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Re^2: Hash element exists/delete

by tmharish (Friar)
on Jan 22, 2013 at 09:58 UTC ( #1014613=note: print w/replies, xml ) Need Help??

in reply to Re: Hash element exists/delete
in thread Hash element exists/delete

Can you tell me what I am doing wrong:

$ perl -e 'use strict; use warnings; my $one = 1; my $two = 2; if( $on +e = $two ) { print "True\n"; } else { print "False\n"; } ' True $

I get no warnings!

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Re^3: Hash element exists/delete (= in conditional)
by LanX (Sage) on Jan 22, 2013 at 10:54 UTC
    Because it's valid code, $two could be a boolean to be tested and as a side-effect $one is set.


    perl -e 'use strict; use warnings; my $one = 1; if( $one = 2 ) { prin +t "True\n"; } else { print "False\n"; } ' Found = in conditional, should be == at -e line 1. True


    perl -we '$a=1; print (($a = 2) ? "True" : "False");' Found = in conditional, should be == at -e line 1.

    cause now it makes less sense.


    Cheers Rolf


    And personally I would be glad if this would cause a warning, too!

Re^3: Hash element exists/delete
by tobyink (Canon) on Jan 22, 2013 at 10:23 UTC

    Only warns in more complex conditionals...

    perl -we'if ($z=1 or $z=2) { 1 }'

    ... I'm not sure of the exact set of circumstances that triggers it.

    package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

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