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Created July 23, 2019 00:11
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Sample code for a blog post about Optimizing Performance in React 18.6
import React from "react";
const BigGrid = ({ number }) => {
...
};
export default React.memo(BigGrid);
const BigGrid = ({ numbers }) => {
...
};
<BigGrid numbers={[firstNumber, secondNumber]} />
const numbers = React.useMemo(() => [firstNumber, secondNumber], [firstNumber, secondNumber]);
<BigGrid numbers={numbers} />
const [x, setX] = useState(1);
const logX = useCallback(() => console.log(x), [x]);
return <SomeComponent onClick={logX} />
const numbers = React.useMemo(() => [firstNumber, secondNumber], [firstNumber, secondNumber]);
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