From: Alex aka Sinm <sinm.sinm@...>
Date: 2013-02-09T05:11:28+09:00
Subject: [ruby-core:52044] Re: [ruby-trunk - Feature #6721] Object#yield_self

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Why you can't simply do the following=3F

def full=5Fname=5Fwith=5Faffiliation=5Fand=5Fposition
  a=5Fap =3D =22 (=23=7Ba=5Fap=7D)=22 unless (a=5Fap =3D =5Baffiliation, =
academic=5Fposition=5D.compact.join ', ').empty=3F
  =22=23=7Bfull=5Fname=7D=23=7Ba=5Fap=7D=22


end



On =46riday, 8 =46ebruary 2013 =D0=B3. at 17:41, alexeymuranov (Alexey Mu=
ranov) wrote:

> =20
> Issue =236721 has been updated by alexeymuranov (Alexey Muranov).
> =20
> =20
> =3Dbegin
> Here is a =22real life=22 use case. It again has to do with formatting =
strings.
> =20
> I want to have a list of conference participants in the form:
> =46ull Name (Affiliation, academic position)
> but without empty parentheses or trailing comma if the person has not
> profided the affiliation or the position. So i did like this:
> =20
> class Participant
> def full=5Fname=5Fwith=5Faffiliation=5Fand=5Fposition
> full=5Fname +
> lambda =7B =7Ca=5Fap=7C a=5Fap.empty=3F =3F '' : =22 (=23=7B a=5Fap =7D=
)=22 =7D=5B=5Baffiliation, academic=5Fposition=5D.compact.join(', ')=5D
> end
> end
> =20
> (I will appreciate any more elegant solution.)
> =20
> With ((=7B=23yield=5Fself=7D)) (or any other name for it), i would have=
 written:
> =20
> class Participant
> def full=5Fname=5Fwith=5Faffiliation=5Fand=5Fposition
> full=5Fname +
> =5Baffiliation, academic=5Fposition=5D.compact.join(', ')=5D.yield=5Fse=
lf =7B =7Ca=5Fap=7C a=5Fap.empty=3F =3F '' : =22 (=23=7B a=5Fap =7D)=22 =7D=

> end
> end
> =20
> This would be a bit more readable for me.
> =3Dend
> =20
> ----------------------------------------
> =46eature =236721: Object=23yield=5Fself
> https://bugs.ruby-lang.org/issues/6721=23change-36056
> =20
> Author: alexeymuranov (Alexey Muranov)
> Status: Open
> Priority: Normal
> Assignee: =20
> Category: core
> Target version: next minor
> =20
> =20
> =3Dbegin
> I think the following method is missing from Ruby:
> =20
> class Object
> def yield=5Fself(*args)
> yield(self, *args)
> end
> end
> =20
> I do not know a good use case, but it looks very natural to me. It can =
be used in method chains.
> =20
> What do you think=3F Is there an alternative=3F
> =3Dend
> =20
> =20
> =20
> -- =20
> http://bugs.ruby-lang.org/
> =20
> =20



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                <div style=3D=22font-family: Helvetica; font-size: 13px; =
=22>Why you can't simply do the following=3F<div><br></div><div>def&nbsp;=
full=5Fname=5Fwith=5Faffiliation=5Fand=5Fposition<br><div>&nbsp;&nbsp;a=5F=
ap&nbsp;=3D =22 (=23=7Ba=5Fap=7D)=22 unless (a=5Fap&nbsp;=3D =5Baffiliati=
on,&nbsp;academic=5Fposition=5D.compact.join ', ').empty=3F<div>&nbsp; =22=
=23=7Bfull=5Fname=7D=23=7Ba=5Fap=7D=22</div></div></div><div>end</div></d=
iv>
                <div></div>
                =20
                <p style=3D=22color: =23A0A0A8;=22>On =46riday, 8 =46ebru=
ary 2013&nbsp;=D0=B3. at 17:41, alexeymuranov (Alexey Muranov) wrote:</p>=

                <blockquote type=3D=22cite=22 style=3D=22border-left-styl=
e:solid;border-width:1px;margin-left:0px;padding-left:10px;=22>
                    <span><div><div><div><br></div><div>Issue =236721 has=
 been updated by alexeymuranov (Alexey Muranov).</div><div><br></div><div=
><br></div><div>=3Dbegin</div><div>Here is a =22real life=22 use case.  I=
t again has to do with formatting strings.</div><div><br></div><div>I wan=
t to have a list of conference participants in the form:</div><div> =46ul=
l Name (Affiliation, academic position)</div><div>but without empty paren=
theses or trailing comma if the person has not</div><div>profided the aff=
iliation or the position.  So i did like this:</div><div><br></div><div> =
 class Participant</div><div>    def full=5Fname=5Fwith=5Faffiliation=5Fa=
nd=5Fposition</div><div>      full=5Fname +</div><div>        lambda =7B =
=7Ca=5Fap=7C a=5Fap.empty=3F =3F '' : =22 (=23=7B a=5Fap =7D)=22 =7D=5B=5B=
affiliation, academic=5Fposition=5D.compact.join(', ')=5D</div><div>    e=
nd</div><div>  end</div><div><br></div><div>(I will appreciate any more e=
legant solution.)</div><div><br></div><div>With ((=7B=23yield=5Fself=7D))=
 (or any other name for it), i would have written:</div><div><br></div><d=
iv>  class Participant</div><div>    def full=5Fname=5Fwith=5Faffiliation=
=5Fand=5Fposition</div><div>      full=5Fname +</div><div>        =5Baffi=
liation, academic=5Fposition=5D.compact.join(', ')=5D.yield=5Fself =7B =7C=
a=5Fap=7C a=5Fap.empty=3F =3F '' : =22 (=23=7B a=5Fap =7D)=22 =7D</div><d=
iv>    end</div><div>  end</div><div><br></div><div>This would be a bit m=
ore readable for me.</div><div>=3Dend</div><div><br></div><div>----------=
------------------------------</div><div>=46eature =236721: Object=23yiel=
d=5Fself</div><div><a href=3D=22https://bugs.ruby-lang.org/issues/6721=23=
change-36056=22>https://bugs.ruby-lang.org/issues/6721=23change-36056</a>=
</div><div><br></div><div>Author: alexeymuranov (Alexey Muranov)</div><di=
v>Status: Open</div><div>Priority: Normal</div><div>Assignee: </div><div>=
Category: core</div><div>Target version: next minor</div><div><br></div><=
div><br></div><div>=3Dbegin</div><div>I think the following method is mis=
sing from Ruby:</div><div><br></div><div> class Object</div><div>   def y=
ield=5Fself(*args)</div><div>     yield(self, *args)</div><div>   end</di=
v><div> end</div><div><br></div><div>I do not know a good use case, but i=
t looks very natural to me.  It can be used in method chains.</div><div><=
br></div><div>What do you think=3F  Is there an alternative=3F</div><div>=
=3Dend</div><div><br></div><div><br></div><div><br></div><div>-- </div><d=
iv><a href=3D=22http://bugs.ruby-lang.org=22>http://bugs.ruby-lang.org</a=
>/</div></div></div></span>
                =20
                =20
                =20
                =20
                </blockquote>
                =20
                <div>
                    <br>
                </div>
            
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