Re: What is this called: ($myvar->{otherid}) ? 'stringA' : 'stringB';

[drieux]

On Thursday, Nov 20, 2003, at 12:18 US/Pacific, Jeff Kowalczyk wrote:

I'm not yet able to read certain parts of perl code. What is this
comparison/alternation after the hash lookup on 'otherid' called, and 
what
does the code do?

$myvar->{id} = ($myvar->{otherid}) ? 'stringA' : 'stringB';

it is short for

        if ($myvar->{otherid})
        {
                $myvar->{id} = 'stringA';
        }else{
                $myvar->{id} = 'stringB';
        }
so you too might like Data::Dumper and go with
a short script like:
        #!/usr/bin/perl -w
        use strict;
        use Data::Dumper;
        # #FILENAME# - is for
        
        
        my $myvar = { otherid => 'bob', id => 'alice' };
        
        print Dumper $myvar ;
        
        $myvar->{id} = ($myvar->{otherid}) ? 'stringA' : 'stringB';
        
        print Dumper $myvar ;
        
        delete $myvar->{otherid};
        
        $myvar->{id} = ($myvar->{otherid}) ? 'stringA' : 'stringB';
        
        print Dumper $myvar ;
which generates

$VAR1 = {
          'otherid' => 'bob',
          'id' => 'alice'
        };
$VAR1 = {
          'otherid' => 'bob',
          'id' => 'stringA'
        };
$VAR1 = {
          'id' => 'stringB'
        };
ciao
drieux
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