From: David Alan Black <dblack@...>
Date: 2001-11-29T23:16:25+09:00
Subject: [ruby-talk:26898] Re: short article draft for review

Hi --

A couple o' suggestions:

On Thu, 29 Nov 2001, Tobias Reif wrote:

> Iterators:
>
> for first in 1..2 do
>    for second in 1..3 do
>      puts first.to_s + '.' + second.to_s
>    end
> end

To me, that doesn't illustrate iterator power very dramatically or
clearly.  I guess it's iterating... but when I think of a Ruby
iterator, I think of a method that iterates over something and
"yield"s to a block.  Well, maybe that's what the range is
doing... but you're putting the focus on the "for" structure.

> Recursion, blocks as arguments:
>
> def upto limit,current=1,&block
>    yield current
>    if current < limit
>      upto limit,current+=1,&block
>    end
> end
>
> upto(2) do |integer|
>    puts 'line' + integer.to_s
> end

Yeah, like that :-)  My advice would be to include an example that
involves an interator (without recursion), and then, if you think it's
important, a recursion example.

One other thing: In method definitions, putting the arg list in parens
might be a good idea.  (Personally I dislike the non-paren look, but
here I'm thinking of people who might like it ultimately but might be
confused by it initially.)


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav