> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/perl6-rosettacode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/perl6-rosettacode/programming_tasks/s/string_interpolation_included.md).

# String interpolation included

```perl
my $extra = "little";
say "Mary had a $extra lamb";           # variable interpolation
say "Mary had a { $extra } lamb";       # expression interpolation
printf "Mary had a %s lamb.\n", $extra; # standard printf
say $extra.fmt("Mary had a %s lamb");   # inside-out printf
my @lambs = <Jimmy Bobby Tommy>;
say Q :array { $$$ The lambs are called @lambs[]\\\.} # only @-sigiled containers are interpolated
```