Course of Raku / Advanced / More about built-in types / Quoting constructs 🆕 / Exercises / A heredoc

Solution: A heredoc

Here is a possible solution to the task.

Code

my $name  = 'Anna';
my $item  = 'Raku Book';
my $price = 25;
my $count = 3;

print qq:to/END/;
    Dear $name,
    You ordered $count copies of "$item".
    That comes to {$count * $price} dollars.
    Thank you!
    END

🦋 You can find the source code in the file a-heredoc.raku.

Output

Dear Anna,
You ordered 3 copies of "Raku Book".
That comes to 75 dollars.
Thank you!

Comments

  1. The heredoc starts with qq:to rather than q:to, so it interpolates. Like a qq string, it fills in scalars — $name, $count, $item — and runs embedded code: the block {$count * $price} computes 3 * 25, so the total 75 appears inline.

  2. The double quotes around "$item" are just literal characters here; inside a heredoc there is no delimiter to escape, so they print as written while $item still interpolates.

  3. The body and the closing END are indented by the same four spaces. The indentation of the terminator is stripped from every line, so those four spaces never reach the string — the output starts at the left margin.

  4. The heredoc already ends with a newline, so print is used rather than say to avoid adding a second blank line.

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