[Q] Best way of doing ...

People:
I need a way for two collections of different size could be tested for all elements in both.

Example:

A  := #(a1 a2 a3).
B := #(b1 b2 b3 b4 b5).

Some similar to

with: otherCollection do: twoArgBlock
    "Evaluate twoArgBlock with corresponding elements from this collection
    and otherCollection."
    otherCollection size = self size

But for different size

Very thanks


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>>>>> "Edgar" == Edgar J De Cleene <[hidden email]> writes:

Edgar> People:
Edgar> I need a way for two collections of different size could be tested for all
Edgar> elements in both.

Edgar> Example:

Edgar> A  := #(a1 a2 a3).
Edgar> B := #(b1 b2 b3 b4 b5).

Edgar> Some similar to

Edgar> with: otherCollection do: twoArgBlock
Edgar>     "Evaluate twoArgBlock with corresponding elements from this collection
Edgar>     and otherCollection."
Edgar>     otherCollection size = self size

Edgar> But for different size

When they are different sizes, what do you want done with
mismatched elements?  Call the block anyway, passing nil for the
shorter list?  Or not call the block at all?

And depending on your choice, you should name the method clearly:

withOverlappingElementsOf:do:
with:ifAbsent:do:

the latter, you could call as:

   a with: b ifAbsent: nil do: [ ... ]

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Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
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On Tue, 05 May 2009 15:29:30 +0200, Edgar J. De Cleene wrote:

> People:
> I need a way for two collections of different size could be tested for  
> all elements in both.

A quick and dirty (a prototype) is, to put both into the same new  
IdentitySet (or set, depends on your #=) and then just compare sizes.

Then you also don't need to sort, the set (of both) will free you from  
sorting. And #copyWithoutAll: can then give you things in B which are not  
in A, etc.

HTH.

--
"If at first, the idea is not absurd, then there is no hope for it".  
Albert Einstein

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