From: Robert Klemme <shortcutter@...>
Date: 2007-05-31T17:55:27+09:00
Subject: Re: Underscore

On 30.05.2007 22:36, Robert Dober wrote:
> On 5/30/07, Logan Capaldo <logancapaldo@gmail.com> wrote:
>> On 5/30/07, Robert Dober <robert.dober@gmail.com> wrote:
>> >
>> > On 5/30/07, Brian Candler <B.Candler@pobox.com> wrote:
>> > > On Wed, May 30, 2007 at 07:50:05AM +0900, Logan Capaldo wrote:
>> > > > On 5/29/07, Robert Klemme <shortcutter@googlemail.com> wrote:
>> > > > >
>> > > > >
>> > > > >I was too fast (again).  Even though the return value is used, I'd
>> > rather
>> > > > >do
>> > > > >
>> > > > >n.times { x = yield x }
>> > > > >
>> > > > >than using #inject which does more than needed in this case.  :-)
>> > > > >
>> > > > >Now, did I look at all aspects...?
>> > > >
>> > > >
>> > > > Almost.
>> > > > you'd actually need
>> > > > n.times { x = yield x }
>> > > > x
>> > >
>> > > Almost almost :-)
>> > >
>> > > x = nil
>> > > n.times { x = yield x }
>> > > x
>> > >
>> > >
>> > Robert was very quick indeed, he did not repeat the context of the
>> > expression which was
>> >
>> > def forgot_the_name(x,...)
>> >     n.times{ x = yield x }
>>
>>
>>       Still need x here
>>
>> end
>> >
>> > Now it works ;)
>>
>>
>> No it doesn't ;)  n.times {  ... } returns n.
> Obviously I am too stupid to test, sorry, I did test it, who knows how ;)
> Seriously I do know now, n just was the expected result of the block :(
> 
> def anyhow(count, x)
>  count.times{x=yield x}
>  x
> end
> 
> Maybe we can still agree that this is better than inspect ;)
> And yes thanks for the Ruby classes I got.

Hm...  Thinking a bit more about this I am not sure I'd stick with my 
proposal.  I think I'd probably do

irb(main):001:0> require 'enumerator'
=> true
irb(main):002:0> def rep(n,init=nil) n.to_enum(:times).inject(init) 
{|x,| yield x} end
=> nil
irb(main):003:0> rep(5,"x") {|s| puts s; s<<"."}
x
x.
x..
x...
x....
=> "x....."

Hmm...

Kind regards

	robert