构建 JavaScript 代码：可读性和可维护性的最佳实践

// function to greet a user
function greet(name) {
  return `hello, ${name}!`;
}

// module to handle user interactions
const usermodule = {
  greet: function(name) {
    return `hello, ${name}!`;
  },
  farewell: function(name) {
    return `goodbye, ${name}!`;
  }
};

console.log(greet("alice"));
console.log(usermodule.farewell("bob"));

// good variable names
let username = "john";
let userage = 30;

// good function name
function calculatetotal(price, quantity) {
  return price * quantity;
}

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

let result = addnumbers(3, 4);
console.log(result);

let x = 10; // assignment statement
let y = x + 5; // expression statement
console.log(y); // function call statement

// conditional statement
if (x > 5) {
  console.log("x is greater than 5");
} else {
  console.log("x is 5 or less");
}

// loop statement
for (let i = 0; i < 5; i++) {
  console.log(i);
}

let a = 10;
let b = 20;
let sum = a + b;
console.log(sum);

let a = 10
let b = 20
let sum = a + b
console.log(sum)

// this is a single-line comment
let x = 10; // assigning the value 10 to x

/*
this is a multi-line comment.
it can span multiple lines and is useful for explaining complex code.
*/
function addnumbers(a, b) {
  return a + b;
}

/**
 * Adds two numbers.
 * @param {number} a - The first number.
 * @param {number} b - The second number.
 * @returns {number} The sum of the two numbers.
 */
function addNumbers(a, b) {
  return a + b;
}