Course of Raku / Advanced / Control flow / Statement prefixes 🆕 / Exercises

Force eager evaluation

Problem

The eager prefix does the opposite of lazy: it forces a list to be fully produced, so it is no longer lazy. Show the contrast with .is-lazy.

Print whether the infinite range 1 .. Inf is lazy, then whether eager 1..3 is lazy, and finally whether lazy 1..3 is lazy. The results should be True, False, True.

Example

The program prints:

True
False
True

Solution

✅ See the solution

Course navigation

← Solution: The value of a do block   |   Solution: Force eager evaluation →