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

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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

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