Created
October 15, 2022 11:56
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callback problem function passing re render react
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import React, { useState, useMemo } from "react"; | |
function Number({ number, onClick }) { | |
console.log("number render"); | |
return ( | |
<div> | |
<p>Number:{number}</p> | |
<button onClick={onClick}>Numbering</button> | |
</div> | |
); | |
} | |
function Count({ count, onClick }) { | |
console.log("count render"); | |
return ( | |
<div> | |
<p>Count:{count}</p> | |
<button onClick={onClick}>Conting</button> | |
</div> | |
); | |
} | |
function Options({ options }) { | |
console.log("options render"); | |
return <div>Options:{options}</div>; | |
} | |
function Home() { | |
const [count, setCount] = useState(0); | |
const [number, setNumber] = useState(0); | |
const options = useMemo(() => [1, 2, 3], []); | |
const handleCount = () => { | |
setCount((prev) => prev + 1); | |
}; | |
const handleNumber = () => { | |
setNumber((prev) => prev + 1); | |
}; | |
return ( | |
<div> | |
<Count count={count} onClick={handleCount} /> | |
<p>-----</p> | |
<Number number={number} onClick={handleNumber} /> | |
<p>-----</p> | |
<Options options={options} /> | |
</div> | |
); | |
} | |
export default Home; |
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