From: Jim Freeze <jim@...>
Date: 2002-12-17T08:52:44+09:00
Subject: How to return value from middle of a block?

Hi:

I am trying to return a value from a middle of a block,
but when I do, it exits the block.

Here is the code:

def _parse
  loop { puts yield }
end

def parse
  i = 0
  _parse { 
    # This code returns nil, but keeps going.
    # prints
    # 1
    # 2
    # nil
    # ...
    #i+=1 == 3 ? rtn = nil : rtn = i   
    #rtn

    # This code quits when it see return
    # prints 
    # 1
    # 2
    i += 1
    if i == 3
      return nil
    end
    i
  }
end

parse


Is there a syntax for returning a value from the middle of
a block? I know that I can always set a return value and
let execution drop to the bottom of the block, but it is
discomforting for there to be a difference betweeen
an implicit return and an explicit return.

-- 
Jim Freeze
----------
Hofstadter's Law:
	It always takes longer than you expect, even when you take
Hofstadter's Law into account.