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raku

How do I find all possible values of an enum in Raku?

enum Direction <north east south west>;
for north, east, south, west -> $dir {
    say $dir;
    ...
}

I don't want to repeat the list of Direction values here. How can I programmatically get this list?

I haven't found anything in the documentation. Closest is .enums, but that returns a Map of (string) key to (integer) value, not enum values.

Solution

  • If the order doesn't matter

    enum Direction <north east south west>;
Direction.pick(*).raku

    or

    enum Direction <north east south west>;
Direction::.values.raku

    Sorted by value

    enum Direction «:2north :1east :south(10) :west(9)»;
Direction.pick(*).sort.raku

    Sorted by definition; if you know first and last element

    enum Direction «:2north :1east :10south :9west»;
(north, *.succ ... west).raku;

    if you don't

    enum Direction «:2north :1east :10south :9west»;
(Direction.pick(*).first({ $_ === .pred }), *.succ ...^ * === *).raku