Book Image

Elixir Cookbook

By : Paulo Pereira
Book Image

Elixir Cookbook

By: Paulo Pereira

Overview of this book

Table of Contents (16 chapters)
Elixir Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Adding and subtracting lists


Lists are widely used in functional programming languages, and Elixir is no exception.

Although lists might resemble other languages' arrays, they actually behave more like single-linked lists. Operations with lists are quite common, so in this recipe, we will show you how to add two lists or subtract one list from another.

Getting ready

We will use IEx for this recipe, so start a new session by typing iex in your console.

How to do it…

To add lists, we will use the ++ operator. The steps are as follows:

  1. Create a list named list_one:

    iex(1)> list_one = [1, 3, 5]
    [1, 3, 5]
    
  2. Create a list named list_two:

    iex(2)> list_two = [2, 4, 6, 5]
    [2, 4, 6, 5]
    
  3. Add list_one to list_two:

    iex(3)> list_one ++ list_two
    [1, 3, 5, 2, 4, 6, 5]
    
  4. Add list_two to list_one:

    iex(4)> list_two ++ list_one
    [2, 4, 6, 5, 1, 3, 5]
    

To subtract lists, we will be using the -- operator:

  1. Create a list named list_three:

    iex(5)> list_three = [1, 2, 3, 4, 5, 7, 8, 9]
    [1, 2, 3, 4, 5, 7, 8, 9]
    
  2. Create...