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Re: Re: Re: "Correct" program style questions

by Anonymous Monk
on Oct 23, 2002 at 19:08 UTC ( #207497=note: print w/ replies, xml ) Need Help??

in reply to Re: Re: "Correct" program style questions
in thread "Correct" program style questions

it's worse than obfustication, it's out right betrayal worthy of the machiavellian-est of perl programers. if param('color') returns a false value (be it undef or the empty string) the regex against '' is going to always return undef.

I assume you simply want to provide a default value for $color if a) it's not present (param('color') returns empty string or undef) or b) it isn't a sequence of only [:alpha:] chars.

use locale; my $color = param('color') =~ /^\w+$/ ? param('color') : "default color";
or you could write it as:
my $color = "default color"; $color = param('color') if param('color') =~ /^\w+$/;

of course, the real solution to this is:

use locale; sub is_alpha { my ($datum) = @_; # return "" so we don't get unitialized value errors $datum =~ /^(?:\w+)$/ ? $datum : ""; } my $color = is_alpha(param('color')) || "default value";

Or why not sub class CGI and add these checks to CGI::param? Have MyCGI::param return an object with color, name, etc methods so you could just write $cgi->param->color;

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