From: Kent Dahl <kentda@...>
Date: 2003-04-05T20:43:17+09:00
Subject: Re: Strangeness in Find.find

Brian Candler wrote:
> 
> I was just looking at lib/ruby/1.8/find.rb and I am stumped by the marked
> line:
> 
>   def find(*paths) # :yield: path
>     paths.collect!{|d| d.dup}       # << ?!
>     while file = paths.shift
>       ... etc
> 
> For each element of the 'paths' array, it is duplicating that entry, then
> collecting those duplicates into a new array, 

I do not think it makes a new array. It uses the same array object.
Notice the "!".

> and then immediately throwing
> away that array!

No. It reuses the array object created upon calling it, which probably
saves both space and time. As for why the dup-ing is necessary, I don't
know.

-- 
(\[ Kent Dahl ]/)_    _~_    __[ http://www.stud.ntnu.no/~kentda/ ]___/~
 ))\_student_/((  \__d L b__/  NTNU - graduate engineering - 5. year  )
( \__\_�|�_/__/ ) _)Industrial economics and technological management(
 \____/_�_\____/ (____engineering.discipline_=_Computer::Technology___)