[sf-perl] Odd behavior for dot operator?

Andrew Sigmund ASIGMUND at altera.com
Thu Mar 17 22:55:58 PDT 2011

First, I realize that I can (& should) use "join" for something like this, and "join" behaves as I expect here. Nevertheless, I'm interested to get an explanation for this behavior:


# baseline code
%perl -w
$x = (defined $y)? $y :'undef' ."\n";
print $x;
undef    # This is what I expect.

# a minor change
%perl -w
$x = 'a' . (defined $y)? $y :'undef' ."\n";  # now I try to put something up front
print $x;
Use of uninitialized value $x in print at - line 4.  # and I get slapped.


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