From: Simon Strandgaard <0bz63fz3m1qt3001@...>
Date: 2003-06-09T19:59:23+09:00
Subject: Re: [RCR] join block

On Mon, 09 Jun 2003 10:14:00 +0000, Martin DeMello wrote:

> Simon Strandgaard <0bz63fz3m1qt3001@sneakemail.com> wrote:
>> 
>> So far I cannot think of any cases where I need to "join-pairs into a
>> string". Can you show some more examples in order to convince me, that this
>> actualy is usable ?     :-)
> 
> "{" << [1,2,3,"a","b",5,"c"].join {|x,y| 
>    (x.type == y.type) ? "," : "} {" << "}"
> 
> #=> {1,2,3} {a,b} {5} {c}
> 
> words.join {|x,y| (x[-1] == ?.) ? "\n" : " "}

OK.. You win, I loose.


> As for the block working on individual elements, that's map's job.

cjoin = collect-join 
pjoin = pair-join

I still think 'cjoin' is much more often used in practice than 'pjoin'.
Everytime I debug or do CGI, I use 'cjoin'.
I have never been in a situation where 'pjoin' could be useful for me.

What is your thoughts on what is most often used ?

--
Simon Strandgaard