Callbacks & Callback Hell

What callback practice is demonstrated here?

function loadUser(callback) {
  return callback(new Error('User not found'));
}

function handleUser(callback) {
  loadUser((error) => {
    if (error) {
      return callback(error);
    }
    // Process user
  });
}

Callback chaining
Error propagation
This code demonstrates proper error propagation in callback chains. Key practices: 1) Early return with error in callbacks prevents executing further code, 2) Errors are passed up the callback chain, 3) Each callback level can handle or propagate errors as needed, 4) Maintains consistent error handling pattern across async operations, 5) Follows Node.js error-first callback convention. This pattern is crucial for proper error handling in callback-based asynchronous code.
Asynchronous execution
Callback hell

Next Question (8/20)