Last active
July 1, 2021 09:19
-
-
Save brickpop/477f56f597046dac8730ce2cdde92da6 to your computer and use it in GitHub Desktop.
React Hooks quick examples
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// THE CONTEXT REFERENCE | |
const MyCounterContext = createContext<{ counter: number, setCounter: (n: number) => void }>({ counter: 0, setCounter: () => { } }) | |
// PROVIDES ITS STATE TO CHILDREN COMPONENTS | |
const MyParent = ({ children }) => { | |
const [counter, setCounter] = useState(0) | |
return <MyCounterContext.Provider value={{ counter, setCounter }}> | |
{children} | |
</MyCounterContext.Provider> | |
} | |
// CONSUMES VALUES FROM ITS PARENT(S) | |
const MyChildren = () => { | |
const { counter, setCounter } = useContext(MyCounterContext) | |
return <p onClick={() => setCounter(counter + 1)}>hola {counter}</p> | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// MAIN COMPONENT | |
const IndexPage = () => { | |
return ( | |
<div> | |
<MyParent> | |
<MyChildren /> | |
<MyChildren /> | |
<MyChildren /> | |
<MyChildren /> | |
<MyChildren /> | |
<MyChildren /> | |
<MyChildren /> | |
<MyChildren /> | |
<MyChildren /> | |
</MyParent> | |
</div> | |
) | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// Splitting data logic from UI components | |
// Composable hooks | |
const useMyComponents = () => { | |
const [inputText, setInputText] = useState<string>("") | |
const [strings, setStrings] = useState<string[]>([]) | |
const [stringCount, setStringCount] = useState<number>(0) | |
const [clickCounter, setClickCounter] = useState<number>(0) | |
const textChanged = (txt: string) => setInputText(txt) | |
const onClick = () => { | |
setStrings([].concat(strings).concat(inputText)) | |
setClickCounter(clickCounter + 1) | |
} | |
const cleanStrings = () => setStrings([]) | |
useEffect(() => { | |
setStringCount(strings.length) | |
// API CALL | |
}, [strings.join(",")]) | |
return { | |
strings, | |
stringCount, | |
clickCounter, | |
textChanged, | |
onClick, | |
cleanStrings | |
} | |
} | |
// Simple UI component consuming data | |
const MyComponent = (props: { children: ReactNode, name?: string }) => { | |
const { strings, stringCount, clickCounter, textChanged, cleanStrings, onClick } = useMyComponents() | |
return <div> | |
<input type="text" onChange={e => textChanged(e.target.value)} /> | |
<Button onClick={onClick}>Next</Button> | |
<Button onClick={cleanStrings}>Clean</Button> | |
<p>Strings: {strings.join(", ")}</p> | |
<p>Strings count: {stringCount}</p> | |
<p>Click counter: {clickCounter}</p> | |
</div> | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment