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Re^2: Choosing between multiple closures

by oakb (Scribe)
on Jun 12, 2014 at 08:00 UTC ( #1089664=note: print w/ replies, xml ) Need Help??


in reply to Re: Choosing between multiple closures
in thread Choosing between multiple closures

Thank you, Eily. I just made the change to my actual code, and VOILA! It works.

It makes perfect sense, too. My problem lay in not understanding the need to return the return — I guess having so many returns is counterintuitive to me.

UPDATE: In the groggy wee morning hours, I understated the number of returns involved... the fix is actually returning the returned return. Yup, that's three returns, folks. No wonder I couldn't get my brain around it before reading Eily's elucidating answer.

Even though I thanked Mark Jason Dominus in my OP, it was actually Chap. 2 of his book that originally led me astray, since it shows coderefs everywhere an anonymous subroutine is too large to include right in a dispatch table:

$dispatch_table = { CHDIR => \&change_dir, LOGFILE => \&open_log_file, VERBOSITY => \&set_verbosity, ... => ..., };
(Higher-Order Perl, p. 44)

Of course, Chap. 2 didn't contemplate returning iterators, which don't really make an appearance until Chap. 4, so this is not a condemnation of MJD or his excellent book — without which I wouldn't even be using iterators in the first place. No, the fault is completely mine for mixing concepts MJD didn't intend to combine at that point in the book. Mea culpa.


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