Polymorphism ruby

G
Replacing 

Conditionals With

Polymorphism
@gpespn
“Any fool can write code that a
computer can understand.
Good programmers write code
that humans can understand.”



-- Martin Fowler
@gpespn
@gpespn
But why?
• Easier to read
• Maintainability
• Extensibility
• Isolation of change
• Easier to test
@gpespn
B+
@gpespn
C-
@gpespn
New Feature!
Guest sessions
@gpespn
@gpespn
F-
@gpespn
I just want to
send a message
to an object
@gpespn
-W
oof!
-M
eow
!
@gpespn
Polymorphism
tell don't ask
@gpespn
@gpespn
@gpespn
@gpespn
still have conditional!
@gpespn
Create a high
level abstract
class
@gpespn
@gpespn
Abstract Subclass Subclass
@gpespn
Polymorphism
@gpespn
@gpespn
Whats the catch?
• Parallel interfaces
• Design patterns that are confusing to those unfamiliar
to them
• New words/vocabulary into application. LOC went up!
• Increased big picture complexity in exchange for
macro clarity
• Too many Objects
@gpespn
@gpespn
Questions?
1 of 23

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Polymorphism ruby