Module to print hash?
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From: Peng Yu on 6 Jun 2010 20:58 Whenever, I want to print a hash for inspection of its content. I could write the following while loop. But I feel this is a common task and probably should be factor out into a module. Could you please let me know if there is a well designed module that can print an arbitrarily complex hash? while (($key, $value) = each(%coins)){ print $key.", ".$value."\n"; }
From: Keith Keller on 6 Jun 2010 21:16 On 2010-06-07, Peng Yu <pengyu.ut(a)gmail.com> wrote: > Whenever, I want to print a hash for inspection of its content. I > could write the following while loop. But I feel this is a common task > and probably should be factor out into a module. Could you please let > me know if there is a well designed module that can print an > arbitrarily complex hash? Use the Data::Dumper module. I am not sure if the following still applies for your version of Perl, but read your Data::Dumper docs to be sure: BUGS Due to limitations of Perl subroutine call semantics, you cannot pass an array or hash. Prepend it with a "\" to pass its reference instead. This will be remedied in time, now that Perl has subroutine prototypes. For now, you need to use the extended usage form, and prepend the name with a "*" to output it as a hash or array. --keith -- kkeller-usenet(a)wombat.san-francisco.ca.us (try just my userid to email me) AOLSFAQ=http://www.therockgarden.ca/aolsfaq.txt see X- headers for PGP signature information
From: Peter J. Holzer on 7 Jun 2010 05:02 On 2010-06-07 01:16, Keith Keller <kkeller-usenet(a)wombat.san-francisco.ca.us> wrote: > BUGS > Due to limitations of Perl subroutine call semantics, you cannot > pass an array or hash. Prepend it with a "\" to pass its > reference instead. This will be remedied in time, now that Perl has > subroutine prototypes. Perl has had prototypes for 15 years now, so I think it's a safe bet that this "bug" will never be remedied. hp
From: Justin C on 7 Jun 2010 08:19 On 2010-06-07, Peng Yu <pengyu.ut(a)gmail.com> wrote: > Whenever, I want to print a hash for inspection of its content. I > could write the following while loop. But I feel this is a common task > and probably should be factor out into a module. Could you please let > me know if there is a well designed module that can print an > arbitrarily complex hash? > > while (($key, $value) = each(%coins)){ > print $key.", ".$value."\n"; > } Look for the module Data::Dumper. I believe that it's part of a standard install. Justin. -- Justin C, by the sea.
From: Charlton Wilbur on 7 Jun 2010 11:56
>>>>> "PY" == Peng Yu <pengyu.ut(a)gmail.com> writes: PY> Whenever, I want to print a hash for inspection of its PY> content. I could write the following while loop. But I feel this PY> is a common task and probably should be factor out into a PY> module. Could you please let me know if there is a well designed PY> module that can print an arbitrarily complex hash? You've been asking a lot of really fundamental questions. Do you have a copy of _Programming Perl_ within arm's length? If not, why not? Consulting that book *before* asking a question would probably save you the time it takes to wait for a response, and would probably save the people who read this newsgroup a lot of time. Further, people only have so much patience to expend on other people's questions. Would you rather get the help of the experts in this group on basic questions that you could look up in _Programming Perl_, or would you rather save their patience for when you have a *really* difficult question? Charlton -- Charlton Wilbur cwilbur(a)chromatico.net |