As per React docs: If you want to re-compute some data only when a prop changes, use a memoization helper. ... <看更多>

useMemo and useCallback but with a stable cache. ... memoized values and recalculate them on next render, e.g. to free memory for offscreen components. ... <看更多>

useEffect：用來告訴React component 在render 之後要做的事情 ... useMemo：用途是當component 重新渲染時，能避免複雜的程式被重複執行. ... <看更多>