paiza.ioでelixir その39

概要

paiza.ioでelixirやってみた。
defstruct再考。

サンプルコード

defmodule Point do
	defstruct x: 0, y: 0
	def add(%Point{x: x, y: y}, %Point{x: other_x, y: other_y}) do
		%Point{
		    x: x + other_x, 
		    y: y + other_y
		}
	end
end
defmodule Main do
    require Point
    p1 = %Point{
	    x: 1, 
	    y: 2
	}
	p2 = %Point{
	    x: 3, 
	    y: 4
	}
	IO.inspect Point.add(p1, p2)
end

defmodule Person do
	defstruct name: 'unknown', age: 0
end
defmodule Hoge do
	require Person
	def hoge do
		default_person = %Person{}
		tanaka = %Person{
		    name: 'tanaka', 
		    age: 24
		}
		Hoge.print_person(default_person)
		Hoge.print_person(tanaka)
	end
	def print_person(person) do
		IO.inspect person
		IO.puts person.name
		IO.inspect person.age
	end
end
Hoge.hoge

defmodule User do
	defstruct [:name, :age]
end
defmodule Main do
	require User
	alice = %User{
	    name: "Alice", 
	    age: 20
	}
	IO.inspect alice.name
end

実行結果

%Point{x: 4, y: 6}
%Person{age: 0, name: 'unknown'}
unknown
0
%Person{age: 24, name: 'tanaka'}
tanaka
24
"Alice"

成果物

以上。