List methods only for specific class

ruby-talk
1

hello folks!

Is there a way to list methods only for specific class, i.e., not
inherited?

Thank you!

···

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2

object.public_methods(false)

Hope this helps!

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On Mon, Jun 15, 2009 at 12:38 AM, Le Sa <lescoutinhovr@gmail.com> wrote:

hello folks!

Is there a way to list methods only for specific class, i.e., not
inherited?

Thank you!
--
Posted via http://www.ruby-forum.com/\.

--
Daniel Roux

3

  robert

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On 15.06.2009 07:38, Le Sa wrote:

Is there a way to list methods only for specific class, i.e., not
inherited?

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

4

so many replies hehe. you are amazing!!!

thank you all!!!

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5

I would like to list ms1 and ms2, but thanks for the help!

class Person
  def mp1() end
end

class Student < Person
  def ms1() end
  def ms2() end

  private :ms2
end

Student.public_methods(false).each {|m|puts m}
puts "************\n"
Student.instance_methods(false).each{|m|puts m}
=begin
OUTPUT IS:

yaml_tag_subclasses?
allocate
to_yaml
superclass
new

···

************
ms1
=end
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6

No problem!
instance_methods(false) is fine, because I won't be able to use private
methods anyway xD

Le Sa wrote:

···

I would like to list ms1 and ms2, but thanks for the help!

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Posted via http://www.ruby-forum.com/\.

7

I would like to list ms1 and ms2, but thanks for the help!

class Person
def mp1() end
end

class Student < Person
def ms1() end
def ms2() end

private :ms2
end

The closest I have to offer is this:

Student.new.methods - Object.instance_methods

=> ["ms1", "mp1"]

···

On Mon, Jun 15, 2009 at 5:27 PM, Le Sa<lescoutinhovr@gmail.com> wrote:

8

Try:
Student.new.public_methods(false) + Student.new.private_methods(false)
=> ["ms1", "ms2"]

···

On Mon, Jun 15, 2009 at 10:27 AM, Le Sa <lescoutinhovr@gmail.com> wrote:

I would like to list ms1 and ms2, but thanks for the help!

class Person
def mp1() end
end

class Student < Person
def ms1() end
def ms2() end

private :ms2
end

Student.public_methods(false).each {|m|puts m}
puts "************\n"
Student.instance_methods(false).each{|m|puts m}
=begin
OUTPUT IS:

yaml_tag_subclasses?
allocate
to_yaml
superclass
new
************
ms1
=end
--
Posted via http://www.ruby-forum.com/\.

--
Daniel Roux

9

Why do you folks create instances? You can do this as well:

cl = any_class
cl.instance_methods(false) - cl.private_instance_methods

Kind regards

robert

···

2009/6/15 Daniel Roux <danielroux@gmail.com>:

Try:
Student.new.public_methods(false) + Student.new.private_methods(false)
=> ["ms1", "ms2"]

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

10

Often, I'm most interested in methods unique to a given class and not those inherited from, say, Object:

(Array.instance_methods - Array.private_instance_methods - Object.public_methods).sort

And I sort them for easier reference. Don't know if this adds any information...

···

On Jun 16, 2009, at 12:04 AM, Robert Klemme wrote:

2009/6/15 Daniel Roux <danielroux@gmail.com>:

Try:
Student.new.public_methods(false) + Student.new.private_methods(false)
=> ["ms1", "ms2"]

Why do you folks create instances? You can do this as well:

cl = any_class
cl.instance_methods(false) - cl.private_instance_methods

Kind regards

robert

11

Steve Ross wrote:

Often, I'm most interested in methods unique to a given class and not
those inherited from, say, Object:

(Array.instance_methods - Array.private_instance_methods -
Object.public_methods).sort

And I sort them for easier reference. Don't know if this adds any
information...

If you really want unique to the class, and the class may have a more
complex object hieararchy than just inheriting from Object, why not
something like:

(MyClass.methods - MyClass.superclass.methods)

I _think_ that'll work, although how included modules in MyClass are
treated should be tested experimentally. I think it'll still work cause
of the magic anonymous singleton class thing ruby uses for module
mix-ins and such.

The trick in both Steve's and my attempt is the really useful '-'
operator/method on Arrays, which does array difference. So useful! See
also '&' for array intersection. Can save you a lot of hacky code if you
remember they're there.

Jonathan

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