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/* providers/BeerProvider.jsx */ | |
import React, {createContext, useCallback, useMemo, useState} from 'react'; | |
export const BeerContext = createContext(); | |
const BeerProvider = (props) => { | |
const [isAvailable, setIsAvailable] = useState(true); | |
const toggleAvailability = useCallback(() => setIsAvailable(!isAvailable), [isAvailable, setIsAvailable]); | |
const value = useMemo(() => { | |
actions: {setIsAvailable, toggleAvailability}, | |
values: {isAvailable} | |
}, [isAvailable, setIsAvailable, toggleAvailability]); | |
return ( | |
<BeerContext.Provider {...props} value={value} /> | |
); | |
} | |
export default BeerProvider; | |
/* components/Beer.jsx */ | |
import React, {useContext} from 'react'; | |
import { BeerContext } from '../providers/BeerProvider'; | |
const Beer = ({ isAvailable }) => { | |
const {actions, values} = useContext(BeerContext); | |
return ( | |
<> | |
<div> | |
I'm currently | |
{values.isAvailable ? ' ' : ' not '} | |
available for a beer | |
</div> | |
<button onClick={actions.toggleAvailability}>Change</button> | |
</> | |
); | |
} | |
export default Beer; |
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