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Forget about component lifecycles and start thinking in effects  ↦

Great description of how the Hooks API leads us from an imperative style of implementing side effects (“Do thing x on mount, do thing y on unmount”) to a declarative style of implementing side effects.

Author Sebastian De Deyne puts it this way:

Instead of thinking about when we should apply the side effect, we declare the side effect’s dependencies. This way React knows when it needs to run, update, or clean up.


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