How does reactivity work in Svelte stores?

How does reactivity work in Svelte stores?

In Svelte, reactivity in stores is achieved through the use of writable, readable, and derived stores. When a store's value changes, any component that subscribes to that store automatically updates.

Can you explain the difference between writable and readable stores?

Writable stores allow you to set and update their values, while readable stores are read-only and can only be subscribed to. Writable stores are useful for managing state that can change, whereas readable stores are for derived or static data.

What are derived stores and when should I use them?

Derived stores are created from one or more other stores. They automatically update when the source stores change. Use them when you need to compute a value based on other store values.

Can you give me an example of using a writable store?

Sure! You can create a writable store like this: import { writable } from 'svelte/store'; const count = writable(0); You can then update it with count.set(1) or increment it with count.update(n => n + 1);.