Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

Re^2: A refactoring trap

by ihb (Deacon)
on Aug 23, 2005 at 21:47 UTC ( #486026=note: print w/ replies, xml ) Need Help??

in reply to Re: A refactoring trap
in thread A refactoring trap

Dispite that many has pointed out that

while (my $line = <DATA>) { ... } while (defined (my $line = <DATA>)) { ... }
are identical, your first remark is true. The problem lies elsewhere:
while (<DATA>) { ... }
doesn't localize $_ and thus leaves $_ undefined after the loop.
while (my $line = <DATA>) { ... }
doesn't suffer from this as it doesn't touch $_.

If put in a subroutine this innocent little bug cause a serious headache while trying to find out why $_ all of a sudden is undefined.


See perltoc if you don't know which perldoc to read!

Comment on Re^2: A refactoring trap
Select or Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://486026]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others cooling their heels in the Monastery: (3)
As of 2015-10-10 05:58 GMT
Find Nodes?
    Voting Booth?

    Does Humor Belong in Programming?

    Results (254 votes), past polls