पैरामीटर, डिफ़ॉल्ट, रेस्ट और रिटर्न

// Default parameter
function welcome(name = "Guest") {
  // If no name is given, "Guest" is used
  console.log("Welcome, " + name);
}

welcome("Mina");
welcome();

// Rest parameter: gather extra args into an array
function sum(...nums) {
  // nums is an array of all arguments
  let total = 0;
  for (const n of nums) {
    total = total + n;
  }
  return total;
}

console.log("Sum A:", sum(1, 2));
console.log("Sum B:", sum(1, 2, 3, 4));

// Return a value clearly
function areaOfRectangle(w, h) {
  // Validate simple inputs
  if (typeof w !== "number" || typeof h !== "number") {
    return 0;
  }
  // Compute and return the result
  const area = w * h;
  return area;
}

console.log("Area:", areaOfRectangle(3, 4));
console.log("Area bad:", areaOfRectangle("3", 4));