Turn on warnings and you'll probably realize that trailing commas are silently ignored and that => is a "fat comma".

With warnings, your last example complains "Odd number of elements in hash assignment" and doesn't do what you thought.

It is a "bug" that map is too slow when more than one item is output per input item. This bug will be fixed when perl 5.6.1 or perl 5.8 becomes available.

        - tye (but my friends call me "Tye")

In reply to (tye)Re: map efficiency by tye
in thread map efficiency by snowcrash

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