[ruby-talk:5653] Re: Array#insert

In message "[ruby-talk:5652] Array#insert"
    on 00/10/18, Aleksi Niemel<[e-mail]> writes:
>I was looking up how Array#insert should be called. Uh, there's none! Maybe
>there's some other suitable method somewhere in the middle of the other, but
>I didn't spot it fast.
>
>Of course ary[index,0] = stuff. But it's very annoying format, when you
>could be more explicit too. Besides there's always the surprise of
>
>  ruby -e'a=[1,2,3]; a[1,0]=[4,5]; p a;'
>  [1, 4, 5, 2, 3]
>  ruby -e'a=[1,2,3]; a[1,0]=[[4,5]]; p a;'
>  [1, [4, 5], 2, 3]
>
>lurking, and I'd expect the first example output what the second does.

How about this?

  class Array
    def insert(pos, *obj)
      self[pos,0] = obj
      self
    end
  end

  a = [1,2,3] ; a.insert(1, [4, 5]) ; p a #=> [1, [4, 5], 2, 3]
  a = [1,2,3] ; a.insert(1,  4, 5 ) ; p a #=> [1, 4, 5, 2, 3]

-- gotoken