From: Andy Bogdanov <andy.bogdanov@...>
Date: 2010-06-29T06:32:33+09:00
Subject: Re: passing a block to yield

> There is no point in passing a block to yield

Maybe there always is a way to avoid using procs and lambdas, but i 
don't see other easy way in my case (see below).
Proc#call accepts blocks, why does yield not? It's almost the same 
thing.

> yield implicitly calls the block
> passed to the current method.

Thanks for the tip. Forgot that yield belongs to method context only.

> def each_child(&b)
>    b[self] # or b.call(self) or simply yield self
>    @children.each {|ch| ch.each_child(&b)}
>    self
> end

This code will just pass all the elements to a block, there's no way to 
wrap lower levels into <ul> tag. I need to control what happens before 
and after each_child so i have use a number of procs as arguments or do 
this trick with a block.
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