node.js/JavaScript语法-向传递的参数添加额外参数

function greet(name = 'Guest') {
  console.log(`Hello, ${name}!`);
}

greet(); // Output: Hello, Guest!
greet('John'); // Output: Hello, John!

function sum(...numbers) {
  let total = 0;
  for (let number of numbers) {
    total += number;
  }
  return total;
}

console.log(sum(1, 2, 3)); // Output: 6
console.log(sum(1, 2, 3, 4, 5)); // Output: 15

function greet(options) {
  let name = options.name || 'Guest';
  let age = options.age || 18;
  console.log(`Hello, ${name}! You are ${age} years old.`);
}

greet({ name: 'John', age: 25 }); // Output: Hello, John! You are 25 years old.
greet({ name: 'Jane' }); // Output: Hello, Jane! You are 18 years old.