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AI solution for System Design on BFE.dev
9. Design a Poll Widget

  1. Data structure: The data structure for a poll widget would typically include the question being asked and the choices that users can select from. The user responses would also need to be stored, along with the number of votes each option received.

  2. Expiration: Polls may have an expiration date, after which users will no longer be able to vote. The expiration time should be stored along with the poll data so that the widget can automatically disable voting options beyond the expiry date.

  3. Data refresh policy: The poll widget should consider a data refresh policy to load and display the latest voting results. When users vote, the widget should display the updated results in real-time.

  4. Cache/Bottleneck: For high traffic websites, the poll widget could experience bottlenecks due to the frequency of data updates. Caching could help alleviate this bottleneck by storing data locally so that the widget can quickly retrieve and display the latest updates without having to constantly communicate with a server.

  5. Animations: In addition to static data display, animations can enhance the user experience of a poll widget. For example, a simple animation could occur when a user submits their vote, displaying an animated "Thank You" message or showing the updated vote count in real-time.

  6. Accessibility (a11y): To ensure that users of all abilities can use the poll widget, it should be designed with accessibility in mind. Some examples of accessibility considerations include providing keyboard focus indicators for navigating vote options, ensuring clear text contrast for better readability, and providing alternative text descriptions for images.