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| import React from 'react'; | |
| const SpicyCtx = React.createContext(null); | |
| // custom provider | |
| export const SpicyProvider = ({ children }) => { | |
| const [spice, setSpice] = React.useState("scary"); | |
| const api = { | |
| gingerSpice: () => setSpice("ginger"), | |
| sportySpice: () => setSpice("sporty") | |
| }; | |
| return ( | |
| <SpicyCtx.Provider value={{ spice, ...api }}>{children}</SpicyCtx.Provider> | |
| ); | |
| }; | |
| // custom hook | |
| export const useSpicyState = () => { | |
| const ctx = React.useContext(SpicyCtx); | |
| if (!ctx) { | |
| throw new Error("useSpicyState must be used within the SpicyProvider"); | |
| } | |
| return ctx; | |
| }; | |
| // in another file | |
| import { useSpicyState, SpicyProvider } from 'a-special-place'; | |
| const BlandFood = () => { | |
| const { spice } = useSpicyState(); | |
| return <>{spice}</>; | |
| }; | |
| const SpiceButtons = () => { | |
| const { sportySpice, gingerSpice } = useSpicyState(); | |
| return ( | |
| <> | |
| <button type="button" onClick={sportySpice}> | |
| Sporty | |
| </button> | |
| <button type="button" onClick={gingerSpice}> | |
| Ginger | |
| </button> | |
| </> | |
| ); | |
| }; | |
| const App = () => ( | |
| <SpicyProvider> | |
| <div> | |
| <BlandFood /> | |
| <SpiceButtons /> | |
| </div> | |
| </SpicyProvider> | |
| ); |
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