Learning Redux

Handling the redo action

On a redo action, we want to do the following steps:

• Remove the first element from the future
• Insert the current present state at the end of the past
• Set the present to the element we removed from the future in the first step

Replace the return state // TODO line below case actionTypes.REDO: by doing the following:

1. First, we check whether there are elements in the future array. If not, we simply return the current state:

        if (future.length <= 0) return state

2. Next, we store the first element from the future because we will need it in the last step:

        const next = future[0]

3. Then, we create a new array from the future array, with the first element excluded:

        const newFuture = future.slice(1)

4. Next, we create a ...