How to reset store

This tutorial will guide you on how use useProvider hook to reset the store in the provider. useProvider is a React hook that helps find the nearest StoreProvider that contains the specified hook in the component tree and returns a Provider object for managing the store within the provider.

In this tutorial, we'll create a simple Product component that contains two sub components: Label and Updater. The Label component displays the current count and price, while the Updater component allows you to update the count and price.

Setup

Add Houp in you project.

npm install houp

Create useCount and usePrice hook

useCount.tsx

import { useState } from "react";

export default function useCount() {
    const [count, setCount] = useState(10);

    return {
        count,
        setCount,
    };
}

usePrice.tsx

import { useState } from "react";

export default function usePrice() {
    const [price, setPrice] = useState(5);

    return {
        price,
        setPrice,
    };
}

Create a Provider and add it to your app

provider.ts

import useCount from "./useCount";
import usePrice from "./usePrice";
import { createProvider } from "houp";

export const Provider = createProvider([useCount, usePrice]);

index.tsx

import { StrictMode } from "react"
import { createRoot } from "react-dom/client"
import App from "./App"
import { Provider } from "./provider";

createRoot(document.getElementById("root")!).render(
  <StrictMode>
    <Provider>
      <App />
    </Provider>
  </StrictMode>,
)

Create the Product component

The Updater component has seven buttons: count+1, count-1, reset count, price+1, price-1, reset price and reset all.

The count+1 button increases the count by 1, and the count-1 button decreases the count by 1.

The reset count button resets the count to 10.

The price+1 button increases the price by 1, and the price-1 button decreases the price by 1.

The reset price button resets the price to 5.

The reset all button resets the count to 10 and the price to 5.

product.tsx

import { useProvider, useStore } from "houp";
import useCount from "./useCount";
import usePrice from "./usePrice";


function Label() {
    const countStore = useStore(useCount);
    const priceStore = useStore(usePrice);

    return (
        <>
            <div>Count: {countStore.count}</div>
            <div>Price: {priceStore.price}</div>
        </>
    );
}

function Updater() {
    const countStore = useStore(useCount);
    const priceStore = useStore(usePrice);
    const provider = useProvider(useCount);
    // const provider = useProvider(usePrice);

    return (
        <>
            <button onClick={() => countStore.setCount(n => n + 1)}>count+1</button>
            <button onClick={() => countStore.setCount(n => n - 1)}>count-1</button>
            <button onClick={() => provider.resetStore(useCount)}>reset count</button>
            <button onClick={() => priceStore.setPrice(n => n + 1)}>price+1</button>
            <button onClick={() => priceStore.setPrice(n => n - 1)}>price-1</button>
            <button onClick={() => provider.resetStore(usePrice)}>reset price</button>
            <button onClick={() => provider.resetAllStore()}>reset all</button>
        </>
    );
}

export default function Product() {
    return (
        <>
            <Label />
            <Updater />
        </>
    );
}

信息

useProvider(useCount) and useProvider(usePrice) will return the same Provider object because they are within the same provider.

Count: 10

Price: 5

备注

If your store has side effects, resetting it will trigger the effect again. For example, with the useCount store, the useCount mounted message will be logged after the reset.

import { useState, useEffect } from "react";

export default function useCount() {
    const [count, setCount] = useState(5);

    useEffect(() => {
        console.log("useCount mounted");
    }, []);

    return {
        count,
        setCount,
    };
}

Full Example

Here's the complete example, running on CodeSandbox.