Different between the "::" and "."

Ruby
1

Hello,

class Myclass
def Myclass.hi
“hi”
end
def Myclass::hello
“hello”
end
end

what’s the difference between Myclass.hi and Myclass::hello here?

Thanks.

2

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Am 11.12.2010 14:25, schrieb zuerrong:

what’s the difference between Myclass.hi and Myclass::hello here?

Thanks.

In your example they’re just the same. But have a look at this:

module Foo

class Bar
end

end

x = Foo::Bar.new #=> a new instance of Foo::Bar
x = Foo.Bar.new #=> error

The :: operator is normally used to resolve namespaces–in your example
you used it for a class method which is perfectly fine although I think
this style is old-ish and not used widely anymore. I personally use the
point operator for calling methods on any objects. Classes are just
normal objects in Ruby, so why use a special syntax there?

Vale,
Marvin
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3

On Sat, 11 Dec 2010 22:25:17 +0900, zuerrong wrote:

what’s the difference between Myclass.hi and Myclass::hello here?

Thanks.

Quoting Pickaxe (p349):

The only difference between :: and . occurs with uppercase identifiers.
Ruby will assume that receiver::Thing is actually an attempt to access a
constant named Thing unless the method invocation has a parameter list
between parentheses