$Bill Luebkert wrote:
> Suresh Govindachar wrote:
>
>> Hello,
>>
>> |use warnings;
>> |use strict;
>> |
>> |# Question: In the following, any suggestions for ensuring
>> |# that $stuff will be " Twice 3 is 6"?
>> |#
>> |# For example, if the here-document were re-written
>> |# to be something like:
>> |# Twice $foo is eval{2*$foo}
>> |# how would one "escape" the eval so that it would
>> |# indeed evaluate its contents?
>> |#
>> |my $foo = 3;
>> |
>> |my $stuff = <<here_doc;
>> | Twice $foo is 2*$foo
>> |here_doc
>> |
>> |__END__
>
> Either evaluate it before the here doc and use a simple vrbl or
> you could use this tricky syntax:
>
> my $stuff = <<EOD;
> Twice $foo is @{[2 * $foo]}
> EOD
I have been evaluating the expressions before the here doc,
and felt there might be a better way of evaluating inside
the here doc itself.
But what does "use a simple vrbl" mean? You mean a verbal
description?
Thanks for @{[]} -- it is better than evaluating outside the
here doc. This is because the expressions I need to evaluate
are fairly complex and the variables involved come from hashes.
Moreover, I would like to do assignments inside the here doc
that do not show up in $stuff at all, for example:
|my $foo = 3;
|my %boo=();
|
|my $stuff = <<EOD;
| @{[eval{$boo{hoo1}=5; "remove_me";}]}
| Twice $foo is @{[2 * $foo]}
| Second line
| @{[eval{$boo{hoo2}=2; "remove_me";}]}
| Third line says that \$boo{hoo1} is $boo{hoo1}.
|EOD
|
|$stuff =~ s/\s*remove_me\s*$//gm;
What is the name for the @{[]} thingie -- how can it be found
in perldoc? And is there a way to avoid the remove_me part?
--Suresh
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