From: 7stud -- <dolgun@...>
Date: 2007-09-09T22:05:21+09:00
Subject: Re: module_function :func vs. MyModule.func?

Logan Capaldo wrote:
> On 9/9/07, 7stud -- <dolgun@excite.com> wrote:
> 
>> What is module_function used for?
>> --
> 
> module_function is used to help give us namespaces. The most visible
> example is the Math module. Every method in there is
> module_function'ed.
> 
> 2 * Math.sin( 3.4 ) + Math.exp(24) # boy it sure is tiring typing
> Math. all the time
> include Math
> 2 * sin(3.4) + exp(24) # much better

Ah hah!  A difference I can discern:

module MyModule
    def MyModule.greet
        puts "hello"
    end
end

MyModule.greet
#boy it sure is tiring typing MyModule every time I want to say hello

include MyModule
greet

--output:--
hello
r1test.rb:10: undefined local variable or method `greet' for main:Object 
(NameError)

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