open:svelte-store [EL]

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# Svelte Store

### custom stores

<code>
import { writable } from 'svelte/store';

function createCount() {
	const { subscribe, set, update } = writable(0);

	return {
		subscribe,
		increment: () => update(n => n + 1),
		decrement: () => update(n => n - 1),
		reset: () => set(0)
	};
}

export const count = createCount();
</code>

<code>
<script>
	import { count } from './stores.js';
</script>

<h1>The count is {$count}</h1>

<button on:click={count.increment}>+</button>
<button on:click={count.decrement}>-</button>
<button on:click={count.reset}>reset</button>
</code>

### writable stores

- https://svelte.dev/tutorial/writable-stores

<code>
<script>
import { writable } from 'svelte/store';

export const count = writable(0);


const unsubscribe = count.subscribe(value => {
	count_value = value;
});

function decrement() {
	count.update(n => n - 1);
}

function reset() {
	count.set(0);
}
</script>
</code>