Add list ops exercise #225
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@ErikSchierboom Thank you for reviewing :) |
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| ## Hints | ||
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| The `fold-left` and `fold-right` methods are "fold" functions, which is a concept from the functional programming world. See the Wikipedia page on folding for [general background](https://en.wikipedia.org/wiki/Fold_(higher-order_function)) and [signature/implementation hints](https://en.wikipedia.org/wiki/Fold_(higher-order_function)#Linear_folds). |
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These should go into a separate hints.md file (see https://github.com/exercism/elixir/blob/main/exercises/practice/strain/.docs/hints.md for an example)
ErikSchierboom
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@fapdash You've been doing a stellar job on the emacs-lisp track. Would you be interested in becoming a maintainer? If so, please send an email to jonathan at exercism.org. He's our community manager and will sort you out. |
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@ErikSchierboom Thank you! I'm interested, I'll send Jonathan an email. :) |
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list-sum: this is just to drive the point home that you can implement functions like that very easily through the primitives implemented in this exerciselist-empty-p: I hope to bring people towards the realization that nil = empty list in Emacs Lisp, checking if thecarandcdrof a list are nil will not work.Regarding
list-empty-pwe had this discussion on slack: https://app.slack.com/client/TAN6QMALR/CAQP7JL3T/thread/CAQP7JL3T-1665705236.652139I think there should eventually b a learning / concept exercise that explains
(equal nil '())but for now it's better to have it in this exercise than not have it at all.