From: Phlip <phlip2005@...>
Date: 2008-05-25T06:07:11+09:00
Subject: Re: lambda, ->, haskell, and so on

Tammo Tjarks wrote:

> a.cond_each [{|a| a%2==0}, { 'even'},{|c| "it is #{c}"}]

> would be something like that possible for the parser? Is that a already an 
> existing idea or maybe even somewhere implemented?

I suspect I just did that to enable multiple arguments for assert_yin_yang.

First, get 'lambda' out of the way:

   def _(&block); lambda(&block);  end

Then, pass an arbitrary number of blocks and non-blocks in:

     q = 41
     assert_yin_yang _{ q +=  0 }, 'it broke!',
                     _{ q == 42 }

Inside the method, partition them into callables & diagnostic strings:

   def assert_yin_yang(*args)
     procks, diagnostic = args.partition{|p| p.respond_to? :call }

Then, iterate an array of procks, calling each one!

Is the new lambdoid operator going to replace my (dangerous) _ hack?

-- 
   Phlip