JavaLearn/functions.html at master · jhavishesh7/JavaLearn · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Functions - JavaScript Mastery</title>
  <style>
    body { background: #121212; color: #fff; font-family: sans-serif; padding: 20px; }
    pre { background: #1e1e1e; padding: 10px; border-radius: 5px; margin-bottom: 20px; }
    .output { background: #222; color: #b9f6ca; padding: 12px; border-radius: 5px; min-height: 40px; margin-bottom: 20px; white-space: pre-line; }
    .btn { display: inline-block; background: #4caf50; color: white; font-size: 1.1em; padding: 10px 24px; border-radius: 6px; text-decoration: none; margin-top: 20px; }
    .btn:hover { background: #388e3c; }
    .explanation { background: #263238; color: #ffe082; border-radius: 6px; padding: 18px; margin-top: 30px; font-size: 1.08em; line-height: 1.7; }
    .explanation h2 { color: #ffd600; margin-top: 0; }
  </style>
</head>
<body>
  <h1>Functions</h1>
  <pre><code>function greet(name) {
    return `Hello, ${name}`;
}

const add = function(a, b) {
    return a + b;
};

const multiply = (a, b) => a * b;

function createUser(name, role = "user") {
    return `${name} is a ${role}`;
}

function sum(...numbers) {
    return numbers.reduce((total, num) => total + num, 0);
}

let output = `Greet: ${greet("Alice")}
Add: ${add(2, 3)}
Multiply: ${multiply(2, 3)}
Create User: ${createUser("Bob")}
Sum: ${sum(1, 2, 3, 4)}`;

document.getElementById('output').textContent = output;</code></pre>
  <div class="output" id="output"></div>
  <a href="index.html" class="btn">Back to Index</a>
  <div class="explanation">
    <h2>Explanation</h2>
    <ul>
      <li><b>greet(name)</b> — Returns a greeting for the given name.</li>
      <li><b>add(a, b)</b> — Returns the sum of <b>a</b> and <b>b</b>.</li>
      <li><b>multiply(a, b)</b> — Returns the product of <b>a</b> and <b>b</b>.</li>
      <li><b>createUser(name, role = "user")</b> — Returns a string describing the user and their role (default is "user").</li>
      <li><b>sum(...numbers)</b> — Returns the sum of any number of arguments using the rest parameter and <b>reduce</b>.</li>
      <li>The <b>output</b> variable uses template literals to show the results of calling these functions.</li>
      <li>The result is displayed in the green output box above.</li>
    </ul>
  </div>
  <script>
    function greet(name) {
      return `Hello, ${name}`;
    }
    const add = function(a, b) {
      return a + b;
    };
    const multiply = (a, b) => a * b;
    function createUser(name, role = "user") {
      return `${name} is a ${role}`;
    }
    function sum(...numbers) {
      return numbers.reduce((total, num) => total + num, 0);
    }
    let output = `Greet: ${greet("Alice")}
Add: ${add(2, 3)}
Multiply: ${multiply(2, 3)}
Create User: ${createUser("Bob")}
Sum: ${sum(1, 2, 3, 4)}`;
    document.getElementById('output').textContent = output;
  </script>
</body>
</html>