If a store is writable — i.e. it has a set method — you can bind to its value, just as you can bind to local component state.
In this example we're exporting a writable store name and a derived store greeting from stores.js. Update the <input> element in App.svelte:
App.svelte
<input bind:value={$name}>Changing the input value will now update name and all its dependents.
We can also assign directly to store values inside a component. Add an on:click event handler to update name:
App.svelte
<button on:click={() => $name += '!'}>
Add exclamation mark!
</button>The $name += '!' assignment is equivalent to name.set($name + '!').