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Re: creating tk buttons with for loop

by converter (Priest)
on Apr 09, 2004 at 03:11 UTC ( #343839=note: print w/ replies, xml ) Need Help??


in reply to creating tk buttons with for loop

From the Foreach section of the perlsyn POD:

Foreach Loops The "foreach" loop iterates over a normal list value and sets the variable VAR to be each element of the list in turn. If the variable is preceded with the keyword "my", then it is lexically scoped, and is therefore visible only within the loop. Otherwise, the variable is implicitly local to the loop and regains its former value upon exiting the loop. If the variable was previously declared with "my", it uses that variable instead of the global one, but it's still localized to the loop. This implicit localisation occurs only in a "foreach" loop.

The variable $open is local to the loop and regains its former value at the end of the loop. You're calling &view with a localized package variable that is uninitialized. Use a lexical iterator instead so that the anonymous subroutine definition keeps a reference to the $open that exists at the time of the definition. Change this:

foreach $open (@deleted) { .... }

to this:

foreach my $open (@deleted) { ... }


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