Hi all Streams are lazily evaluated lists. I have been inspired by James' excellent blog about infinite streams, and the functional interface of Scheme towards their usage. But just in order to keep this short I have put all the links to the release, documentation and other sources on the Labrador Rubyforge Homepage. http://labrador.rubyforge.org/index.html Enjoy. Robert
on 2009-01-17 00:07
on 2009-01-19 10:05
Robert Dober wrote: > Streams are lazily evaluated lists. Aside: it is also possible to make use of infinite enumerators in Ruby (i.e. a traditional 'each' method which yields an infinite number of values), and this may be sufficient in some applications. In order for this to be useful, you need to process chains of methods acting 'horizontally' instead of 'vertically'. The block form of Enumerator lets this be done natively in ruby 1.9: http://redmine.ruby-lang.org/issues/show/707 and with a little work, this can be made entirely transparent to map, select etc: http://redmine.ruby-lang.org/issues/show/708 It turns out to be very easy to implement the block form of Enumerator in ruby 1.8. I contributed an implementation of this to the Facets project: http://facets.rubyforge.org/git?p=facets.git;a=blo... http://facets.rubyforge.org/git?p=facets.git;a=blo... Anyway, I just thought this was worth a mention. It's not as powerful as full lazy evaluation, although if you combine this with Generators I think it gets pretty close. Regards, Brian.