how to use react memo hooks

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Souleymane
25 Jan 2020
1const computeLetterCount = word => {
2    let i = 0;
3    while (i < 1000000000) i++;
4    return word.length;
5  };
6
7  // Memoize computeLetterCount so it uses cached return value if input array ...
8  // ... values are the same as last time the function was run.
9  const letterCount = useMemo(() => computeLetterCount(word), [word]);
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Alice
10 May 2018
1function moviePropsAreEqual(prevMovie, nextMovie) {
2  return prevMovie.title === nextMovie.title
3    && prevMovie.releaseDate === nextMovie.releaseDate;
4}
5
6const MemoizedMovie2 = React.memo(Movie, moviePropsAreEqual);
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