Raku Books / Creating a Compiler in Raku / Arrays and Hashes

Printing arrays

Another thing, which is really desired for arrays, is to allow print them at once. Instead of listing separate elements, we’d like to pass the whole array to the say function:

my data[] = 5, 7, 9;
say data;

In fact, Raku can already do that, because our implementation of say just passes the whole container to Raku’s say, which prints the data like this:

[5 7 9]

Let us be less humble and create our own output format by checking the type of the variable, as we did before:

method function-call($/) {
    my $object = $<value>.made;

    if $object ~~ Array {
        say $object.join(', ');
    }
    else {
        say $object;
    }
}

This function prints the array as a comma-separated list of its items:

5, 7, 9

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