OOP in Elixir

Transcript

1. OOP in Elixir Wojtek Mach
2. defmodule Person do defstruct [:name] end joe = %Person{name: "Joe"} robert = %Person{name: "Robert"} joe.name # => "Joe" robert.name # => "Robert"
3. defmodule Person do defstruct [:name] def say_hello_to(from, to) do IO.puts("#{from.name}: Hello, #{to.name}") end end joe = %Person{name: "Joe"} robert = %Person{name: "Robert"} joe.name # => "Joe" robert.name # => "Robert" Person.say_hello_to(joe, robert) # => Joe: Hello, Robert
5. import OOP
6. import OOP class Person do var :name end
7. import OOP class Person do var :name end joe = Person.new(name: "Joe") robert = Person.new(name: "Robert")
8. import OOP class Person do var :name end joe = Person.new(name: "Joe") robert = Person.new(name: "Robert") joe.name() # => "Joe" robert.name # => "Robert"
9. import OOP class Person do var :name def say_hello_to(who) do IO.puts("#{this.name}: #{who.name}") end end joe = Person.new(name: "Joe") robert = Person.new(name: "Robert") joe.name() # => "Joe" robert.name # => "Robert" joe.say_hello_to(robert) # => Joe: Hello, Robert
10. import class var def end end joe robert joe.name() # => "Joe" robert.name # => "Robert" joe.say_hello_to(robert) # => Joe: Hello, Robert this.name
11. joe = Person.new(name: "Joe") joe.set_name("Hipster Joe") # => :ok joe.name # => "Hipster Joe"
12. Q: How does it work?

13. Q: How does it work?
 A: You don’t want to know.
14. Q: How does it work?
 A: Macros.
15. Perhaps it’s not that bad…

16. Q: What’s worse than OOP?

17. Q: What’s worse than OOP?
 A: OOP with inheritance.
18. import OOP class Human do var :name end
19. import OOP class Human do var :name end class Doctor < Human do end
20. import OOP class Human do var :name end class Doctor < Human do def title do "Dr. #{name}" end end
21. import OOP class Human do var :name end class Doctor < Human do def title do "Dr. #{name}" end end dr = Doctor.new(name: "Jekyll") dr.title # => "Dr. Jekyll"
22. Perhaps it’s not that bad…

23. Q: What’s worse than OOP with inheritance?

24. Q: What’s worse than OOP with inheritance?
 A: OOP with multiple inheritance.
25. import OOP class Human do end
26. import OOP class Human do end class Spider do end
27. import OOP class Human do end class Spider do end class Spiderman < [Human, Spider] do end
28. Elixir Guidelines
29. Q: What’s the 1st rule of writing macros?
 Elixir Guidelines
30. Q: What’s the 1st rule of writing macros?
 A: Don’t write macros. Elixir Guidelines
31. Q: What’s the 1st rule of doing OOP in Elixir?
 Elixir Guidelines
32. Q: What’s the 1st rule of doing OOP in Elixir?
 A: Don’t do OOP in Elixir. Elixir Guidelines
34. • Elixir is powerful
 
 
 
 
 

35. • Elixir is powerful • DSLs, abstractions, semantics
 
 
 

36. • Elixir is powerful • DSLs, abstractions, semantics • Complexity
 

37. • Elixir is powerful • DSLs, abstractions, semantics • Complexity • Simplicty
38. Thank you! @wojtekmach wojtekmach/oop