জাভাস্ক্রিপ্ট এরর হ্যান্ডলিং

try {
  // এমন কোড যা এরর থ্রো করতে পারে
} catch (error) {
  // এরর হ্যান্ডেল করার কোড
}

try {
  let result = someUndefinedVariable + 10;
} catch (err) {
  console.log("Something went wrong:", err.message);
}

Something went wrong: someUndefinedVariable is not defined

try {
  console.log("Trying something risky");
} catch (err) {
  console.log("Error happened!");
} finally {
  console.log("Always runs!");
}

function divide(a, b) {
  if (b === 0) {
    throw new Error("Cannot divide by zero");
  }
  return a / b;
}

try {
  console.log(divide(10, 0));
} catch (err) {
  console.log("Caught:", err.message);
}

function validateAge(age) {
  if (isNaN(age)) throw new Error("Age must be a number");
  if (age < 18) throw new Error("You must be at least 18");
  return true;
}
                              
try {
  validateAge("hello");
} catch (err) {
  console.log("Validation error:", err.message);
}

try {
  try {
    throw new Error("Original error");
  } catch (err) {
    console.log("Logging:", err.message);
    throw err; // আবার থ্রো করা হচ্ছে
  }
} catch (e) {
  console.log("Final catch:", e.message);
}

async function fetchData() {
  try {
    let res = await fetch("https://invalid-url.com");
    let data = await res.json();
  } catch (error) {
    console.log("Network or JSON error:", error.message);
  }
}