How to Combine Stores Together in Svelte

How to Combine Stores Together in Svelte

Ferenc Almasi β€’ 2020 October 18 β€’ Read time 1 min read
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In Svelte, you can use a derived store, if you want a store to have a value based on other stores. This way, you can combine multiple stores together.

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<script>
    import { writable, get, derived } from 'svelte/store'
	
    const vegetables = writable(['πŸ₯•', 'πŸ₯’', 'πŸ₯”']);
    const fruits     = writable(['πŸ₯', 'πŸ“', 'πŸ…']);
	
    const derivedFood = derived([vegetables, fruits], ($values, set) => {
        set([...$values[0], ...$values[1]]);
    });

    const set = () => fruits.set(get(fruits).concat(β€˜πŸŠβ€™))
	
    // fruits has changed but this will still log out
    // [β€œπŸ₯•β€, β€œπŸ₯’”, β€œπŸ₯””, β€œπŸ₯β€, β€œπŸ“β€, β€œπŸ…β€, β€œπŸŠβ€]
    derivedFood.subscribe(value => console.log(value));
</script>

<button on:click={set}>Add fruit</button>
Store.svelte

When one of the store's value changes, the derive store can be notified through a subscribe method.

How to Combine Stores Together in Svelte
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