Course of Raku / Addendum 🆕 / Flow and functions / Subroutines and functional style / Exercises / Describe by type

Solution: Describe by type

Here is a possible solution to the task.

Code

multi describe(Int $x) { "integer $x" }
multi describe(Str $x) { "string $x" }
multi describe(@x)     { "list of {@x.elems}" }

say describe(42);
say describe('hi');
say describe([1, 2, 3]);

🦋 You can find the source code in the file multi-describe.raku.

Output

integer 42
string hi
list of 3

Comments

Each multi gives one version of describe with a different parameter type. Raku picks the matching candidate by the type of the argument.
The @x signature matches a list, so the array dispatches to the third candidate, which reports its length.

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