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OOP in Elixir
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Wojtek Mach
February 17, 2016
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290
OOP in Elixir
Wojtek Mach
February 17, 2016
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Transcript
OOP in Elixir Wojtek Mach
defmodule Person do defstruct [:name] end joe = %Person{name: "Joe"}
robert = %Person{name: "Robert"} joe.name # => "Joe" robert.name # => "Robert"
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
None
import OOP
import OOP class Person do var :name end
import OOP class Person do var :name end joe =
Person.new(name: "Joe") robert = Person.new(name: "Robert")
import OOP class Person do var :name end joe =
Person.new(name: "Joe") robert = Person.new(name: "Robert") joe.name() # => "Joe" robert.name # => "Robert"
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
import class var def end end joe robert joe.name() #
=> "Joe" robert.name # => "Robert" joe.say_hello_to(robert) # => Joe: Hello, Robert this.name
joe = Person.new(name: "Joe") joe.set_name("Hipster Joe") # => :ok joe.name
# => "Hipster Joe"
Q: How does it work?
Q: How does it work? A: You don’t want to
know.
Q: How does it work? A: Macros.
Perhaps it’s not that bad…
Q: What’s worse than OOP?
Q: What’s worse than OOP? A: OOP with inheritance.
import OOP class Human do var :name end
import OOP class Human do var :name end class Doctor
< Human do end
import OOP class Human do var :name end class Doctor
< Human do def title do "Dr. #{name}" end end
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"
Perhaps it’s not that bad…
Q: What’s worse than OOP with inheritance?
Q: What’s worse than OOP with inheritance? A: OOP with
multiple inheritance.
import OOP class Human do end
import OOP class Human do end class Spider do end
import OOP class Human do end class Spider do end
class Spiderman < [Human, Spider] do end
Elixir Guidelines
Q: What’s the 1st rule of writing macros? Elixir Guidelines
Q: What’s the 1st rule of writing macros? A: Don’t
write macros. Elixir Guidelines
Q: What’s the 1st rule of doing OOP in Elixir?
Elixir Guidelines
Q: What’s the 1st rule of doing OOP in Elixir?
A: Don’t do OOP in Elixir. Elixir Guidelines
None
• Elixir is powerful
• Elixir is powerful • DSLs, abstractions, semantics
• Elixir is powerful • DSLs, abstractions, semantics • Complexity
• Elixir is powerful • DSLs, abstractions, semantics • Complexity
• Simplicty
Thank you! @wojtekmach wojtekmach/oop