Svelte · Middle · Question 2 of 75

Can you assign to a $derived value (Svelte 5.25+)?

let { post } = $props();
let likes = $derived(post.likes);

async function like() {
  likes += 1; // optimistic update
  await api.like(post.id);
}

• ✓Correct answer: Yes: the assignment temporarily overrides it until its dependencies change and it re-evaluates
• 2No: deriveds are always read-only
• 3Yes, and it permanently disconnects the derived from its expression