in reply to Question regarding variable scope


When you declare my $black_player at the start of the sub .That variable is global through the scope of the sub .
(My or our would behave the same with respect to this sub,behaviour would vary with respect to code followinng down the line).
When you do a foreach $black_player (@possible_opponents)
This effectively overrides the above $black_player .It is local to the loop.Same principle as a pass by value in C.
Therefore ,you can rename your looping variable or just do what roger has done ,use $_.

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Re: Re: Question regarding variable scope
by MarkM (Curate) on Oct 17, 2003 at 05:33 UTC

    Actually, my() and our() do not behave the same from a subroutine. Both define a lexical context for the variable, however, my() allocates a new variable each time it is evaluated, while our() reuses a global.

    For recursive subroutines, or subroutines that are accessed at the same time from multiple threads, my() variables are safe, while our() variables are unsafe.

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