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Re^2: File::Find and $_ in the wanted sub

by rastoboy (Monk)
on Jun 04, 2010 at 20:28 UTC ( [id://843205]=note: print w/replies, xml ) Need Help??


in reply to Re: File::Find and $_ in the wanted sub
in thread File::Find and $_ in the wanted sub

So... $_ here is essentially a global variable the sub is accessing?

Replies are listed 'Best First'.
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
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 $_;
    or
    local $_ = 'temporary value';
    which makes a copy of your value; or, as ikegami wrote in another reply, using for/foreach:
    foreach('temporary value') { # your code }
    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).

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