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Hello,

"Stefan Lang" <perfectly.normal.hacker / gmail.com> wrote:
> "class << Array" opens the eigenclass of the Array object.
> Thus the foo method is only defined for the Array object itself.
> 
> "Array.class" returns the class of the Array object, which is Class.
> Defining a method with module_eval in there means that it
> is defined for _all_ class objects.
> 
> To demonstrate this, try to call the methods on another class:
> 
>     irb(main):017:0> String.foo
>     NoMethodError: undefined method `foo' for String:Class
>             from (irb):17
>     irb(main):018:0> String.bar
>     "inside bar"
> 
> Stefan
> 

thank you!

Greetings,
Niklas

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