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laziness, impatience, and hubris

Re: poll ideas quest 2009

by irah (Pilgrim)
on Jun 15, 2009 at 10:04 UTC ( #771605=note: print w/replies, xml ) Need Help??

in reply to poll ideas quest 2009

What Quips you like most in Perl-monks?

  • Welcome to the Monastery
  • XP is just number.
  • P is for Practical.
  • Perl Monk, Perl Meditation.
  • Just another Perl shrine.
  • No such thing as a small change.
  • Think about Loose Coupling.
  • "be consistent."
  • Keep It Simple, Stupid.
  • Pathologically Eclectic Rubbish Lister.
  • Perl Sensitive Sunglasses.
  • Syntactic Confectionary Delight.
  • Go ahead... be a heretic.
  • There's more than one way to do things.
  • Perl: the Markov chain saw
  • laziness, impatience, and hubris
  • Your skill will accomplish what the force of many cannot.
  • good chemistry is complicated, and a little bit messy-LW
  • Others.

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[Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense
[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.
[Eily]: the overload version wouldn't return true with "$x" && !length $x though, I guess
[hippo]: The more I look at this code, the more $x is a plain old scalar and the more this condition will never be true. I'm calling it a bug at this point.
[hippo]: Thanks for your input which has soothed my sanity (a little)
[Corion]: Eily: Sure - if you force both things into stringy things, then you break that magic. But that would also mean that you changed the expression, as now $x = 0.00 will be true instead of false as it were before

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