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lets say you want to add an undo feature to your application if a user makes a change they dont like they can simply press undo and set the data back to its previous state but how can you track every change in the application state and how difficult will it be to reset old changes in the correct order we can use reducers to implement an undo function before we look at the details of how an undo feature will work lets first take a quick look at what a reducer actually is a reducer is just a javascript function that can modify a state object its a little like a xerox machine you pass the reducer your application state and the reducer produces a new copy of the state but unlike a xerox machine a reducer doesnt produce an exact copy of the state you give it instead the reducer returns a modified copy of the state based on the action you want it to perform for example if were building a number puzzle that allows a user to slide tiles around rather than have all of the business logic m