Closure Example


def stack_closures
   stack = []
   push = lambda{|x| stack.push(x)}
   pop =  lambda{stack.pop}
   top =  lambda{stack[-1]}
   return push, pop, top
end

pusher, popper, topper = stack_closures()
pusher.call(10)
pusher.call(20)
popper.call	# => 20
topper.call	# => 10

Encapsulated local variables