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Provide a last function for lists #138

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heueristik opened this issue Nov 6, 2024 · 2 comments · May be fixed by #139
Open

Provide a last function for lists #138

heueristik opened this issue Nov 6, 2024 · 2 comments · May be fixed by #139

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@heueristik
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There is a head function

head {A} (defaultValue : A) (list : List A) : A :=
  case list of
    | x :: _ := x
    | nil := defaultValue;

but no

last {A} (defaultValue : A) (list : List A) : A :=
  head@{
    defaultValue;
    list := reverse list;
  };
@mariari
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mariari commented Nov 7, 2024 •
edited
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#139 fixes this issue

@mariari mariari linked a pull request Nov 7, 2024 that will close this issue
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@lukaszcz
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I don't think we should have last. There are few legitimate use-cases for it. It's most often used incorrectly by beginners when they try to use lists as if they were arrays.

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Add the last function mariari/juvix-stdlib
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@lukaszcz @heueristik @mariari