From: Philipp Meier <meier@...>
Date: 2002-07-31T02:13:38+09:00
Subject: Re: Ruby Language Q's


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On Wed, Jul 31, 2002 at 01:27:57AM +0900, Yukihiro Matsumoto wrote:
> In message "Ruby Language Q's"
>     on 02/07/30, "Justin Johnson" <justinj@mobiusent.com> writes:

> |2. I like the idea of named method parameters (ala Smalltalk, Objective-=
C).
> |There was a discussion elsewhere showing something similar using hash
> |tables.  With a bit of syntactic sugar...   :var =3D> 10 could be  var: =
10
>=20
> I want something more, for example:
>=20
>   class PC
>     def initialize(cpu:, os: "Windows", **info)
>       @cpu =3D cpu        # "cpu" is a mandatory named arg
>       @os =3D os          # "os" is with the default value
>       @info =3D info      # symbol=3D>value hashtable
>     end
>   end
>   PC.new(os: "Linux", cpu: "P-III", clock: "600MHz", hdd: "30G")

I'd prefer "=3D" instead of ":" because passing parameters is a kind of
assignment in the scope of the functions body:

   class PC
     def initialize(cpu, os=3D"Windows", **info)
       @cpu =3D cpu        # "cpu" is a mandatory named arg
       @os =3D os          # "os" is with the default value
       @info =3D info      # symbol=3D>value hashtable
     end
   end
   PC.new(os=3D"Linux", cpu=3D"P-III", clock=3D"600MHz", hdd=3D"30G")

Although I must admit that this is incompatible to how ruby works
currently:

def foo(param=3D"bar")
	param
end

param=3D"my value"

foo()   		# =3D> "bar"
foo("baz")		# =3D> "baz"
foo(param=3D"qux")	# =3D> "qux"
param			# =3D> "qux" !!!

Therefor there certainly is a need for discussion :)

-billy

--=20
Meisterbohne       S=F6flinger Stra=DFe 100          Tel: +49-731-399 499-0
   eL=F6sungen       89077 Ulm                     Fax: +49-731-399 499-9

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