Re: File::Find and $_ in the wanted sub

If you want something in $_, put it in $_.

#!/usr/bin/perl

testy() for 'i am a nice parameter';

sub testy {
   print "$_\n";
}
[download]

I used for to assign in order to $_ to protect the previous value of $_. Clobbering your caller's $_ is a bad idea.

Comment on Re: File::Find and $_ in the wanted sub Select or Download Code

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Re^2: File::Find and $_ in the wanted sub by rastoboy (Monk) on Jun 04, 2010 at 20:28 UTC
So... $_ here is essentially a global variable the sub is accessing?	[reply]
Re^3: File::Find and $_ in the wanted sub by ikegami (Patriarch) on Jun 04, 2010 at 21:48 UTC
yes, $_ is a global variable	[reply]
Re^3: File::Find and $_ in the wanted sub by bart (Canon) on Jun 06, 2010 at 13:03 UTC
Yes, you're accessing the same `$_` everywhere. So, by definition, it's a global. Only, it temporarily gets a new value before the call to your sub, and it gets restored to its old value afterwards. One way to that yourself is by using `local $_;` [download] or `local $_ = 'temporary value';` [download] which makes a copy of your value; or, as ikegami wrote in another reply, using for/foreach: `foreach('temporary value') { # your code }` [download] which will loop exactly once, with `$_` set to an alias of the value (meaning it's a different name for the same value, change the variable and the value will follow (or, for a constant, it might protest against the attempt to change a read-only value).	[reply] [d/l] [select]


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