svelte/documentation/tutorial/08-stores/06-store-bindings/text.md

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Store bindings

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 have a writable store name and a derived store greeting. Update the <input> element:

<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 a <button> element:

<button on:click={() => ($name += '!')}> Add exclamation mark! </button>

The $name += '!' assignment is equivalent to name.set($name + '!').