Secondly, lambdas and procs have different behaviors when it comes to returning values from methods. To see this, I'm going to create a method called my_method:

def my_method 
  x = lambda  {return} 
  x.call 
  p "Text within the method" 
end 

my_method 

If I run this method, it prints out "Text within the method":

Now, let's try exactly the same implementation with a proc:

def my_method 
  x = Proc.new {return} 
  x.call 
  p "Text within the method" 
end 

my_method 

When you run it this time, it returns a value of nil.

What happened is that when the proc saw the return word, it exited out of the entire method and returned a nil value. However, in the case of the lambda, it processed the remaining part of the method.

So, these are the subtle and yet important differences between lambdas and procs.