3 ms·

The key is used by the shadow Dom for update performance; the is no shadow Dom in svelte

• afavour 5y ago
  And yet Svelte is faster than React in pretty much every benchmark I’ve seen.
  • patrickthebold 5y ago
    That makes sense though right? One would assume that shadow dom and dom would be slower than direct dom manipulation.
    • thinkloop 5y ago
      I'm not sure that's a fair assumption, one of the original sells of a shadow dom was that manipulting the dom directly is extremely slow, so doing as much work away from it is faster.
      • ttfkam 5y ago
        Because React's model requires tracking the entire DOM tree for changes and rewriting whole branches where a change is detected. Svelte bypasses the whole problem for the most part. https://youtu.be/AdNJ3fydeao?t=247 https://youtu.be/AdNJ3fydeao?t=247
• alserio 5y ago
  List diffing is done even in svelte at runtime. Keys are used the same way as any other frameworks or frontend libraries, virtual DOM or reactive.