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(tye)Re3: do/redo or for(;;): what's Kosher?

by tye (Sage)
on Jan 05, 2002 at 05:38 UTC ( #136450=note: print w/ replies, xml ) Need Help??

in reply to Re(3): do/redo or for(;;): what's Kosher?
in thread do/redo or for(;;): what's Kosher?

I'm pretty sure that the reason is:

{ # do loop stuff to be done at least once last if BREAK-CONDITION; # do middle loop stuff <<< This part was left out redo; }
which I'd still use while(1) for. Plus it allows you to do:
{ # read next line last if NoMoreLines # extract item from line redo if NoItemInLine last if EndOfItemListFound # categorize item redo if WrongItemCategory # check for updates redo if NoUpdatesThisCategory; # check permissions last if NoUpdatesAllowed; redo if ThisUpdateNotAllowed; # do update redo if NotFatal; # handle fatal error # (note, no "redo" here so this part isn't really # part of the "loop", just stuff to do once unless # "last" gets triggered above.) } # done with items
where it is very easy to throw in a new check or new code in. But, as I said elsewhere, I find that power to be too easy to abuse. YMMV.

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

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Re(tye 2): do/redo or for(;;): what's Kosher?
by dmmiller2k (Chaplain) on Jan 06, 2002 at 08:34 UTC

    Ah, in that context, I see where this approach could be useful.

    I think I agree with you, though, that the while (1) (with scattered nexts in place of redos) accomplishes the same thing in a more self-explanatory way.


    You can give a man a fish and feed him for a day ...
    Or, you can
    teach him to fish and feed him for a lifetime

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