From: Robert Klemme <shortcutter@...>
Date: 2013-07-06T06:21:25+09:00
Subject: Re: Implementing sort/sort!

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On Fri, Jul 5, 2013 at 8:22 PM, <sto.mar@web.de> wrote:

> Am 03.07.2013 09:30, schrieb Robert Klemme:
>
>  Usually with pairs of bang and non bang methods one can do
>>
>> def meth!
>>    # logic
>>    self
>> end
>>
>> def meth
>>    dup.tap {|copy| copy.meth!}
>> end
>>
>
> Hi Robert,
>
> I'm probably missing something obvious, but why not simply use
>
>   def meth
>     dup.meth!
>   end
>
> ?
>

Duh.  No, you're not missing anything here.  The only defense I have for
the other form I have is that it is independent of the return value of
#meth! - if you think of String#gsub! for example then your short version
will not work because sometimes that method will return nil.  That's
probably the reason I made my form a habit. :-)

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Fri, Jul 5, 2013 at 8:22 PM,  <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:sto.mar@web.de" target=3D"_blank">sto.mar@web.de</a>&gt;</span> wrote=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">
Am 03.07.2013 09:30, schrieb Robert Klemme:<div class=3D"im"><br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Usually with pairs of bang and non bang methods one can do<br>
<br>
def meth!<br>
=A0 =A0# logic<br>
=A0 =A0self<br>
end<br>
<br>
def meth<br>
=A0 =A0dup.tap {|copy| copy.meth!}<br>
end<br>
</blockquote>
<br></div>
Hi Robert,<br>
<br>
I&#39;m probably missing something obvious, but why not simply use<br>
<br>
=A0 def meth<br>
=A0 =A0 dup.meth!<br>
=A0 end<br>
<br>
?<span class=3D"HOEnZb"><font color=3D"#888888"><br></font></span></blockqu=
ote></div><div class=3D"gmail_extra"><br></div>Duh. =A0No, you&#39;re not m=
issing anything here. =A0The only defense I have for the other form I have =
is that it is independent of the return value of #meth! - if you think of S=
tring#gsub! for example then your short version will not work because somet=
imes that method will return nil. =A0That&#39;s probably the reason I made =
my form a habit. :-)</div>
<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">Kind regard=
s</div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">robe=
rt</div><div class=3D"gmail_extra"><div><br></div>-- <br>remember.guy do |a=
s, often| as.you_can - without end<br>
<a href=3D"http://blog.rubybestpractices.com/">http://blog.rubybestpractice=
s.com/</a>
</div></div>

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