// Traditional function function add(a, b) { return a + b; } // Arrow function (same as above) const addArrow = (a, b) => a + b; // Single parameter (no parentheses needed) const double = num => num * 2; // No parameters (parentheses needed) const sayHello = () => 'Hello!'; // Using with array methods const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); console.log(doubled);