Idea for new exercise (Polar bear)

[rmunn]

I originally submitted this idea as exercism/fsharp#164, but it really belongs here.

There are already three exercises with the basic idea of "Here is some text with a repeating pattern; write a function to print out that text". So a fourth one may not be useful. However, if a fourth such exercise would be useful, this Code Golf challenge could be turned into such an exercise:

http://codegolf.stackexchange.com/questions/85746/polar-bear-polar-bear-what-do-you-hear

The one thing this exercise would contain that the others wouldn't is that the "a / an" distinction in English would be relevant, and you can't easily "cheat" by baking it into the stored data. So you'd need a helper function of some kind to turn "Polar Bear" into "a polar bear", but "Elephant" into "an elephant".

The Python 3 implementation of that Code Golf puzzle includes a non-golfed version, which could easily be turned into sample code in most languages. So it shouldn't take too much work to implement this exercise if someone wants to take it on.

It's also worth having a discussion on whether three (or four!) text-based exercises are too many, and whether they should be merged or any of them should be dropped (including this idea, of course). But I'll open a separate issue for that discussion.

[rmunn]

Actually, there are four, not three: I forgot the food-chain exercise in my first comment.