Learning Redux

Implementing the enhanced reducer

We now implement the enhanced reducer function, which will contain the main undo/redo logic. Edit the following function:

  return function enhancedReducer (state = initialState, action) {    // TODO  }

Replace the // TODO line by doing the following:

1. We start by destructuring the state into past, present, and future constants:

    const { past, present, future } = state

2. Next, we make a switch statement to handle multiple action types:

    switch (action.type) {      case actionTypes.UNDO: {        return state // TODO      }            case actionTypes.REDO: {        return state // TODO      }            default: {        return state // TODO      }    }