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system design
Senior
api design
#1
1. [OA] Design a Debounced EventEmitter for LinkedIn's Notifications
For LinkedIn's notification system, we need to design a Debounced EventEmitter that prevents rapid firing of events when notifications are updated. The debounce should wait a specified time period before invoking the callback for the latest event.Class Signature:
Example 1:
Constraints:
class DebouncedEventEmitter {emit(event: string, data: any): void;on(event: string, callback: Function): void;constructor(delay: number);}
Example 1:
- Initialize an event emitter with a 200ms debounce:
const emitter = new DebouncedEventEmitter(200). - Call
emitter.on('notify', (data) => console.log(data));andemitter.emit('notify', 'You have a new message!'), it should log once after 200ms of inactivity.
Constraints:
- The debounce should correctly handle multiple calls to
emitwithin the specified delay.
system design
Senior
api design
#2
2. [OA] Design a Client-Side Router for LinkedIn
With the requirement of an efficient and performant navigation system within LinkedIn's Single Page Application (SPA), design a client-side router that will help manage the navigation state and URL changes without refreshing the entire page.Class Signature:
Example 1:
Constraints:
class Router {constructor(routes: Map<string, Function>);navigate(url: string): void;on(url: string, handler: Function): void;}
Example 1:
- Initialize a Router with routes:
const router = new Router(new Map([['/', () => 'Home'], ['/profile', () => 'Profile']])) - Call
router.navigate('/')should call the handler for home and update the view accordingly.
Constraints:
- The Router should ensure that handlers for routes are invoked in order and each URL is associated with a specific view.
- Only allow paths as keys in the routes Map.
- Max 100 routes can be registered at a time.
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