.log("Company:", COMPANY_NAME);
console.log("Max users:", MAX_USERS);

// Constants with objects (content can change, reference cannot)
const person = {
    name: "John",
    age: 30
};

// This works (modifying content)
person.age = 31;
person.city = "New York";
console.log("Modified person:", person);

// This would cause an error (reassigning reference)
// person = {}; // TypeError!

// Constants with arrays
const colors = ["red", "green", "blue"];
console.log("Original colors:", colors);

// This works (modifying content)
colors.push("yellow");
colors[0] = "crimson";
console.log("Modified colors:", colors);

// This would cause an error (reassigning reference)
// colors = []; // TypeError!

// Best practices
const CONFIG = {
    API_URL: "https://api.example.com",
    TIMEOUT: 5000,
    DEBUG_MODE: true
};

console.log("Configuration:", CONFIG);`,
                    exercise: `// Create a configuration object for a game
const GAME_CONFIG = {
    // Add your properties here
    PLAYER_LIVES: 0,    // Set to 3
    MAX_SCORE: 0,       // Set to 999999
    DIFFICULTY: "",     // Set to "medium"
    SOUND_ENABLED: false // Set to true
};

// Create an array of power-ups
const POWER_UPS = []; // Add: "speed", "shield", "double-score"

// Create constants for game boundaries
const MIN_X = 0; // Your value
const MAX_X = 0; // Set to 800
const MIN_Y = 0; // Your value
const MAX_Y = 0; // Set to 600

// Display all configuration
console.log("Game Config:", GAME_CONFIG);
console.log("Power-ups:", POWER_UPS);
console.log("Boundaries:", {MIN_X, MAX_X, MIN_Y, MAX_Y});

// Try modifying the arrays/objects (this should work)
POWER_UPS.push("extra-life");
GAME_CONFIG.PLAYER_LIVES = 5;

console.log("Modified config:", GAME_CONFIG);
console.log("Modified power-ups:", POWER_UPS);`
                }
            },
            {
                id: 'math',
                title: '06. Math Object',
                description: 'Explore the Math object for advanced mathematical operations.',
                difficulty: 'beginner',
                color: 'from-indigo-500 to-indigo-600',
                content: {
                    explanation: `The Math object provides mathematical constants and functions. It's a built-in object that has properties and methods for mathematical constants and functions.`,
                    example: `// Math constants
console.log("Math.PI:", Math.PI);
console.log("Math.E:", Math.E);

// Rounding methods
let num = 4.7;
console.log("Original:", num);
console.log("Math.round():", Math.round(num));  // 5
console.log("Math.floor():", Math.floor(num));  // 4
console.log("Math.ceil():", Math.ceil(num));    // 5

// Min and Max
let numbers = [5, 2, 8, 1, 9];
console.log("Numbers:", numbers);
console.log("Math.min():", Math.min(...numbers)); // 1
console.log("Math.max():", Math.max(...numbers)); // 9

// Power and square root
let base = 3;
let exponent = 4;
console.log(\`\${base}^\${exponent} =\`, Math.pow(base, exponent)); // 81
console.log("Square root of 16:", Math.sqrt(16)); // 4

// Random numbers
console.log("Random 0-1:", Math.random());
console.log("Random 1-10:", Math.floor(Math.random() * 10) + 1);
console.log("Random 1-100:", Math.floor(Math.random() * 100) + 1);

// Trigonometry (radians)
let degrees = 90;
let radians = degrees * (Math.PI / 180);
console.log("sin(90°):", Math.sin(radians)); // 1
console.log("cos(90°):", Math.cos(radians)); // ~0

// Absolute value
console.log("Math.abs(-5):", Math.abs(-5)); // 5`,
                    exercise: `// Create a dice rolling simulation
function rollDice(sides) {
    // Return random number between 1 and sides
    return 0; // Your code here using Math.random() and Math.floor()
}

function rollMultipleDice(numberOfDice, sides) {
    let results = [];
    // Roll multiple dice and store results
    // Your code here

    return results;
}

// Test your functions
let singleRoll = rollDice(6);
let multipleRolls = rollMultipleDice(3, 6);

console.log("Single dice roll (6-sided):", singleRoll);
console.log("Three dice rolls:", multipleRolls);
console.log("Sum of three dice:", multipleRolls.reduce((a, b) => a + b, 0));

// Calculate circle properties
let radius = 5;
let area = 0;          // π * r²
let circumference = 0; // 2 * π * r
let diameter = 0;      // 2 * r

console.log(\`Circle with radius \${radius}:\`);
console.log("Area:", area.toFixed(2));
console.log("Circumference:", circumference.toFixed(2));
console.log("Diameter:", diameter);`
                }
            }
        ];

        // Render lessons grid
        function renderLessons() {
            const grid = document.getElementById('lessons-grid');
            grid.innerHTML = lessons.map(lesson => `
                <div class="bg-white rounded-lg shadow-md overflow-hidden hover:shadow-lg transition-shadow cursor-pointer lesson-card"
                     onclick="openLesson('${lesson.id}')">
                    <div class="bg-gradient-to-r ${lesson.color} p-4">
                        <h3 class="text-white font-bold text-lg">${lesson.title}</h3>
                        <span class="inline-block mt-2 px-2 py-1 bg-white bg-opacity-20 rounded-full text-xs text-white">
                            ${lesson.difficulty}
                        </span>
                    </div>
                    <div class="p-6">
                        <p class="text-gray-600 mb-4">${lesson.description}</p>
                        <button class="text-edu-blue font-semibold hover:text-blue-600 transition-colors">
                            Start Lesson →
                        </button>
                    </div>
                </div>
            `).join('');
        }

        // Open lesson modal
        function openLesson(lessonId) {
            const lesson = lessons.find(l => l.id === lessonId);
            if (!lesson) return;

            document.getElementById('modal-title').textContent = lesson.title;
            document.getElementById('modal-content').innerHTML = `
                <div class="space-y-6">
                    <div>
                        <h3 class="text-lg font-semibold mb-3">📖 Explanation</h3>
                        <p class="text-gray-600 leading-relaxed">${lesson.content.explanation}</p>
                    </div>

                    <div>
                        <h3 class="text-lg font-semibold mb-3">💡 Example</h3>
                        <div class="bg-gray-900 rounded-lg p-4">
                            <div class="flex items-center justify-between mb-3">
                                <span class="text-gray-400 text-sm">JavaScript</span>
                                <button onclick="copyCode(this)" class="text-gray-400 hover:text-white text-sm">
                                    📋 Copy
                                </button>
                            </div>
                            <pre class="text-sm text-gray-100 overflow-x-auto"><code>${lesson.content.example}</code></pre>
                        </div>
                        <button onclick="runCode('${lessonId}', 'example')"
                                class="mt-3 bg-edu-green text-white px-4 py-2 rounded-lg hover:bg-green-600 transition-colors">
                            ▶ Run Example
                        </button>
                    </div>

                    <div>
                        <h3 class="text-lg font-semibold mb-3">🎯 Practice Exercise</h3>
                        <textarea id="exercise-${lessonId}" class="code-editor w-full" placeholder="Write your code here...">${lesson.content.exercise}</textarea>
                        <div class="mt-3 flex gap-3">
                            <button onclick="runCode('${lessonId}', 'exercise')"
                                    class="bg-edu-blue text-white px-4 py-2 rounded-lg hover:bg-blue-600 transition-colors">
                                ▶ Run Code
                            </button>
                            <button onclick="resetExercise('${lessonId}')"
                                    class="bg-gray-500 text-white px-4 py-2 rounded-lg hover:bg-gray-600 transition-colors">
                                🔄 Reset
                            </button>
                        </div>
                    </div>

                    <div>
                        <h3 class="text-lg font-semibold mb-3">📊 Output</h3>
                        <div id="output-${lessonId}" class="output-panel">
                            Click "Run Code" to see the output here...
                        </div>
                    </div>
                </div>
            `;

            document.getElementById('lesson-modal').classList.add('active');
        }

        // Close lesson modal
        function closeLesson() {
            document.getElementById('lesson-modal').classList.remove('active');
        }

        // Run code function
        function runCode(lessonId, type) {
            const lesson = lessons.find(l => l.id === lessonId);
            let code;

            if (type === 'example') {
                code = lesson.content.example;
            } else {
                code = document.getElementById(`exercise-${lessonId}`).value;
            }

            const outputDiv = document.getElementById(`output-${lessonId}`);
            outputDiv.innerHTML = '';

            // Capture console.log output
            const originalLog = console.log;
            const logs = [];

            console.log = (...args) => {
                logs.push(args.map(arg =>
                    typeof arg === 'object' ? JSON.stringify(arg, null, 2) : String(arg)
                ).join(' '));
            };

            try {
                // Execute the code
                eval(code);

                // Display output
                if (logs.length > 0) {
                    outputDiv.innerHTML = logs.map(log => `<div class="mb-1">${log}</div>`).join('');
                } else {
                    outputDiv.innerHTML = '<div class="text-gray-400">No output generated</div>';
                }
            } catch (error) {
                outputDiv.innerHTML = `<div class="text-red-400">Error: ${error.message}</div>`;
            } finally {
                // Restore original console.log
                console.log = originalLog;
            }
        }

        // Reset exercise
        function resetExercise(lessonId) {
            const lesson = lessons.find(l => l.id === lessonId);
            document.getElementById(`exercise-${lessonId}`).value = lesson.content.exercise;
            document.getElementById(`output-${lessonId}`).innerHTML = 'Click "Run Code" to see the output here...';
        }

        // Copy code function
        function copyCode(button) {
            const codeBlock = button.parentElement.nextElementSibling.textContent;
            navigator.clipboard.writeText(codeBlock).then(() => {
                button.textContent = '✅ Copied!';
                setTimeout(() => {
                    button.textContent = '📋 Copy';
                }, 2000);
            });
        }

        // Event listeners
        document.getElementById('close-modal').addEventListener('click', closeLesson);
        document.getElementById('lesson-modal').addEventListener('click', function (e) {
            if (e.target === this) {
                closeLesson();
            }
        });

        // Initialize
        renderLessons();
    </script>
</body>

</html>