Basic ruby Question

Ruby
1

Hello,

I didn’t understand the following concept.

*class Universe

private
def self.private_method
p “=========Hello world=======”
end

end

Universe.private_method => “=========Hello world=======”
*

How come I get the o/p ( *"=========Hello world=======" * ) as I have
declared that method as private.

Thanks in advance
Deepak G. (DG)

2

Hi All,

But it was working in this way.

class Universe
def self.private_method
p “=========Hello world=======”
end
end
u=Universe.new
u.private_method

=> private.rb:7: undefined method `private_method’ for

#Universe:0x2b66aa0 (NoMethodError)

what is the Difference betweeen these two types?

u=Universe.new
u.private_method && Universe.private_method

Regards,
P.Raveendran

3

Raveendran J. wrote:

But it was working in this way.

class Universe
def self.private_method
p “=========Hello world=======”
end
end
u=Universe.new
u.private_method

=> private.rb:7: undefined method `private_method’ for

#Universe:0x2b66aa0 (NoMethodError)

Your second example, does not work either. You tried to call a
class-method on an object.

I don’t know how useful a private class-method could be. it doesn’t make
to much sense for me.

i’m pretty sure, all you want is a simple instance-method: leave out the
“self.” at the methods declaration:

private
def private_method
p “something”
end

what is the Difference betweeen these two types?

u=Universe.new
u.private_method && Universe.private_method

for the difference between instance and class-methods use google on
there terms. the first explanation i found, should be sufficient:

4

On Friday 04 July 2008, Deepak G. wrote:

end

Universe.private_method => “=========Hello world=======”
*

How come I get the o/p ( *"=========Hello world=======" * ) as I have
declared that method as private.

Thanks in advance
Deepak G. (DG)

The private method only makes instance methods private, not class
methods.
This means the reason you can call Universe.private_method is that,
despite
its name, the method is still public. To make a class method private,
you can
use the Module#private_class_method method:

class Universe

def self.private_method
p “Hello world”
end

private_class_method :private_method

end

Universe.private_method

=> private method `private_method’ called for Universe:Class
(NoMethodError)

I hope this helps

Stefano

5

Hello stefano,

Thanks for your explanation.

On Fri, Jul 4, 2008 at 12:37 PM, Stefano C.
[email protected]