From: "Bartosz Dziewoński" <matma.rex@...>
Date: 2011-10-06T01:41:32+09:00
Subject: Re: Local vs method vs instance (was: Operator Overloading)

2011/10/4 Adam Prescott <adam@aprescott.com>:
> 2011/10/4 Bartosz Dziewoński <matma.rex@gmail.com>
>
>> >> 5. Stabby Lambda variables
>> >
>> > What do you mean by this?
>>
>> Regular lambda: a = lambda{|x,y| x+y} - it cant have, for example,
>> default value for arguments.
>>
>
> ?
>
>>> l = lambda { |x, y=2| [x,y] }
> => #<Proc:0x8d383a0@(irb):1 (lambda)>
>
>>> l.call(1)
> => [1, 2]
>
>>> RUBY_VERSION
> => "1.9.2"
>
> As far as I know, ->{} is absolutely no different from lambda {}.
>

Huh, that's true, I didn't realize - it didn't work on 1.8.x. I though
it wouldn't work for example due to ambiguity with the |
method/operator:

  a = lambda{|x, y=x|2| x+y}

Interestingly, it works. (But probably not the way you would expect.)

-- Matma Rex