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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 tasks to perform multiple concurrent computations


In this recipe, we will build a simple geolocation app that receives a list of IP addresses and outputs the country where the IP is registered. We will use Elixir's Task module to spawn one process per IP address in the list. The determination of the location will be performed concurrently.

The Task module in Elixir provides a simple abstraction for the use of processes with the purpose of performing one action during their life cycle. Normally, tasks are used when there is no need to perform communication between processes, and are a very powerful tool to help parallelize computation.

Getting ready

We will generate a Mix application, add the geolix application as a dependency, and also download a free IP database and configure the application to use it. We will also create two functions to geolocate the IPs: one sequential and another concurrent.

Let's get started:

  1. Generate a Mix application:

    > mix new geolocation_with_tasks --sup
    *...

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