lambda與proc的區別

在一個方法中，lambda被call之後會返回都方法本身，而proc被call之後就會直接返回

def batman_ironman_proc
  victor = Proc.new { return "Batman will win!" }
  victor.call
  "Iron Man will win!"
end

puts batman_ironman_proc

def batman_ironman_lambda
  victor = lambda { return "Batman will win!" }
  victor.call
  "Iron Man will win!"
end

puts batman_ironman_lambda

運行的結果是

Batman will win!

Iron Man will win! 

==> nil