Extending Array with Parallel gem

parallel_array.rb

class Array
  %w(each map each_with_index map_with_index flat_map any? all?).each { |meth|
    define_method("#{meth}_in_parallel") { |&block|
      Parallel.send(meth, self) { |item| block.call(item) }
    }
  }
}

Now we can call [1,2,3].each_in_parallel { |i| puts i }