Hue-Bond has asked for the wisdom of the Perl Monks concerning the following question:
Esteemed monks,
After playing with JSON::RPC::Client and obtaining the error "value is type str, expected real" (not sure if the error comes from client validation or from the server but that doesn't matter) I investigated and found that Data::Dumper was turning my floating point parameters into strings. I tried changing a couple of configuration variables listed in the module's documentation and was surprised to find that Useperl solves the problem:
use warnings; use strict; use Data::Dumper; use JSON; my $json = JSON->new; for my $up (0, 1) { print "useperl: $up\n"; $Data::Dumper::Useperl = $up; my $data = { foo => 'bar', qux => 0.42 }; printf "before: '%s'\n", $json->encode ($data); Dumper $data; #Data::Dumper->Dump ([$data], ['data']); printf "after: '%s'\n", $json->encode ($data); } __END__ useperl: 0 before: '{"qux":0.42,"foo":"bar"}' after: '{"qux":"0.42","foo":"bar"}' useperl: 1 before: '{"qux":0.42,"foo":"bar"}' after: '{"qux":0.42,"foo":"bar"}'
Both Dumper and Data::Dumper->Dump show this effect. When working with integers, we get more consistent results:
use JSON; my $json = JSON->new; for my $up (0, 1) { print "useperl: $up\n"; $Data::Dumper::Useperl = $up; my $data = { foo => 'bar', qux => 42 }; printf "before: '%s'\n", $json->encode ($data); Dumper $data; #Data::Dumper->Dump ([$data], ['data']); printf "after: '%s'\n", $json->encode ($data); } __END__ useperl: 0 before: '{"qux":42,"foo":"bar"}' after: '{"qux":42,"foo":"bar"}' useperl: 1 before: '{"qux":42,"foo":"bar"}' after: '{"qux":42,"foo":"bar"}'
Is this difference in behaviour to be expected?
--
David Serrano
(Please treat my english text just like Perl code, i.e. feel free to notify me of any syntax, grammar, style and/or spelling errors. Thank you!).
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Replies are listed 'Best First'. | |
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Re: Data::Dumper turns floating points numbers into strings
by ikegami (Patriarch) on Jun 14, 2011 at 17:16 UTC | |
Re: Data::Dumper turns floating points numbers into strings
by ig (Vicar) on Jun 14, 2011 at 18:43 UTC | |
Re: Data::Dumper turns floating points numbers into strings
by Hue-Bond (Priest) on Jun 14, 2011 at 22:41 UTC | |
Re: Data::Dumper turns floating points numbers into strings
by mje (Curate) on Jun 15, 2011 at 08:18 UTC |