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Postings from April 2012
On 04/03/2012 06:55 PM, timothy adigun wrote:
> Hi Stan,
> Please check my comments below:
> On Tue, Apr 3, 2012 at 10:39 PM, Stan N/A<stan100@gmail.com> wrote:
>
>> I've run into a weird issue where the ternary operator isn't doing
>> what I believe it normally would and need some help understanding the
>> issue. I'm sure I'm missing some critical point, but perhaps this is
>> an issue with perl. Here's a short 14 line script exemplifying the
>>
> issue:
>>
>> -----code-----
>> #!/usr/bin/perl
>> use strict;
>> use warnings;
>>
>> my %test = (
>> one => "first",
>> two => "second"
>> );
>>
>> $test{one} eq "first" ?
>> $test{one} .= " is the worst\n" :
>> $test{two} .= " is the best\n";
>>
>
> $test{one} eq "first" ?
> $test{one} .= " is the worst\n" :
> ( $test{two} .= " is the best\n");
>
that is the wrong way to fix this even if it works.
the ternary operator is meant to return a single value from a choice of
two expressions. it is not meant for side effects like assignment or sub
calls that do things. use if/else for that. the correct answer here is
to use if/else as the assignments go to different places.
if( $test{one} eq 'first' ) {
$test{one} .= " is the worst\n" ;
else {
$test{two} .= " is the best\n";
}
that code is not a good use of ?: at all so use if/else.
uri
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