React HooksLesson 52Free preview

React useCallback

This lesson is part of React · All levels

Summary

UseCallback memoizes the function to not be recreated on each render, as long as its dependence remains unchanged. This is important when the function is passed to the wrapped child component so that the props comparison is not considered to be changed. Use it enough because self-molding has a cost.

Key points

The shape of the function returns the function
Useful with the effect of dependency
The function is recreated only when the value dependency changes
Over-memoization is actually adding to the complexity of the code.

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