map helper

gistfile1.rb

module BlockHelper
  def map_args(method_name)
    map(&method(method_name.to_sym))
  end

  def each_args(method_name)
    each(&method(method_name.to_sym))
  end
end

Array.send(:include, BlockHelper)
Hash.send(:include, BlockHelper)

def double(n); 2*n; end
[1, 2, 3].map_args(:double)
[2, 4, 6] 

[1, 2, 3].each_args(:puts)
1
2
3

def double_val((k, v)); 2*v; end => nil 
{'foo' => 42}.map_args(:double_val)
[84]