Elixir Language Behaviours Introduction
Example
Behaviours are a list of functions specifications that another module can implement. They are similar to interfaces in other languages.
Here’s an example behaviour:
defmodule Parser do
@callback parse(String.t) :: any
@callback extensions() :: [String.t]
end
And a module that implements it:
defmodule JSONParser do
@behaviour Parser
def parse(str), do: # ... parse JSON
def extensions, do: ["json"]
end
The @behaviour module attribute above indicates that this module is expected to define every function defined in the Parser module. Missing functions will result in undefined behaviour function compilation errors.
Modules can have multiple @behaviour attributes.
