Why action changes wrong fields in state redux?

Question

React

Essence of the question. There is an Action SET_USER_PREVIEW which has an object with information about the user in its payload.



In the reducer, I put this information in the state. For state, I only change one field (currentUser),


but reduxDevToll shows that I have changed several fields. Why is this happening

Answer 1

You are changing not just currentUser, but messageReduser.currentUser. Well, that is, messageReduser also changes.
Yes, redux, immutability, that's all.