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Re^2: Hash Printing reveals Hash Memory Location

by tobyink (Canon)
on Feb 03, 2012 at 07:51 UTC ( #951623=note: print w/replies, xml ) Need Help??


in reply to Re: Hash Printing reveals Hash Memory Location
in thread Hash Printing reveals Hash Memory Location

The expression $english && $foreign will evaluate to either true (1) or false ("") but will never be equal to '-1'.

Wrong. The "&&" operator doesn't return 1 or "". It returns the expression on the right side of "&&" if and only if both expressions are true.

use 5.010;
my $english = 'foobar';
my $foreign = -1;
say ($english && $foreign);  # says "-1"
say ($foreign && $english);  # says "foobar"

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Re^3: Hash Printing reveals Hash Memory Location
by lidden (Curate) on Feb 04, 2012 at 00:59 UTC
    It returns the expression on the right side of "&&" if and only if both expressions are true.
    It returns the expression on the right side if the expression on the left side is true. 
    $ perl -E 'say "Yes" if "Foo" && 0 eq 0' # says "Yes"
$ perl -E 'say "Yes" if "Foo" && "" eq ""' # says "Yes"
$ perl -E 'say "Yes" if "Foo" && 0 eq ""' # Nothing

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