Course of Raku / Addendum 🆕 / Flow and functions / Subroutines and functional style / Exercises / Sort by two keys

Solution: Sort by two keys

Here is a possible solution to the task.

Code

my @people =
    { name => 'Anna', age => 30 },
    { name => 'Bob',  age => 25 },
    { name => 'Cara', age => 30 };

for @people.sort({ .<age>, .<name> }) -> %person {
    say "%person<name> (%person<age>)";
}

🦋 You can find the source code in the file sort-by-two-keys.raku.

Output

Bob (25)
Anna (30)
Cara (30)

Comments

When a .sort block returns a list, Raku compares by the first element, then the second — so { .<age>, .<name> } sorts by age first and uses the name only to break ties.
Anna and Cara share age 30, so they are ordered alphabetically; Bob, being younger, comes first.

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