>def foo
>  some function
>end
>
># get user input
>user input 1
>user input 2
>
> foo(user input, option number)

As you are (so far) writing in a procedural style, I think foo looks
more natural than user_input.foo. Your first procedure (which might be
foo in this case) needs to route according to the selected option.

The basic rule of all programming, not just OO, is to create a set of
methods - some clearly acting as controllers , and others carrying out
tasks - that divide the problem up into discrete encapsulated 'black
box' units. So just avoid jumbling up too much functionality in any 
given
method.

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