On 13.03.2010 00:14, csra...@bol.com.br wrote:
Although the end result should be the same, I wonder if for a collection of
items where there is a lot of duplicates the sequential nature of collecting
and then converting to a Set wouldn't be less performant than Mariano's
proposed method?
--
Cesar Rabak
In my experience, yes, it would.
The difference in practice is usually so small you wouldn't prefer one
over the other unless it show up in a profile of a time-critical method
though.
Cheers,
Henry
Few distinct:
[(1 to: 500000) collect: [:each | each odd] as: Set] timeToRun 1347
[|aSet |
aSet := Set new.
(1 to: 500000) do: [:each | aSet add: each odd] ] timeToRun 375
All distinct:
[(1 to: 500000) collect: [:each | each +1] as: Set] timeToRun 1350
[|aSet |
aSet := Set new: 500000.
(1 to: 500000) do: [:each | aSet add: each +1] ] timeToRun 1740
Em 10/03/2010 10:07, Nicolas Cellier< nicolas.cellier.aka.n...@gmail.com>
escreveu:
self collect: aBlock as: Set
2010/3/10 Mariano Martinez Peck :
Hi. I was needing something like the SQL select distinct, that doesn't take
into account repeated objects. I didn't found anything useful in Collection,
and thus, I have implemented this:
Collection>> collectDistinct: aBlock
collectDistinct: aBlock
"Evaluate aBlock with each of the receiver's elements as the argument.
Collect the resulting values into a Set, thus repeated objects will not
be present.
Answer the new collection."
| newSet |
newSet := self species new asSet.
self do: [:each | newSet add: (aBlock value: each)].
^ newSet
Is there a better way ? Do you think it make sense to put this in Pharo ?
Cheers
Mariano
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