From: Yusuke ENDOH <mame@...>
Date: 2011-04-10T12:28:57+09:00
Subject: [ruby-core:35682] Re: [Ruby 1.9 - Feature #4539][Assigned] Array#zip_with

Hi,

2011/4/9 Yukihiro Matsumoto <matz@ruby-lang.org>:
> I am not sure whether adding new zip_with or adding zip with symbol at
> last would be better. �Any opinion?

I'm neutral for adding zip with symbol at last, but I
object to letting zip with block return a new array.


2011/4/5 Benoit Daloze <eregontp@gmail.com>:
> An unconditional nil is anyway not useful here, the only concern I see
> might be the cost of creating this Array.

It is actually a problem.
I have used Array#zip with block for iteration many times.

  big_ary1.zip(big_ary2) do |x, y|
    p [x, y]
  end

The change requires some people (including me) to *rewrite*
such a code as follows:

  big_ary1.size.times do |i|
    x, y = big_ary1[i], big_ary2[i]
    ...
  end

So I like zip_with, if it is really needed.

-- 
Yusuke Endoh <mame@tsg.ne.jp>