Microsoft Frontend Engineer System Design Questions

For Azure DevOps, implement a lightweight client-side router that allows navigation between different dashboard components without a full page reload. The Router class should support the following methods:
- addRoute(path: string, handler: Function): void: Adds a new route with its corresponding handler function.
- navigate(path: string): void: Navigates to the specified path and invokes the associated handler.Example 1:
Input: const router = new Router(); router.addRoute('/home', () => console.log('Welcome to Home')); router.navigate('/home');
Output: Welcome to Home
Explanation: Adding a route for /home and then navigating to it triggers the corresponding handler.Constraints:
- At most 100 routes can be added.
- Route paths will always be unique and valid.

To enhance the performance of OneDrive, implement an LRU (Least Recently Used) Cache that stores recently accessed files. The cache should have a maximum size and remove the least recently used file whenever a new file is added beyond that limit.
Define the LRUCache class with the following methods:
- get(fileID: int) -> str: Retrieves the file content for the given file ID and updates its usage.
- put(fileID: int, content: str) -> None: Stores the file content in the cache. If the cache exceeds the size, remove the least recently used file.Example 1:
Input: const lruCache = new LRUCache(2); lruCache.put(1, 'File1'); lruCache.put(2, 'File2'); lruCache.get(1);
Output: 'File1'
Explanation: Accessing file 1 keeps it in the cache while file 2 is also stored.Constraints:
- Cache size will be at most 3000 files.
- Each fileID will be unique.