To simplify working with modules, Elixir provides three directives: import, alias, and require. These three module directives are lexically scoped—if defined in the module scope, they are valid for the whole module, but if defined inside a function, they are only valid inside that function.
These three directives allow the use of code defined in other modules.
Create the require_me.ex file with the following content:
defmodule RequireMe do
def foo do
IO.puts "This is foo from #{__MODULE__} module"
end
endIn the same folder, create the directives.ex file and add the following code:
defmodule Directives do
@col [1,2,3]
@name "demo"
# require directive
# alias directive module scope
alias String, as: S
# import directive module scope
import List, only: [first: 1]
def test_module_alias do
IO.puts "Name is #{S.capitalize(@name)}"
end
def test_function_alias do
# alias directive function scope
alias RequireMe, as: RM...