Error Handling in javascript

Error handling uses try/catch/finally blocks and the Error object. Throw custom errors when something goes wrong and catch them at the appropriate level. In async code, combine try/catch with async/await.

Example

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

try {
  divide(4, 0);
} catch (err) {
  console.error("Error:", err.message);
}

Business rules (like 'no divide by zero') are enforced by throwing an Error; callers wrap the call in try/catch to handle failures gracefully.

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