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Differences and usage scenarios between usememo and usecallback

2022-07-21 20:37:00 【Lotus awn】

useMemo and useCallback The received parameters are the same

  1. The first parameter is callback
  2. The second parameter is the data to rely on

Work together ：

Rely on data change , Will recalculate the result , That is, it plays the role of cache

Difference between them

  1. useMemo The result is return The value of coming back , It is mainly used for Cache the value of the calculation result , Application scenarios such as ： need Calculated state
  2. useCallback The result is function , It is mainly used for Cache function , Application scenarios such as : Functions that need to be cached , Because functional components are any one at a time state The change of The whole assembly Will be refreshed , Some functions do not need to be refreshed , This should be cached , Improve performance , And reduce waste of resources .
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