and here's one with a better comment that includes examples
On Tue, Mar 11, 2014 at 12:19 PM, Eliot Miranda <eliot.mira...@gmail.com>wrote: > Hi Alexandre, > > IMO the isKindOf:, apart from being ugly, will hurt performance badly. > Why not apply aSortBlockOrSymbol to the first element and then choose the > block appropriately? e.g. > > aSortBlockOrSymbol isSymbol > ifTrue: > [(#(true false) includes: (self first perform: > aSortBlockOrSymbol) > ifTrue: > [[:a :b | (a perform: aSortBlockOrSymbol)]] > ifFalse: > [[:a :b | (a perform: aSortBlockOrSymbol) < (b > perform: aSortBlockOrSymbol)]]] > ... > > Nicer to read and faster, no? > > On Tue, Mar 11, 2014 at 8:17 AM, Alexandre Bergel <alexandre.ber...@me.com > > wrote: > >> hi Uko, >> >> For Roassal, we have a #sortedAs: defined on all collections >> >> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >> SequenceableCollection>>sortedAs: aSortBlockOrSymbol >> "Answer a SortedCollection whose elements are the elements of the >> receiver. The sort order is defined by the argument, aSortBlock." >> "Return a new collection. This method does not do a side effect" >> >> | aSortedCollection aSortBlock | >> aSortedCollection := SortedCollection new: self size. >> aSortBlock := >> aSortBlockOrSymbol isSymbol >> ifTrue: [ [:a :b | |t1 t2| >> t1 := (a perform: >> aSortBlockOrSymbol). >> t2 := (b perform: >> aSortBlockOrSymbol). >> ((t1 isKindOf: >> Boolean) and: [t2 isKindOf: Boolean]) >> ifTrue: [ >> t1 ] >> ifFalse: >> [ t1 < t2 ] ] ] >> ifFalse: [ >> (aSortBlockOrSymbol numArgs = 1) >> ifTrue: [ [ :v1 :v2 | >> (aSortBlockOrSymbol value: v1) < (aSortBlockOrSymbol value: v2) ] ] >> ifFalse: [ aSortBlockOrSymbol ] ]. >> aSortedCollection sortBlock: aSortBlock. >> aSortedCollection addAll: self. >> ^ aSortedCollection >> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >> >> You can use it for example: >> (1 to: 4) sortedAs: #odd >> => a SortedCollection(1 3 2 4) >> >> Collection withAllSubclasses sortedAs: #numberOfMethods >> => a SortedCollection(HashBag IdentityHashBag ...) >> >> This is really handy. It should be part of Pharo I believe. >> >> Cheers, >> Alexandre >> >> >> On Mar 11, 2014, at 5:19 AM, Yuriy Tymchuk <yuriy.tymc...@me.com> wrote: >> >> > Hi guys. >> > >> > This is a thing that I encounter quite often. >> > >> > Eg I have a collection of projects and I want to sort them by creation >> date. It would be nice to be able to do something like: >> > >> > projects sortByProp: #creationDate >> > >> > or by birth date of the author >> > >> > projects sortByProp: [ :proj | proj author birthDate ] >> > >> > Maybe I'm wrong, but as I've told already I encounter it quite often >> and writing something like >> > >> > projects sortBy: [ :prev :next | prev creationDate <= next creationDate >> ] >> > >> > is boring for me. >> > >> > Cheers. >> > Uko >> >> -- >> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: >> Alexandre Bergel http://www.bergel.eu >> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. >> >> >> >> >> > > > -- > best, > Eliot > -- best, Eliot
SequenceableCollection-sortedAs.st
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