From: "David A. Black" <dblack@...>
Date: 2008-06-04T03:27:39+09:00
Subject: Re: Beginner help

Hi --

On Wed, 4 Jun 2008, Justin To wrote:

> Hello, I have just started learning Ruby and have already come upon a
> problem:
>
> i'm learning and blocks and procs:
>
> def meth(proc)
>  puts "before proc"
>  proc.call
>  puts "after proc"
>
>  yield("hi")
>
>  if block_given?

If there's no block, that yield is going to have caused an exception
anyway.

>    puts "block exists"
>    else puts "D.N.E."
>      end
> end
>
> meth proc {|var1|  puts "block" }
>
> prc = lambda do
>  puts "inside proc"
> end
>
> meth(prc)
>
> the main thing i don't understand is how to create a block when the
> original method has an argument? and the block takes an argument....
>
> def meth(proc)
>
> meth proc {|var1|  puts "block" }

   meth(proc) {|var1| puts "block" }

Is that what you mean?


David

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