From: aidy <aidy.lewis@...>
Date: 2008-04-02T21:15:04+09:00
Subject: Re: boolean and logging

On 1 Apr, 14:23, Robert Klemme <shortcut...@googlemail.com> wrote:
> 2008/4/1,aidy<aidy.le...@googlemail.com>:
>
> > On 31 Mar, 16:56, Robert Klemme <shortcut...@googlemail.com> wrote:
>
> >  > The method invokes the block and uses the result to determine what to
> >  > do (if or else).
>
> >  > Does that help?
>
> >  Surely does. Thanks Robert, your a linguist.
>
> Hm, not sure whether that was irony or not. :-)
>
> Maybe this helps:
>
> irb(main):001:0> def test(yes,no)
> irb(main):002:1> if yield
> irb(main):003:2> puts yes
> irb(main):004:2> else
> irb(main):005:2* puts no
> irb(main):006:2> end
> irb(main):007:1> end
> => nil
> irb(main):008:0> test("ok", "not ok") { 1 > 2 }
> not ok
> => nil
> irb(main):009:0> test("ok", "not ok") { 1 < 2 }
> ok
> => nil
> irb(main):010:0> test("ok", "not ok")
> LocalJumpError: no block given
>         from (irb):2:in `test'
>         from (irb):10
>         from :0
> irb(main):011:0>
>
> Kind regards
>
> robert
>
> --
> use.inject do |as, often| as.you_can - without end

Wasn't ironic Robert, I studied #yield and blocks when you mentioned
them. It was exactly what I was looking for. Probably one of the most
powerful assets of Ruby and I missed it.

Cheers

Aidy