From: Andrew Wagner <wagner.andrew@...>
Date: 2010-09-14T23:56:53+09:00
Subject: Re: method! and method?

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This blog post<http://dablog.rubypal.com/2007/8/15/bang-methods-or-danger-will-rubyist>has
an interesting perspective on the topic.

On Tue, Sep 14, 2010 at 10:44 AM, Brian Candler <b.candler@pobox.com> wrote:

> Gene Angelo wrote:
> > I am trying to find the meaning of ! and ? appended to method names but
> > I cannot find what they mean. Can someone explain?
>
> They don't mean anything - they are just part of the name. That is, in
>
>  str.downcase!
>
> the method you are calling is called :downcase! - which is a distinct
> method to :downcase
>
> However, there are conventions as to when they should be used. Methods
> ending ? typically query the properties of some object and return a
> boolean-like result, while methods ending ! are "dangerous" in some way,
> such as modifying the state of the object when a non-modifying
> alternative method is available.
> --
> Posted via http://www.ruby-forum.com/.
>
>

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