From: Zuzzurro <celhoquilabrioche@...>
Date: 2005-01-26T00:15:56+09:00
Subject: Array#insert implementation

Hi,

I need an insert method for the Array class, the insert method let you
do something like this:

a = ['a', 'b', 'd']
a.insert!(2, 'C')

a => ['a', 'b', 'C', 'd']


I've implemented it this way:

class Array
  def insert(v, i)
    i = 0 if i < 0
    a = Array.new
    a += self[0..i-1] if i > 0
    a << v
    tail = self[i..-1] if i < self.length
    a += tail unless tail.nil?
    return a
  end

  def insert!(v, i)
    new_self = insert(v, i)
    clear
    concat new_self
  end
end


Is there a better way of doing this?