cognitect-labs / transducers-ruby Goto Github PK

I've implemented a few custom transducing functions using this library (and your excellent JavaScript port).

After following the documentation here: http://www.rubydoc.info/gems/transducers/Transducers

Is their an idiomatic way of passing in additional parameters to transducing functions? E.g. perhaps if you're operating on an array of hashes, you could supply the hash key that the transducing function would use.

That said, I may be missing some fundamental concepts of how transducers are designed to work (and I have not used them in Clojure yet).

Not to be a Debby Downer, but this doesn't feel at all like idiomatic Ruby.

I think the biggest improvement would be to mix in a transduce method into Enumerable, with a signature closer to Enumerable#reduce. The other thing that feels wrong is that almost everything is a class method. It seems like a more idiomatic way to do it would be with a block using instance_eval, so we could do something like:

(1..100).transduce([], :<<) do
  filter(:even?)
  map{ |n| n * 2 }
  take(5)
end

For composabilitiy:

first_5_even_doubled = Transducer.compose do
  filter(:even?)
  map{ |n| n * 2 }
  take(5)
end

(1..100).transduce([], :<<) do
  first_5_even_doubled
end

I'll have to think about this some more, and see if I can contribute some code back to implement a more idiomatic way of doing this in Ruby, while keeping composability in mind.