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Re: Module Pattern in Ruby

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On 10.09.2014 11:45, deltanoob wrote:

> I'm looking for a good tutorial on the "ruby way" to implement the module pattern in ruby.
>
> http://en.wikipedia.org/wiki/Module_pattern

"In software engineering, the module pattern is a design pattern used to 
implement the concept of software modules, defined by modular 
programming, in a programming language with incomplete direct support 
for the concept."

Now, Ruby _has_ support for modules - there is even a keyword of that 
name.  :-) If you need to store state in a module in the same way as can 
be done in a Modula or PL/SQL package you can simply define accessors:

irb(main):001:0> module Foo; @x = 1; class <<self; attr_accessor :x; 
end; end
=> nil
irb(main):002:0> Foo.x
=> 1
irb(main):003:0> Foo.x = 99
=> 99
irb(main):004:0> Foo.x
=> 99
irb(main):005:0> Foo.x =3
=> 3
irb(main):006:0> Foo.x
=> 3

Note: the initialization of @x is not necessary.

Kind regards

	robert

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Module Pattern in Ruby deltanoob <dexterp@gmail.com> - 2014-09-10 02:45 -0700
  Re: Module Pattern in Ruby Robert Klemme <shortcutter@googlemail.com> - 2014-09-10 22:29 +0200

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