Course of Raku / Addendum 🆕 / Flow and functions / Control flow and logic / Exercises / Letter grades

Solution: Letter grades

Here is a possible solution to the task.

Code

for 95, 82, 71, 58 -> $score {
    my $grade = do given $score {
        when * >= 90 { 'A' }
        when * >= 80 { 'B' }
        when * >= 70 { 'C' }
        when * >= 60 { 'D' }
        default      { 'F' }
    }

    say "$score -> $grade";
}

🦋 You can find the source code in the file letter-grades.raku.

Output

95 -> A
82 -> B
71 -> C
58 -> F

Comments

do given turns the whole given/when into an expression whose value is the matching block — here a grade letter — which is stored in $grade.
Each when * >= N is a Whatever comparison against the topic. The first one that succeeds wins, so the boundaries only need a lower bound each.

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