Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re: (elbie): Interpreting values alternately as $trings and Integers = confused response by Perl

by premchai21 (Curate)
on Apr 15, 2002 at 01:09 UTC ( #159058=note: print w/replies, xml ) Need Help??


in reply to (elbie): Interpreting values alternately as $trings and Integers = confused response by Perl
in thread Interpreting values alternately as $trings and Integers = confused response by Perl

I agree that the quotes should probably be removed, but for reasons of clarity -- that is, people are likely to glance at the code and accidentally interpret the == as an eq due to seeing quotes. == does "true numerical comparison" whether or not there are quotes there; the string gets converted to a number for the ==, and it DWYM.

  • Comment on Re: (elbie): Interpreting values alternately as $trings and Integers = confused response by Perl

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://159058]
help
Chatterbox?
[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.
[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

How do I use this? | Other CB clients
Other Users?
Others contemplating the Monastery: (14)
As of 2017-07-27 13:34 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    I came, I saw, I ...
























    Results (413 votes). Check out past polls.