So, you want to interpolate a result of a method call, right?

Here is one way to do it

#!perl -w

use strict;

use Number::Format;

sub HTML_SomethingBetter {
 my $t = shift;
 my $d = new Number::Format (-thousands_sep => ',', -decimal_point =>'
+.', -decimal_fill => 2);

 return <<END;
     <tr/td code>
     @{[$d->format_number($t->{key})]}
     </tr>
END
}

print "<-- SomethingBetter -->\n";
print HTML_SomethingBetter { key => ' 3.1415956 ' };


__END__


<-- SomethingBetter -->
    <tr/td code>
     3.14
     </tr>
[download]

See also Effective Perl Programming item 58, where it is described as U.B.E.: Ugly But Effective.

My mnemonic for  @{[...]} is "All Embracing Bracketts"

Cheers
Rudif