From: Wybo Dekker <wybo@...>
Date: 2009-12-10T18:50:09+09:00
Subject: Re: which is better?

Robert Klemme wrote:

> And then there's also
> 
> irb(main):001:0> "123ab".tr "0-9", ""
> => "ab"
> irb(main):002:0> "123ab".tr! "0-9", ""
> => "ab"

But why no parentheses?:
irb
 >> $-w=true
=> true
 >> "abcd1234".gsub! /\d+/,''
(irb):13: warning: ambiguous first argument; put parentheses or even spaces
=> "abcd"
 >> "123ab".tr! "0-9",""
=> "ab"

what is the ambiguity in the first case, and why is there no warning in the 
second case?

-- 
Wybo