Hi,
I get a ReadStream from some part of a program which is created this way
stream := (ReadStream on: #( #(#a #b) #(#b #c)))
I like to use collect: on that stream:
stream collect: [:each| 'k',each first]
Is there a possibility to specify the resulting collection produced by collect. The problem here is the species call with an add: call afterwards which is not appropriate (the debugger said :) )
thanks,
Norbert
Hi Norbert,
Streams don't support the collection protocols. You can convert a stream to a collection by sending #contents to the stream:
stream := (ReadStream on: #( #(#a #b) #(#b #c))). stream contents collect: [:each| 'k',each first] --> #('ka' 'kb')
Is that what you want?
Cheers, Oscar
On Oct 30, 2007, at 2:00, Norbert Hartl wrote:
Hi,
I get a ReadStream from some part of a program which is created this way
stream := (ReadStream on: #( #(#a #b) #(#b #c)))
I like to use collect: on that stream:
stream collect: [:each| 'k',each first]
Is there a possibility to specify the resulting collection produced by collect. The problem here is the species call with an add: call afterwards which is not appropriate (the debugger said :) )
thanks,
Norbert
Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
On Tue, 2007-10-30 at 08:03 +0100, Oscar Nierstrasz wrote:
Hi Norbert,
Streams don't support the collection protocols. You can convert a stream to a collection by sending #contents to the stream:
stream := (ReadStream on: #( #(#a #b) #(#b #c))). stream contents collect: [:each| 'k',each first] --> #('ka' 'kb')
Is that what you want?
Sure, it works :) What I do not understand is that a lot of the collection protocol is in ReadStream. It has detect: select: collect: includes: ... What is it for?
thanks,
Norbert
Strange. I do not see these methods supported by ReadStream in my image.
I only see 13 implementors of #collect:
What does your implementation of ReadStream>>collect: say?
Oscar
On Oct 30, 2007, at 8:20, Norbert Hartl wrote:
On Tue, 2007-10-30 at 08:03 +0100, Oscar Nierstrasz wrote:
Hi Norbert,
Streams don't support the collection protocols. You can convert a stream to a collection by sending #contents to the stream:
stream := (ReadStream on: #( #(#a #b) #(#b #c))). stream contents collect: [:each| 'k',each first] --> #('ka' 'kb')
Is that what you want?
Sure, it works :) What I do not understand is that a lot of the collection protocol is in ReadStream. It has detect: select: collect: includes: ... What is it for?
thanks,
Norbert
Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
On Tue, 2007-10-30 at 08:27 +0100, Oscar Nierstrasz wrote:
Strange. I do not see these methods supported by ReadStream in my image.
I only see 13 implementors of #collect:
What does your implementation of ReadStream>>collect: say?
Oh, I'm sorry. The methods in ReadStream are added by Glorp. So I take another list for asking :)
FYI the implementation is
ReadStream>>collect: aBlock | newStream | newStream := AddingWriteStream on: collection species new. [self atEnd] whileFalse: [newStream nextPut: (aBlock value: self next)]. ^newStream contents
Norbert
beginners@lists.squeakfoundation.org
-
Norbert Hartl -
Oscar Nierstrasz