From: Joshua Ballanco <jballanc@...>
Date: 2011-10-19T00:14:13+09:00
Subject: [ruby-core:40207] Re: [Ruby 2.0 - Feature #5454] keyword arguments

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On Tue, Oct 18, 2011 at 1:33 AM, Haase, Konstantin <
Konstantin.Haase@student.hpi.uni-potsdam.de> wrote:

> Also, these are really named arguments in a Python sense, not keyword
> arguments in a Smalltalk sense.
>

I just wanted to point out that MacRuby (in order to support compatibility
with Obj-C which uses Smalltalk style keyword arguments) already uses the
hash syntax for defining/calling methods, but the semantics are different
from what is being proposed here, if I understand correctly. To summarize:

    # Ruby 2.0 proposal:
    def foo(a: 1, b: 2, c: 3)
        puts [a, b, c]
    end
    foo(a: 'one', b: 'two', c: 'three') #=> ["one", "two", "three"]

    # Currently in MacRuby:
    def foo(a: first, b: second, c: third)
        puts [first, second, third]
    end
    foo(a: 'one', b: 'two', c: 'three') #=> ["one", "two", "three"]

With the current proposal for keyword arguments, I think MacRuby would not
be able to implement this feature.

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<div class=3D"gmail_quote">On Tue, Oct 18, 2011 at 1:33 AM, Haase, Konstant=
in <span dir=3D"ltr">&lt;<a href=3D"mailto:Konstantin.Haase@student.hpi.uni=
-potsdam.de">Konstantin.Haase@student.hpi.uni-potsdam.de</a>&gt;</span> wro=
te:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex;">Also, these are really named arguments in a=
 Python sense, not keyword arguments in a Smalltalk sense.<br></blockquote>
<div><br></div><div>I just wanted to point out that MacRuby (in order to su=
pport compatibility with Obj-C which uses Smalltalk style keyword arguments=
) already uses the hash syntax for defining/calling methods, but the semant=
ics are different from what is being proposed here, if I understand correct=
ly. To summarize:</div>
<div><br></div><div>=C2=A0 =C2=A0 # Ruby 2.0 proposal:</div><div>=C2=A0 =C2=
=A0 def foo(a: 1, b: 2, c: 3)</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 puts [a=
, b, c]</div><div>=C2=A0 =C2=A0 end</div><div>=C2=A0 =C2=A0 foo(a: &#39;one=
&#39;, b: &#39;two&#39;, c: &#39;three&#39;) #=3D&gt; [&quot;one&quot;, &qu=
ot;two&quot;, &quot;three&quot;]</div>
<div><br></div><div>=C2=A0 =C2=A0 # Currently in MacRuby:</div><div>=C2=A0 =
=C2=A0 def foo(a: first, b: second, c: third)</div><div>=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 puts [first, second, third]</div><div>=C2=A0 =C2=A0 end</div><di=
v><div>=C2=A0 =C2=A0 foo(a: &#39;one&#39;, b: &#39;two&#39;, c: &#39;three&=
#39;) #=3D&gt; [&quot;one&quot;, &quot;two&quot;, &quot;three&quot;]</div>
</div><div><br></div><div>With the current proposal for keyword arguments, =
I think MacRuby would not be able to implement this feature.</div></div>

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