tricky use of print?

[Ela]

I found that little can be done on debugging a variable on print, after
visiting a page containing the module PadWalker.

I wonder whether in Perl can do something like:

$newline = '\n'

print
foo
$foo

print $newline;


I use the vim editor, in this sense, rapid coding and debugging can achieve.
But i at least know that the newline trick doesn't work...

 

[szr]

In Perl, single-quotes are not interpolated (meaning $newline is set
to backslash-n). You would need to use double-quotes (or qq{}) to
interpolate \n as a newline.

Or a heredoc

print <<_EOF_;
$foo $bar
_EOF_

 

[Ela]

Or a heredoc

print <<_EOF_;
$foo $bar
_EOF_

There are too few words in your example and I'm unable to follow/Google. I
guess maybe you are telling something important? thx

 

[szr]

szr is just showing you an example of how to use a heredoc, which
recognizes the \n at the end of any lines within it (so it's just
another way of printing newlines).

I should of also said, you can either physically have new lines, like:

print <<_EOF_;
A
B
C
_EOF_


Or you can use \n instead:

print <<_EOF_;
A\nB\nC
_EOF_


Or mix and match:

print <<_EOF_;
A
B\nC
_EOF_


Either way you get:

$ perl -e 'print <<_EOF_;

A
B\nC
_EOF_'

A
B
C

 

[Tad J McClellan]

There are too few words in your example and I'm unable to follow/Google. I
guess maybe you are telling something important? thx

See the "<<EOF" section in perlop.pod.