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Elixir Cookbook

Elixir Cookbook

By : Paulo Pereira
4.5 (2)
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Elixir Cookbook

Elixir Cookbook

4.5 (2)
By: Paulo Pereira

Overview of this book

This book is intended for users with some knowledge of the Elixir language syntax and basic data types/structures. Although this is a cookbook and no sequential reading is required, the book’s structure will allow less advanced users who follow it to be gradually exposed to some of Elixir’s features and concepts specific to functional programming. To get the most out of this book, you need to be well versed with Erlang.
Table of Contents (11 chapters)
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10
Index

Using module attributes as constants

Elixir supports the definition of module attributes using the @ syntax. There are a few reserved module attributes: @moduledoc, @doc, @behaviour, and @before_compile. We will focus on some of them in the next two recipes.

In this recipe, we will use module attributes as constants and access them inside functions.

Note

Module attributes can only be defined outside functions and can be defined more than once in a module.

How to do it…

To use module attributes as constants, follow these steps:

  1. Create a new constants.ex module and add the following code:
    defmodule Constants do
      @name "Bill"
      @age 22
    
      def function_one do
        IO.puts("#{@name} is #{@age} years old.")
      end
    
      @name "Joe"
      def function_two do
        IO.puts("#{@name} is #{@age+1} years old.")
      end
    end
  2. Start an IEx session in the same directory where you saved constants.ex:
    > iex constants.ex
    

    Tip

    Instead of starting IEx and then loading and compiling...

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