modules

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From: jason joo on 9 Aug 2010 21:58

---

[Note: parts of this message were removed to make it a legal post.]

or just

include Test
yo

in such way?

2010/8/10 Markus Fischer <markus(a)fischer.name>

> Hi,
>
> On 09.08.2010 22:46, Rob Biedenharn wrote:
> > Or, if you want to use a module to hold methods to be mixed in to
> > another class:
> >
> > irb> module Test
> > irb> def yo
> > irb> puts 'yo'
> > irb> end
> > irb> end
> > => nil
> > irb> class Toy
> > irb> include Test
> > irb> end
> > => Toy
> > irb> Toy.new.yo
> > yo
> > => nil
>
> Interesting example. Is there another way to "access" or "make use" of
> "yo" besides including the module in a class? Or putting it another way:
> can I call yo directly when being defined that way?
>
> thanks
>
>
>

From: Rob Biedenharn on 9 Aug 2010 22:55

---

On Aug 9, 2010, at 6:37 PM, Markus Fischer wrote:
> Hi,
>
> On 09.08.2010 22:46, Rob Biedenharn wrote:
>> Or, if you want to use a module to hold methods to be mixed in to
>> another class:
>>
>> irb> module Test
>> irb> def yo
>> irb> puts 'yo'
>> irb> end
>> irb> end
>> => nil
>> irb> class Toy
>> irb> include Test
>> irb> end
>> => Toy
>> irb> Toy.new.yo
>> yo
>> => nil
>
> Interesting example. Is there another way to "access" or "make use" of
> "yo" besides including the module in a class? Or putting it another
> way:
> can I call yo directly when being defined that way?
>
> thanks
>

Well, hard you know what you mean, but does this help:

irb> hi = "hello"
=> "hello"
irb> hi.extend Test
=> "hello"
irb> hi
=> "hello"
irb> hi.yo
yo
=> nil

A Module is like a Class in most respects except that it cannot be
instantiated. (So there's no Test.new for that module Test.)

You can include a Module into a class to have its methods appear in
the lookup path for instances of that class. Or you can extend any
object like I did above.

You should try things out in irb and then ask questions when your
attempt to read the docs and understand the behavior fall short.

-Rob

Rob Biedenharn
Rob(a)AgileConsultingLLC.com http://AgileConsultingLLC.com/
rab(a)GaslightSoftware.com http://GaslightSoftware.com/

From: Brian Candler on 10 Aug 2010 08:57

---

Markus Fischer wrote:
> Interesting example. Is there another way to "access" or "make use" of
> "yo" besides including the module in a class? Or putting it another way:
> can I call yo directly when being defined that way?

Try "module_function".

module Test
def yo
puts 'yo'
end
module_function :yo
end

Test.yo

module Test
public :yo
end

a = Object.new
a.extend Test
a.yo

class Foo
include Test
end

Foo.new.yo
--
Posted via http://www.ruby-forum.com/.

From: Markus Fischer on 10 Aug 2010 18:09

---

On 10.08.2010 16:53, Matt Neuburg wrote:
> That's why my Ruby tutorial *starts* with modules:
>
> http://www.apeth.com/rubyIntro/justenoughruby.html

I'm currently sucking in everything I can find on ruby to iron out my
skills and I've to say, besides the official ruby tutorials and rails
stuff, that one gives a very nice insights, thanks!

- Markus

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