C++ Design Principles for Ruby - Some classes don't want kids.

Discussion in 'Ruby' started by John Carter, Aug 2, 2005.

  1. John Carter

    John Carter Guest

    Avoid inheriting from concrete classes, to add behaviour add non-member
    functions, to add state use composition.

    In ruby I would change this to..

    To add behaviour, don't be shy, in Ruby you can always extend a concrete
    class when you need to.


    class String
    def my_nifty_func

    To add state, I agree with them, use composition. Why? Unless you cover
    every use of String, you may have an operation somewhere that
    accidentally loses that extra state.

    John Carter Phone : (64)(3) 358 6639
    Tait Electronics Fax : (64)(3) 359 4632
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    Carter's Clarification of Murphy's Law.

    "Things only ever go right so that they may go more spectacularly wrong later."

    From this principle, all of life and physics may be deduced.
    John Carter, Aug 2, 2005
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