Course of Raku / Advanced / Subroutines / The Whatever star 🆕 / Exercises / An open-ended range

Solution: An open-ended range

Here is a possible solution to the task.

Code

say (2, 4 ... *).head(4);

🦋 You can find the source code in the file open-range.raku.

Output

(2 4 6 8)

Comments

1. The seeds 2, 4 set an arithmetic step of two, and the bare * as the endpoint means the sequence never ends.

2. head(4) pulls just the first four values, 2, 4, 6, 8. The sequence is lazy, so the unbounded tail is never computed — the bare star here means “whatever, with no upper limit”.

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