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hello this is Chris Minich with web Decatur in this video Im going to show you how to create a simple undo in JavaScript using immutable J s this video was inspired by a blog post by Tom macwrite which is available at the URL shown here if you want to create undo and redo features in a JavaScript application you have to deal with managing history it may appear simple but it presents a particular challenge in his post tom shows an example of a simple application that has an undo and redo feature here you can add dots to the screen and then use undo and redo to step through the history the principles of undo redo our data is immutable it should never be mutated in place changes to data are encapsulated into operations that take a previous version and return a new one history is represented as a list of states with past and one end the present on the other and an index I can back up into undo States modifying data such as undoing and then adding new dots causes any future states to be t
