Re: Metaprogrammatically defining methods with required, optional, required keyword and optional keyword parameters?

Ah. Wait, no. That won't quite work.

Because I still cannot programatically create that block at run time.

ie. If instead of giving the parameter list at ruby invocation time,.... I
want at run time to do something very similar to the Struct facility...

def SmartStruct.create_struct_class(
          require_list, # Ordered Hash of positional parameter to expected
class.
          defaults: {}, # Hash of sym: default_value
          required_keyword_list: {}, # Hash of sym: expected class
          keyword_list: {}, # Map from keyword sym to default
          accessors: []) # Array of syms to provide accessors for

I then want to generate a Class that will have the specified parameters and
defaults and will type check them at run time.


On Mon, Jun 17, 2019 at 6:58 PM Marvin Gülker <[email protected]>
wrote:

> Am 17. Juni 2019 um 10:20 Uhr +1200 schrieb John Carter:
> > However modern ruby now has required parameters, default parameters,
> > required keyword parameters and optional keyword parameters and an
> > optional a block parameter.
> > [...]
> > Any idea how to define (at run time) the parameter list for a method?
>
> Here's your example with define_method:
>
>     define_method(:foo) do |bar, baz, but = 0, joke:, nojoke: 10, &block|
>       p [bar, baz, but, joke, nojoke, block]
>       block.call
>     end
>
>     foo(1, 2, joke: 50){puts "I'm a block!"}
>
> Is that what you are looking for?
>
> --
> Blog: https://mg.guelker.eu
>
> Unsubscribe: <mailto:[email protected]?subject=unsubscribe>
> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-talk>
>


-- 
John Carter
Phone : (64)(3) 358 6639
Tait Electronics
PO Box 1645 Christchurch
New Zealand

-- 
This Communication is Confidential. We only send and receive email on the

basis of the terms set out at www.taitradio.com/email_disclaimer 
<http://www.taitradio.com/email_disclaimer>


Unsubscribe: <mailto:[email protected]?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-talk>