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Abilities tutorial: exercise answers for map, filter, take #267
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* The answer for the `take` exercise was missing. * `map` and `filter` were only implemented in terms of `pipe` (which is a "very challenging" exercise) and therefore made the tutorial hard to follow, IMHO. So I added basic implementations and renamed the existing ones. * TODO: implement `take'` in terms of `pipe`
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takeexercise was missing.mapandfilterwere only implemented in terms ofpipe(which is a "very challenging" exercise) and therefore made the tutorial hard to follow, IMHO. So I added simpler implementations and renamed the existing ones.sum'a bit up, reflecting the order of the exercises in the tutorial.I implemented the answers myself, hopefully in an idiomatic way. The function signatures in the base library slightly differ from the tutorial exercises and their implementation is not straightforward, so I did not use those.
I could not find any contribution guidelines... I just worked through the exercises and noticed the answers could be improved. If this PR is not very useful, feel free to reject it. I am also happy to receive feedback how to change it. Oh and I am not sure which branch to compare the PR against, is master correct?
Note that the solution for
takeusingpipeis still missing. I couldn't come up with one. Very challenging indeed. ;) Otherwise an excellent, fun tutorial!