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Today I am going to talk about maps, not the java.util.Map, but, map as in map-reduce or map as in scala.List.map. Of course all of us know what map is and map does, and how this powerful concept has been used in all functional languages that we use on a regular basis. I will talk maps in the context of its implementation, as we find in all the languages, which brings out some of the important principles of using tail recursion.