From: Frederick Cheung <frederick.cheung@...>
Date: 2008-07-16T00:50:05+09:00
Subject: Re: Array.drop doesn't work


On 15 Jul 2008, at 16:46, Li Chen wrote:

> Hi all,
>
> I try to use #drop to remove several elements from an array but it
> doesn't work.
> I check "ri Array.drop" and get no info about #drop. But I see this  
> info
> described in http://www.ruby-doc.org/core/classes/Array.html#M000343
>
>
> ary.drop(n) => array
>
> Drops first n elements from ary, and returns rest elements in an  
> array.
>
>   a = [1, 2, 3, 4, 5, 0]
>   a.drop(3)             # => [4, 5, 0]
>
>
>
Seems like this was added in 1.8.7 (if you look at the docs for 1.8.6  
you'll see it's not there)

Fred


> I wonder what is going on.
>
> Thank you very much,
>
> Li
> #########
> C:\Documents and Settings\chen73>irb
> irb(main):001:0> a=[1,2,3,4]
> => [1, 2, 3, 4]
> irb(main):002:0> a.class
> => Array
> irb(main):003:0> a.drop(1)
> NoMethodError: undefined method `drop' for [1, 2, 3, 4]:Array
>        from (irb):3
> irb(main):004:0> a.drop(2)
> NoMethodError: undefined method `drop' for [1, 2, 3, 4]:Array
>        from (irb):4
> irb(main):005:0>
>
> #########
> C:\Documents and Settings\chen73>ri Array.drop
> Nothing known about Array.drop
> -- 
> Posted via http://www.ruby-forum.com/.
>