Solving Uber Frontend Interview Question | Interactive Shape | Part 2

Summary

In this follow-up video, Ysh Gupta revisits the Uber coding problem, focusing on improving the solution's flexibility. He demonstrates how to dynamically render grids using a 2D array approach, instead of a fixed 3x3 grid, allowing for scalable and adaptable outputs. The video covers key optimizations, such as refining click handling, improving memory efficiency, and reducing the time complexity of the unload method. Gupta emphasizes the importance of understanding trade-offs between flexibility and performance in coding interviews, encouraging viewers to think critically about design choices and problem-solving techniques.

Takeaways

• 😀 Dynamic grid rendering: The initial solution used a rigid 3x3 grid, but it was made flexible by handling 2D arrays, enabling dynamic grid sizes.
• 😀 Performance trade-offs: Shifting from a flat array approach to a 2D array increases time complexity from O(n) to O(n²), but improves flexibility and scalability.
• 😀 UI improvements: Boxes are rendered based on row and column values, with placeholders used for zeros to maintain grid structure.
• 😀 Efficient unload function: The previous unload function using `shift()` was optimized by using an index approach, reducing the time complexity from O(n) to O(1).
• 😀 Grid size validation: The new solution allows for any number of rows and columns, making the UI adaptable to different input configurations.
• 😀 Interview approach: The interviewer may challenge your design decisions by asking about trade-offs, so it's important to consider memory consumption and solution architecture.
• 😀 Data structure choice: The shift from flattening the array to directly iterating over 2D arrays changed the approach to rendering, making the solution more intuitive.
• 😀 Click handling improvement: The click handler was refined to account for dynamically rendered elements, ensuring that the correct state is updated when a box is selected or deselected.
• 😀 Error handling: While updating the unload function, Gupta highlights how to handle cases where the index exceeds array bounds, breaking the loop safely.
• 😀 Code cleanup: Dead code and unnecessary CSS classes were removed to simplify the solution and improve readability and maintainability.

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