Svelte · Middle · Question 56 of 75

What is wrong with this `$effect`?

$effect(() => {
  if (browser) {
    window.addEventListener("resize", onResize);
  }
});

✓Correct answer: The browser check is unnecessary (effects never run on the server), and there's no cleanup; better use <svelte:window onresize>
2window can't be accessed in effects
3Nothing

Explanation

<svelte:window> adds and removes the listener for you. If you do use an effect, return a function that removes the listener.

Further reading

Test yourself

Take the Svelte · Middle quiz: questions and options are shuffled, and you get a review of your mistakes at the end.