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Re: using 'my'

by mr_mischief (Monsignor)
on Jun 21, 2001 at 19:01 UTC ( #90390=note: print w/replies, xml ) Need Help??


in reply to using 'my'

Is it necessary to wear safety restraints when driving a car or operating machinery? I mean, if you don't plan on getting in an accident, then who needs safety equipment, right?

What happens, though, when you are diving perfectly safely, then someone comes along and runs a light, smashing into you? Now is when you _need_ the safety belt. The problem is, it's too late to put it on.

So, what happens when you write a perfect 10,000 line program without scoping? It's a perfect program. What happens in six months when you need to help track down a typo someone else made in the code and you don't quite recall what each of those 10,000 lines does (because you've worked on two new major projects and four major maintenance projects in the meantime, as well as daily tweaks and bug hunts)? Now is when you _need_ scoping...

Chris

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[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
[Corion]: Ah no, at least in my feeble experiments that doesn't change the meaning
[Corion]: We sell sanity in small packages ;)

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