Robust code anticipates failure. Use try/catch/finally to handle errors gracefully. Defensive programming means handling problems before they crash the program.

• try — run code that might throw
• catch — handle the error
• finally — always runs, perfect for cleanup

try {
  const result = JSON.parse('{invalid json}');
} catch (error) {
  console.log('Caught error:', error.message);
} finally {
  console.log('Cleanup done');
}

Run the example, then write a try/catch block that handles a custom error with throw new Error('message').

Robust code anticipates failure. Use try/catch/finally to handle errors gracefully. Defensive programming means handling problems before they crash the program.

• try — run code that might throw
• catch — handle the error
• finally — always runs, perfect for cleanup

try {
  const result = JSON.parse('{invalid json}');
} catch (error) {
  console.log('Caught error:', error.message);
} finally {
  console.log('Cleanup done');
}

Run the example, then write a try/catch block that handles a custom error with throw new Error('message').