Yaya Functional Programming!

functional.rb

# originally an IRB session on [email protected]
func= lambda {|hash,key| hash[key]=Hash.new(&func)}
# => #<Proc:0x000001010621b8@(irb):1 (lambda)> 
h=Hash.new &func
# => {} 
h[:foo]
# => {} 
h[:foo][:bar][:baaz] = 'yay functional programming!'
# => "yay functional programming!" 
h.keys
# => [:foo] 
h[:foo][:bar]
# => {:baaz=>"yay functional programming!"}