From: Robert Klemme <bob.news@...>
Date: 2005-01-26T00:35:55+09:00
Subject: Re: Array#insert implementation


"Zuzzurro" <celhoquilabrioche@zuzzurro.it> schrieb im Newsbeitrag
news:1106665910.3709.5.camel@localhost.localdomain...
> 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?

>> a = %w{a b c d}
=> ["a", "b", "c", "d"]
>> a[2,0]=%w{1 2 3}
=> ["1", "2", "3"]
>> a
=> ["a", "b", "1", "2", "3", "c", "d"]

Kind regards

    robert