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// Function to validate email address and return true/false
function validateEmail(email) {
  const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  return regex.test(email);
}

// Function to calculate age from birth date
function calculateAge(birthDate) {
  const today = new Date();
  const birth = new Date(birthDate);
  let age = today.getFullYear() - birth.getFullYear();
  const m = today.getMonth() - birth.getMonth();
  if (m < 0 || (m === 0 && today.getDate() < birth.getDate())) age--;
  return age;
}

// Cursor Ctrl+K prompt:
"Add input validation, handle edge cases, and add JSDoc comments"

// Before (tumhara code):
function divide(a, b) {
  return a / b;
}

// After (Cursor ne banaya — automatically!):
/**
 * Divides two numbers safely
 * @param {number} a - Dividend
 * @param {number} b - Divisor
 * @returns {number|null} Result or null if division by zero
 */
function divide(a, b) {
  if (typeof a !== 'number' || typeof b !== 'number') {
    throw new Error('Both arguments must be numbers');
  }
  if (b === 0) return null;
  return a / b;
}

// Prompt to Claude:
"This function has a bug. Find it, fix it, and explain why it was wrong:"

// Buggy code:
async function fetchUser(id) {
  const res = await fetch(`/api/users/${id}`);
  const data = res.json(); // BUG: missing await!
  return data.name;
}

// Claude's fix:
async function fetchUser(id) {
  const res  = await fetch(`/api/users/${id}`);
  const data = await res.json(); // Fixed: added await
  return data.name;
}
// Explanation: res.json() returns a Promise, not data directly.
// Without await, data was a Promise object, not the actual JSON.

// 1. Code samajhne ke liye:
"Explain this code line by line like I'm a beginner: [paste code]"

// 2. Algorithm banana:
"Write a binary search function in JavaScript with comments"

// 3. Code review:
"Review this code for bugs, performance issues, and best practices: [code]"

// 4. Convert language:
"Convert this Python code to JavaScript: [code]"

// 5. Test cases likhna:
"Write Jest unit tests for this function: [code]"

// Bad prompt (vague):
"Write a login function"

// Good prompt (specific + context):
"Write an async login function in JavaScript that:
- Takes email and password as parameters
- Validates email format
- Makes a POST request to /api/auth/login
- Returns user object on success
- Throws descriptive error messages on failure
- Uses try/catch for error handling"