Is there a way to achieve time traveling in Clojure, for example if I have a vector (which is internally a tree implemented as a persistent data structure) is there a way to achieve time traveling and get preivous versions of that vector? Kind of what Datomic does at the database level, since Clojure and Datomic share many concepts including the facts being immutable implemented as persistent data strcutures, technically the older version of the vector is still there. So I was wondering if time traveling and getting previous versions is possible in plain Clojure similarly to what it is done in Datomic at the database level
Yes, but you need to keep a reference to it in order to access it, and in order to prevent it from being garbage collected. Clojurists often implement undo/redo in this way; all you need to do is maintain a list of historical states of your data, and then you can trivially step backward.
David Nolen has described this approach here, and you can find a more detailed example and explanation here.