After asking #ruby what the equivalent of Clojure’s -> macro could look like, I compiled the collective solution into a gist. You might find this useful somewhere, especially when you have multiple transformation functions operating on the same basic data structures.

# piping example in Ruby

def foo(data)
  data[:a] += 1
  data
end

def bar(data)
  data[:b] += 10
  data
end

def pipe args, *methods
 methods.reduce(args) { |a, m| send(m, a) }
end

hash = {:a => 0, :b => 0}
pipe hash, :foo, :bar
#=> {:a=>1, :b=>10}