Why Best Practices?

This is JEG2's segment of the Ruby Rogues panel form LSRC 2013.

Transcript

1. I Only Have Time to
   Make One Point
   The others made me include this slide!
   

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2. .
   

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3. Thanks!
   

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4. Why Best Practices?
   

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5. How Should We
   Use Struct?
   class Specialized < Struct.new(:whatever)
   # ... define custom methods here...
   end
   Specialized = Struct.new(:whatever) do
   # ... define custom methods here...
   end
   

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6. I Prefer the Block Form
   But that’s not the point!
   

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7. Code Similarity
   and Malleability
   Specialized = Struct.new(:whatever) do
   # ... define custom methods here...
   end
   Trivial = Struct.new(:whatever)
   

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8. An Extra Class
   • The anonymous class
   doesn’t tell us much
   • Code reloading may
   cause “TypeError:
   superclass mismatch…”
   [Specialized,
   #,
   Struct,
   Enumerable,
   Object,
   PP::ObjectMixin,
   Kernel,
   BasicObject]
   class Specialized < Struct.new(:whatever)
   # ... define custom methods here...
   end
   

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9. The “super” Problem
   class Specialized < Struct.new(:whatever)
   def whatever
   super || :default
   end
   include SomeMixin
   end
   Specialized = Struct.new(:whatever) do
   def whatever
   self[:whatever] || :default
   end
   prepend SomeMixin
   end
   

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10. The Point
    • It’s not about the one right way to code
    • It’s about what we learn in the discussion
    • This trivial example alone includes:
    • Code malleability
    • The ancestor class chain
    • The value of prepend
    

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