function functionName(parameters) {
  // Function body
  return result;
}

function greet(name) {
  return `Hello, ${name}!`;
}

console.log(greet('World'));

const functionName = function(parameters) {
  // Function body
  return result;
};

const greet = function(name) {
  return `Hello, ${name}!`;
};

console.log(greet('World'));

const functionName = (parameters) => {
  // Function body
  return result;
};

const greet = (name) => `Hello, ${name}!`;

console.log(greet('World'));

(function() {
  // Function body
})();

(function() {
  console.log('IIFE executed');
})();

function addNumbers(a, b) {
  return a + b;
}

console.log(addNumbers(5, 10)); // Output: 15