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Redux Toolkit · Method

builder.addCase

createReducer makes Redux reducers shorter. It uses a builder callback to connect actions with case reducers and supports Immer-style updates.

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Syntax

createReducer(initialState, builderCallback)

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  • builder.addCase
  • builder.addAsyncThunk
  • builder.addMatcher
  • builder.addDefaultCase
  • createAction
  • createSlice

Source: createReducer | Redux. Checked 2026-11-03.