From: Yusuke ENDOH <mame@...>
Date: 2010-10-05T23:32:55+09:00
Subject: [ruby-core:32697] Re: [Ruby 1.9-Feature#3845][Open] "in" infix operator

Hi,

2010/9/29 Roger Pack <rogerdpack2@gmail.com>:
> I like it. �There's a kind of elegance in it
>
> if a in [1,2,3]
> � �p ' it is in 1,2,3'
> end
>
> It works well with my head. �+1


Thanks, but it is a bit different from my original suggestion.
My suggestion does not require brackets:

  if a in 1,2,3
    p 'it is in 1,2,3'
  end

a in [1,2,3] is slightly verbose (for me) and inefficient because
it creates new array object when evaluated.
If you want to write array there, you can use splat operator:

  ary = [1,2,3]
  if a in *ary
    p 'it is in ary'
  end

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