Course of Raku / Advanced / Subroutines / Calling with a colon 🆕 / Exercises / Join with a colon

Solution: Join with a colon

Here is a possible solution to the task.

Code

say <a b c>.reverse.join: '-';

🦋 You can find the source code in the file colon-join.raku.

Output

c-b-a

Comments

.reverse keeps its ordinary form because it is in the middle of the chain. join comes last, so it can use the colon, passing '-' exactly as join('-') would.
The list reversed to c, b, a is then joined with dashes, giving c-b-a. The colon form works with ordinary values, not only blocks.

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