From: Brian Candler <B.Candler@...>
Date: 2003-07-09T18:42:35+09:00
Subject: Re: Array.each

On Wed, Jul 09, 2003 at 05:56:38PM +0900, "Pe�a, Botp" wrote:
> but why not use #arity for block's param count, no?

That's cool, and I hadn't thought of doing it that way. I still don't trust
"yield" semantics; i.e. the implicit conversion of multiple arguments to an
array or vice versa. I'd be much happier if you had to do
           { |*i| ... }
if you wanted multiple arguments amalgamated into an array.

One other point:

  # 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

  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.

Regards,

Brian.