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DRY 2.0

Philippe Creux
December 01, 2016
Programming
1
400

DRY 2.0

DRY (Don't Repeat Yourself) is often defined as "No Code Duplication". That's DRY 1.0. The DRY principle really shimes in when you get it to the next level: "No Knowledge Duplication".

This lightning talk was given at #VanRuby Lightning Talk Meetup on Dec 1st 2016.

Philippe Creux

December 01, 2016
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Transcript

  1. @pcreux
    VanRuby - Dec 1st 2016
    DRY 2.0

    View Slide

  2. @pcreux
    VanRuby - Dec 1st 2016
    D
    R
    Y

    View Slide

  3. @pcreux
    VanRuby - Dec 1st 2016
    D on’t
    R epeat
    Y ourself

    View Slide

  4. @pcreux
    VanRuby - Dec 1st 2016

    View Slide

  5. @pcreux
    VanRuby - Dec 1st 2016
    “For example, if you’ve duplicated a bit of
    code in many places, the Don’t Repeat
    Yourself (DRY) principle tells you to extract
    the duplication into a single common
    method and then invoke this new method in
    place of the old code.”

    View Slide

  6. @pcreux
    VanRuby - Dec 1st 2016
    DRY
    =
    NO Code Duplication

    View Slide

  7. @pcreux
    VanRuby - Dec 1st 2016

    View Slide

  8. @pcreux
    VanRuby - Dec 1st 2016

    View Slide

  9. @pcreux
    VanRuby - Dec 1st 2016

    View Slide

  10. @pcreux
    VanRuby - Dec 1st 2016
    DRY
    =
    NO Code Duplication

    View Slide

  11. @pcreux
    VanRuby - Dec 1st 2016
    DRY 1.0
    =
    NO Code Duplication

    View Slide

  12. @pcreux
    VanRuby - Dec 1st 2016
    DRY 2.0
    =
    NO KNOWLEDGE Duplication

    View Slide

  13. @pcreux
    VanRuby - Dec 1st 2016

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  14. @pcreux
    VanRuby - Dec 1st 2016

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  15. @pcreux
    VanRuby - Dec 1st 2016

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  16. @pcreux
    VanRuby - Dec 1st 2016
    Free
    Starter
    Pro99
    Pro199
    Pro499

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  17. @pcreux
    VanRuby - Dec 1st 2016

    View Slide

  18. @pcreux
    VanRuby - Dec 1st 2016

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  19. @pcreux
    VanRuby - Dec 1st 2016
    Free
    Starter
    Pro99
    Pro199
    Pro499
    NEW PRICING!
    Free
    Startup
    Prime
    Premium
    …

    View Slide

  20. @pcreux
    VanRuby - Dec 1st 2016

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  21. @pcreux
    VanRuby - Dec 1st 2016

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  22. @pcreux
    VanRuby - Dec 1st 2016

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  23. @pcreux
    VanRuby - Dec 1st 2016

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  24. @pcreux
    VanRuby - Dec 1st 2016
    How did we get there?

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  25. @pcreux
    VanRuby - Dec 1st 2016
    KNOWLEDGE Duplication

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  26. @pcreux
    VanRuby - Dec 1st 2016
    Let’s FIX IT!

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  27. @pcreux
    VanRuby - Dec 1st 2016

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  28. @pcreux
    VanRuby - Dec 1st 2016
    ONE SOURCE of TRUTH

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  29. @pcreux
    VanRuby - Dec 1st 2016
    ExAMPLE:
    POLICY OBJECT

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  30. @pcreux
    VanRuby - Dec 1st 2016
    POLICY OBJECT

    Can I do X?

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  31. @pcreux
    VanRuby - Dec 1st 2016
    POLICY OBJECT

    cancancan
    pundit

    …

    View Slide

  32. @pcreux
    VanRuby - Dec 1st 2016
    ONE SOURCE of TRUTH
    =
    RICH DATA MODEL

    View Slide

  33. @pcreux
    VanRuby - Dec 1st 2016

    View Slide

  34. @pcreux
    VanRuby - Dec 1st 2016
    DRY
    =
    NO CODE DUPLICATION
    +
    NO KNOWLEDGE Duplication

    View Slide