Private class methods- functionality or shortcoming?

Ruby
1

I just switched to Ruby and came across it.
If we have to make a class method private then we should write it as:

class Abc
   
    class<<self
        private
        def fun
            p “hello”
        end
    end
   
end

But if we write as:

class Abc
   
    private
    def self.fun
        p “hello”
    end

end

then the class method is not private but behaves as public.

So, is it a carefully designed functionality? If so, then what is the
thinking behind it?
OR any other reasons behind it?
Somebody told me that ruby encourages to define class methods the first
way.
But I think that if you are giving more than one methods to do a thing,
then all should function the same way.

Thanks and Regards,
Amit

2

On Monday 09 June 2008, amit saxena wrote:

    end
    end

Thanks and Regards,
Amit

The Module#private method only works for instance methods, not for class
method. To make a class method private, you should use the
Module#private_class_method method. Note that, unlike private,
private_class_method only accepts one argument, so that you want to make
more
than one method private, you should call it multiple times.

So, the correct method to make the method private using the second form
is:

class Abc

def self.fun
p “hello”
end
private_class_method :fun

end

I hope this helps

Stefano

3

"> The Module#private method only works for instance methods,

not for class
method."

My question is, why is it so? What’s the advantage in it?

Amit

— On Mon, 6/9/08, Stefano C. [email protected] wrote:

From: Stefano C. [email protected]
Subject: Re: private class methods- functionality or shortcoming?
To: “ruby-talk ML” [email protected]
Date: Monday, June 9, 2008, 7:39 PM
On Monday 09 June 2008, amit saxena wrote:

I just switched to Ruby and came across it.
If we have to make a class method private then we
should write it as:

class Abc

class<<self
    private
    def fun
        p "hello"
    end
end

end

But if we write as:

class Abc

private
def self.fun
    p "hello"
end

end

4

HELP…!!!