Re: What Is Going On Here ?????

This is why subroutines that use $_ should always begin with local $_;:

    sub do_something {
      local $_;
      ...
    }
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will fix the problem.

Comment on Re: What Is Going On Here ????? Download Code

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(tye)Re: What Is Going On Here ????? by tye (Sage) on Nov 21, 2000 at 22:35 UTC
I just wanted to emphasize that this is a really important point that will save you from the kinds of bugs that can take forever to track down. With modern Perls, you can skip the `local $_` if you only ever use `$_` as a loop variable, but better to be safe if you aren't sure. Update: Note that this doesn't apply to `while` loops (which don't have a loop variable in my book) as nicely pointed out by autark in Re: What Is Going On Here ?????. - tye (but my friends call me "Tye")	[reply] [d/l] [select]

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(tye)Re: What Is Going On Here ?????
by tye (Sage) on Nov 21, 2000 at 22:35 UTC

I just wanted to emphasize that this is a really important point that will save you from the kinds of bugs that can take forever to track down.

With modern Perls, you can skip the local $_ if you only ever use $_ as a loop variable, but better to be safe if you aren't sure.

Update: Note that this doesn't apply to while loops (which don't have a loop variable in my book) as nicely pointed out by autark in Re: What Is Going On Here ?????.

tye

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