This is the fifth post on Data Structures as part of my long Tech Tuesday series on programming. And today we finally make it to a structure known as an object. There is a whole literature on so-called object oriented programming, which sometimes seems like a modern idea because of its prominence in the 1990s but really goes much further back than that with programming languages such as Smalltalk in the 1970s and basic object concepts go back even earlier than that. While another approach kno...