From: "Peña, Botp" <botp@...>
Date: 2003-07-09T18:55:30+09:00
Subject: Re: Array.each


Brian Candler [mailto:B.Candler@pobox.com] wrote:

>   # what follows are just testing
>   x = '(1..8).to_a.each_group {|x,y,z| p "x = #{x};  y = 
> #{y.inspect};   z =
>   #{z.inspect}"}'
> 
> Why did you include "to_a"? Enumerable works on iterators 
> without having to convert them to an explicit array first. 
> For example, you could have a file with a million lines and 
> process it three lines at a time using

lol :-))
pls forgive me. As a nuby, I thought (1..8) was _just_ a range, so I
converted it to array first. I'm still thinking/seeing things narrowly.
Thank you for pointing me to enumerables & iterators.
 
>   File.open("/name/of/file").each_group {|l1,l2,l3| puts 
> "<#{l1}:#{l2}>#{l3}"}
> 
> If you did "to_a" it would have to read in the whole file 
> into RAM first.

very good point and very helpful indeed.
 
> Regards,
> 
> Brian.

kind regards -botp

>