Implement a web video playlist component. Requirements: 1) Display a list/grid of video thumbnails. 2) When a thumbnail is clicked, start playing that video and ensure all other videos stop (only one plays at a time). 3) Provide a "Play All" control that automatically plays all videos sequentially and stops at the end. Using React (functional components), outline your approach and key decisions (state with hooks, refs to players, effect handling, media event listeners). Follow-ups: - How would you optimize performance when the list contains many videos (e.g., virtualization, lazy loading, thumbnail vs. player mounting, memoization)? - How would you structure state management for clarity and scalability (lifting state, context, reducer, controlled vs. uncontrolled items)? - How would you split components and define props/interfaces to enable maintainability and extensibility (e.g., Playlist, VideoItem, Controls)? - What accessibility and browser autoplay considerations would you address?

This question evaluates frontend system design and React-specific competencies, including state management with hooks, refs and effect handling for media elements, component boundaries, performance optimizations, and accessibility considerations.

How do I approach System Design interview questions?

System Design questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master system design interviews.

What difficulty level is this interview question?

This is a medium difficulty System Design question, commonly asked during Technical Screen rounds at Netflix.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Netflix during technical interviews.

Build and optimize a video playlist component

Implement a React Video Playlist Component

Context

Design and outline a web video playlist UI using React (functional components) and the HTML5 video element. The playlist should render thumbnails, play a selected video, and support a sequential "Play All" mode.

Requirements

Display a list/grid of video thumbnails.
When a thumbnail is clicked, start playing that video and ensure all other videos stop (only one plays at a time).
Provide a "Play All" control that automatically plays all videos sequentially and stops at the end.

Use React functional components and describe your approach and key decisions for:

Managing state with hooks.
Using refs to access players.
Effect handling and media event listeners.

Follow-ups

Performance with many videos (e.g., virtualization, lazy loading, thumbnail vs. player mounting, memoization).
State management for clarity and scalability (lifting state, context, reducer, controlled vs. uncontrolled items).
Component boundaries and props/interfaces (e.g., Playlist, VideoItem, Controls).
Accessibility and browser autoplay considerations.

Requirements

Display a list/grid of video thumbnails.

When a thumbnail is clicked, start playing that video and ensure all other videos stop (only one plays at a time).

Provide a "Play All" control that automatically plays all videos sequentially and stops at the end.

Use React functional components and describe your approach and key decisions for:

Managing state with hooks.

Using refs to access players.

Effect handling and media event listeners.

Follow-ups

Performance with many videos (e.g., virtualization, lazy loading, thumbnail vs. player mounting, memoization).

State management for clarity and scalability (lifting state, context, reducer, controlled vs. uncontrolled items).

Component boundaries and props/interfaces (e.g., Playlist, VideoItem, Controls).

Accessibility and browser autoplay considerations.

Build and optimize a video playlist component

Quick Overview

Implement a React Video Playlist Component

Context

Requirements

Follow-ups

Solution

Comments (0)

Build and optimize a video playlist component

Quick Overview

Implement a React Video Playlist Component

Context

Requirements

Follow-ups

Solution

Comments (0)