Enumerabull pollutes Kernelspace with inverted versions of Enumerable's instance methods. It's like unleashing a bull in your Ruby shop to get "functional programming".

enumerabull.rb

module Kernel
  Enumerable.instance_methods.each do |meth|
    define_method(meth) do |*args|
      obj = args.pop
      case pred = args.first
      when Proc, Symbol
        obj.send meth, *args.drop(1), &pred
      else
        obj.send meth, *args
      end
    end
  end

  alias each each_entry
end

p reduce :+, 10, 1..10
p select :even?, 1..10
each->n { p n }, 1..10