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How to Average in Prolog (2017)
If I had to average a list of numbers, I would probably do it like this: This resembles the actual mathematical definition. Then you could just make
But of course, this is for a class and the important thing is to not use Prolog or learn declarative programming or solve actual problems but rather to perform meaningless inductive calisthenics to prove you understand recursion. The list result of my findall/3 must be delicately hand-assembled using only tools available in the 18th century lest anyone develop a sense that Prolog can be used effectively in fewer than 40 lines of code: Now, of course, it will be pointed out that the introduction of additional predicates that are not directly answers to the take home assignment are illegitimate and will be penalized as doing such leads to readability, maintainability, breaking problems down into manageable pieces and other things that are not directly related to the goal of the assignment (to make Prolog appear tedious yet opaque) so we could now look at this and realize that if we want to flatten these two predicates together we ought to be able to by just smushing together their state variables and doing all the work of both, like this:
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