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Course Content

Introduction to Redux

Rules for ReducersRules for Reducers

There are certain rules while using Redux Reducers which we need to follow to avoid certain bugs or surprises.

  • Reducers should use only the state and action arguments to calculate the new state. They shouldn't access any external values;
  • Reducers must not perform asynchronous logic or side effects such as making API calls or running timers etc.;
  • The state should not be directly modified inside the reducer functions, instead, the reducer function should return a duplicate state object with updated values. This rule only applies when creating reducers manually. If we use createSlice to create a slice, we can modify the state directly.

It is important to note that in the case of createSlice reducers, we directly modify the state object, however, in the backend, Redux creates a new duplicate object and assigns it the new changes, so the rule is being followed, but in the backend.

question-icon

In which case can we directly modify the state?

Select the correct answer

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Section 3. Chapter 10