Learning Redux

Handling generic undo/redo actions

For our new history object, we will need a new undo/redo algorithm. It should be generic that is work on all data types T with the following state structure:

{  past: Array<T>,  present: T,  future: Array<T>}

There will be three cases that our higher-order reducer needs to handle:

• An undo action
• A redo action
• All other actions (in this case, we need to update the present state)