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Re^6: Parsing SOAP::Lite results

by Roboz (Novice)
on Sep 28, 2012 at 13:44 UTC ( #996224=note: print w/ replies, xml ) Need Help??


in reply to Re^5: Parsing SOAP::Lite results
in thread Parsing SOAP::Lite results

That worked great. I had tried some  if (ref($location_ref) eq 'ARRAY') {...} elsif (ref($location_ref) eq 'HASH') {...} and just changed the @$ to a %$ and was getting a 'Can't use string ... strict refs' error. Glad you returned with the better way to do it.

Can you tell me what's happening here?

my $location_array_ref = ref($location_ref) eq 'ARRAY' ? $location_ref : [ $location_ +ref ];

Thank you very much!


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Re^7: Parsing SOAP::Lite results
by kcott (Abbot) on Sep 28, 2012 at 15:13 UTC

    That's the Conditional Operator. You'll often see it referred to as the ternary operator (actually, that's what I usually call it). That single statement could be written as:

    my $location_array_ref; if (ref($location_ref) eq 'ARRAY') { $location_array_ref = $location_ref; } else { $location_array_ref = [ $location_ref ]; }

    There's an assumption here that if it's not an arrayref, it will be a hashref. That seemed like a reasonable assumption to me; especially for a short script intended to demonstrate a technique. Furthermore, trying to guess what other data types you might be working with would simply be other assumptions.

    The basic syntax for this operator is:

    expression1 ? expression2 : expression3

    There's nothing to say how complex any of those expressions might be; in fact, any of them could include another ternary operator.

    Putting all that together, here's an example of far more robust code that allows arrayrefs, hashrefs, scalarrefs and non-reference scalar values with anything else generating an error.

    foreach my $e (@{$getToysResults->{Toys}{Toy}}) { my $location_ref = $e->{ToyLocations}{ToyLocation}; my $ref_type = ref $location_ref; my $location_array_ref = $ref_type eq 'ARRAY' ? $location_ref : $ref_type eq 'HASH' ? [ $location_ref ] : $ref_type eq 'SCALAR' ? [ { locationName => $$location_ref } + ] : $ref_type eq '' ? [ { locationName => $location_ref } +] : undef; die 'Data corrupt' unless defined $location_array_ref; for my $location_array_hash_ref (@$location_array_ref) { print $location_array_hash_ref->{locationName}, "\n"; } }

    If you want to play around with this, here's the code I used for my tests and the output. Note that I changed die to warn to see all conditions being exercised in a single run.

    -- Ken

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