From: Yusuke Endoh <mame@...>
Date: 2011-10-19T00:31:44+09:00
Subject: [ruby-core:40209] Re: [Ruby 2.0 - Feature #5454] keyword arguments

Hello,

2011/10/19 Joshua Ballanco <jballanc@gmail.com>:
> � � # 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"]


Interesting.  Matz, which do you prefer?


Could you tell me the detail of MacRuby's keyword
arguments?
What's happen when all arguments are not given?

  def foo(a: first, b: second)
    p [first, second]
  end
  foo(a: 1) #=> [1, nil] ??
            # or
            #=> ArgumentError ??

Is there a feature to get the rest keyword arguments?

  def foo(a: first, b: second, **h)
    p [first, second, h]
  end
  foo(a:1, b:2, c:3, d:4) #=> [1, 2, {:c=>3, :d=>4}]

How about this?

  def foo(x, a: first, b: second)
    p [x, first, second]
  end
  foo(a: 1, b: 2) #=> [{:a=>1, :b=>2}, nil, nil] ??
                  # or
                  #=> wrong number of arguments ??

-- 
Yusuke Endoh <mame@tsg.ne.jp>