From: Alex van der Ruchei <little.spring17@...>
Date: 2013-01-13T05:24:17+09:00
Subject: Re: uniq vs uniq!

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Awesome explanation=21

On Sunday, 13 January 2013 =D0=B3. at 3:14, Dave Aronson wrote:

> On Sat, Jan 12, 2013 at 3:03 PM, rubyinfo <rubyinfo=40aptifuge.com (mai=
lto:rubyinfo=40aptifuge.com)> wrote:
> =20
> > 1.8.7 :001 > =5B=5D.uniq=21
> > =3D> nil
> > 1.8.7 :002 > =5B=5D.uniq
> > =3D> =5B=5D
> > =20
> > 1.9.3p194 :001 > =5B=5D.uniq
> > =3D> =5B=5D
> > 1.9.3p194 :002 > =5B=5D.uniq=21
> > =3D> nil
> > =20
> > =20
> > Why =3F
> =20
> Why what=3F
> =20
> Why are the results reversed=3F They're not, you typed them in one
> order the first time and the other the second.
> =20
> Why does the bang version return nil=3F As the docs
> (http://www.ruby-doc.org/core-1.9.3/Array.html=23method-i-uniq-21) say,=

> =22Returns nil if no changes are made (that is, no duplicates are
> found).=22 Of course in =5B=5D there will be no dups.
> =20
> Why IS there a difference=3F Generally, when there are both bang and
> normal versions of a method, the bang version affects the object
> passed in, while the normal version acts on (and returns) a duplicate.
> In the bang case, you usually don't care about the return value, and
> are using it instead for the effect on the receiver.
> =20
> Why do fools fall in love=3F Why do birds sing=3F Why is this night
> different from all other nights=3F Why ask why, drink Bud Dry=21 ;-)
> =20
> -Dave
> =20
> -- =20
> Dave Aronson, the T. Rex of Codosaurus LLC,
> secret-cleared freelance software developer
> taking contracts in or near NoVa or remote.
> See information at http://www.Codosaur.us/.
> =20
> =20
> =20



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                <div style=3D=22font-family: Helvetica; font-size: 13px; =
=22>Awesome explanation=21</div>
                =20
                 =20
                <p style=3D=22color: =23A0A0A8;=22>On Sunday, 13 January =
2013&nbsp;=D0=B3. at 3:14, Dave Aronson wrote:</p><blockquote type=3D=22c=
ite=22><div>
                    <span><div><div><div>On Sat, Jan 12, 2013 at 3:03 PM,=
 rubyinfo &lt;<a href=3D=22mailto:rubyinfo=40aptifuge.com=22>rubyinfo=40a=
ptifuge.com</a>&gt; wrote:</div><div><br></div><blockquote type=3D=22cite=
=22><div><div>1.8.7 :001 &gt; =5B=5D.uniq=21</div><div> =3D&gt; nil</div>=
<div>1.8.7 :002 &gt; =5B=5D.uniq</div><div> =3D&gt; =5B=5D</div><div><br>=
</div><div>1.9.3p194 :001 &gt; =5B=5D.uniq</div><div> =3D&gt; =5B=5D</div=
><div>1.9.3p194 :002 &gt; =5B=5D.uniq=21</div><div> =3D&gt; nil</div><div=
><br></div><div><br></div><div>Why =3F</div></div></blockquote><div><br><=
/div><div>Why what=3F</div><div><br></div><div>Why are the results revers=
ed=3F  They're not, you typed them in one</div><div>order the first time =
and the other the second.</div><div><br></div><div>Why does the bang vers=
ion return nil=3F  As the docs</div><div>(<a href=3D=22http://www.ruby-do=
c.org/core-1.9.3/Array.html=23method-i-uniq-21=22>http://www.ruby-doc.org=
/core-1.9.3/Array.html=23method-i-uniq-21</a>) say,</div><div>=22Returns =
nil if no changes are made (that is, no duplicates are</div><div>found).=22=
  Of course in =5B=5D there will be no dups.</div><div><br></div><div>Why=
 IS there a difference=3F  Generally, when there are both bang and</div><=
div>normal versions of a method, the bang version affects the object</div=
><div>passed in, while the normal version acts on (and returns) a duplica=
te.</div><div> In the bang case, you usually don't care about the return =
value, and</div><div>are using it instead for the effect on the receiver.=
</div><div><br></div><div>Why do fools fall in love=3F  Why do birds sing=
=3F  Why is this night</div><div>different from all other nights=3F  Why =
ask why, drink Bud Dry=21  ;-)</div><div><br></div><div>-Dave</div><div><=
br></div><div>-- </div><div>Dave Aronson, the T. Rex of Codosaurus LLC,</=
div><div>secret-cleared freelance software developer</div><div>taking con=
tracts in or near NoVa or remote.</div><div>See information at <a href=3D=
=22http://www.Codosaur.us=22>http://www.Codosaur.us</a>/.</div></div></di=
v></span>
                 =20
                 =20
                 =20
                 =20
                </div></blockquote><div>
                    <br>
                </div>
            
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