js带参数的function

function greet(name) {
    console.log('Hello, ' + name);
}

function sum(a, b = 10) { // 可选参数
    return a + b;
}

function total(...numbers) { // 剩余参数
    return numbers.reduce((acc, val) => acc + val, 0);
}

function add(x, y) {
    if (typeof x !== 'number' || typeof y !== 'number') {
        throw new Error('Both arguments must be numbers');
    }
    return x + y;
}

function multiply(a, b = 1) {
    return a * b;
}

function printUserInfo(user) {
    if (user && user.name) {
        console.log(user.name);
    } else {
        console.log('User information is missing');
    }
}

// 定义一个带参数的函数
function calculate(operation, a, b) {
    switch (operation) {
        case 'add':
            return a + b;
        case 'subtract':
            return a - b;
        case 'multiply':
            return a * b;
        case 'divide':
            return a / b;
        default:
            throw new Error('Invalid operation');
    }
}

// 调用函数并传递参数
console.log(calculate('add', 5, 3)); // 输出: 8
console.log(calculate('subtract', 5, 3)); // 输出: 2