Course of Raku / Advanced / More about built-in types / Enumerations 🆕 / Exercises / Weekday numbers

Solution: Weekday numbers

Here is a possible solution to the task.

Code

enum Day (Mon => 1, Tue => 2, Wed => 3, Thu => 4, Fri => 5);

say Day(5);
say Day(1);

🦋 You can find the source code in the file weekday-values.raku.

Output

Fri
Mon

Comments

Writing the constants as pairs lets you choose the numbers, here starting from 1.
Calling the enum type as Day(5) performs the reverse lookup: it finds the constant whose value is 5, which is Fri. Likewise Day(1) gives Mon. This is the inverse of Fri.value, which would go from the name to the number.

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