Problem: Simple Observable Implementation asked in Uber
Anonymous User
1359
AmazonUberNetflixFrontendJavaScriptInterview

Create a simple Observable class that implements the observer pattern. The class should:

  • Allow subscribing to data changes via a subscribe method
  • Notify all subscribers when data changes via a notify method
  • Allow unsubscribing from updates
  • Maintain a list of subscriber callbacks
const observable = new Observable();

// Subscribe to changes
const subscription = observable.subscribe(data => {
  console.log('Received:', data);
});

// Notify subscribers
observable.notify('Hello!'); // logs: "Received: Hello!"

// Unsubscribe
subscription.unsubscribe();

// No longer logs anything
observable.notify('Hello again!');

Found similar question on PrepareFrontend

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