From: Sam Roberts <sroberts@...>
Date: 2003-02-13T13:52:49+09:00
Subject: Re: Why does Array#compact! return the array, but uniq! return a count?

Ah. I misread the compact! docs, and thought it was different.

Now I understand.

Thanks!

Sam

Quoteing matz@ruby-lang.org, on Thu, Feb 13, 2003 at 01:41:17PM +0900:
> Hi,
> 
> In message "Why does Array#compact! return the array, but uniq! return a count?"
>     on 03/02/13, Sam Roberts <sroberts@uniserve.com> writes:
> 
> |I wanted to remove all nils and duplicate values from an array:
> |
> |  ...
> |  @fields.collect{ |field| field.group }.compact!.uniq!
> |end
> |
> |I wanted to modify in place, because the return value of collect() is
> |ephemeral, nobody else can have a reference, no need to duplicate it, I
> |thought...
> |
> |But now I have:
> |
> |  all = @fields.collect{ |field| field.group }.compact!
> |  all.uniq!
> |  all
> |end
> 
> Array's bang methods return nil if it does not modify the receiver, so
> that chaining is not encouraged.
> 
> 							matz.
>