Re: PIZZA time again :-)
From: mAsterdam <mAsterdam_at_vrijdag.org>
Date: Sat, 03 Sep 2005 01:59:44 +0200
Message-ID: <4318e74c$0$11070$e4fe514c_at_news.xs4all.nl>
>
> Perhaps it should do the same thing as a sort on a set where no
> ordering has been defined - ?
>
> I'd like plenty of mozarella, olives (black or green), tomatoes, and
> maybe even some pepperoni on either a whole wheat crust or a thin crust
> -- oh, and pineapple too. The ordering does make a difference, as does
> the city in which I'm eating the pizza -- in Chicago I'm OK with
> reversing the order and adding sausage to the pizza. I'm sitting in
> the biggest pork producing county in the U.S. right now and people
> order pizza with "swine" on it here.
>
> I talked students through a pizza example from the Head Frist Design
> Patterns book last year -- a fun book for anyone wanting to teach or
> learn OO design patterns.
>
> cheers! --dawn
Date: Sat, 03 Sep 2005 01:59:44 +0200
Message-ID: <4318e74c$0$11070$e4fe514c_at_news.xs4all.nl>
dawn wrote:
> mAsterdam wrote:
>>dawn wrote: >>>mAsterdam wrote: >>>>>>Assume >>>>>>1. there is a meaningful (or at least consequential) >>>>>>difference between: >>>>>> >>>>>> toppings([salami, mozarella, onions]). >>>>>> and >>>>>> toppings([mozarella, onions, salami]).
[snip]
>>>>Consider >>>> >>>> merge(ListOfLists, MergedList). >>>> >>>>Now >>>> >>>>merge ([[salami, mozarella, onions][mozarella, onions, salami]], M). >>>> >>>>should fail because salami is before mozarella in the first list, >>>>and after it in the second. It can't preserve the order. >>> >>>I don't know how you define a merge when there isn't >>>an ordering defined on the type. >>>Is there such a function? Your lists are ordered here, >>>but your domain/type is not, unless you choose something >>>like alpha order. >> >>That is another way of asking the same question. >>What should 'merge' do when the order is not >>in the values (as it would be if we took the >>ordering defined on the type) but just in >>their position, relative to other values. >>It is what I'm trying to find out.
>
> Perhaps it should do the same thing as a sort on a set where no
> ordering has been defined - ?
Which would be - in the context of lists? Could you please (try to) translate what you mean onto the realm of lists?
>>>I can imagine an interleave function that alternates ingredients from >>>both lists and yields a pizza with salami on it twice (I think I'll >>>pass on it, however). --dawn >> >>So that is not the desired behaviour. >>The resulting pizza will be richer than the >>originals, but I would like to see one you >>would like to eat.
>
> I'd like plenty of mozarella, olives (black or green), tomatoes, and
> maybe even some pepperoni on either a whole wheat crust or a thin crust
> -- oh, and pineapple too. The ordering does make a difference, as does
> the city in which I'm eating the pizza -- in Chicago I'm OK with
> reversing the order and adding sausage to the pizza. I'm sitting in
> the biggest pork producing county in the U.S. right now and people
> order pizza with "swine" on it here.
>
> I talked students through a pizza example from the Head Frist Design
> Patterns book last year -- a fun book for anyone wanting to teach or
> learn OO design patterns.
>
> cheers! --dawn
You already know you are welcome to enjoy the best pizzas in Amsterdam whenever you feel like coming here :-) Received on Sat Sep 03 2005 - 01:59:44 CEST