Clojure from zero to hero (0) - creating a Pedestal app
Jun 18, 2019
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Install Leiningen and create your first app
Clojure
Clojure is a dynamic, general-purpose programming language, combining the approachability and interactive development of a scripting language with an efficient and robust infrastructure for multithreaded programming.
Leiningen
As these folks are saying on their website: If you come from the Java world, Leiningen could be thought of as “Maven meets Ant without the pain”. For Ruby and Python folks, Leiningen combines RubyGems/Bundler/Rake and pip/Fabric in a single tool.
Basically is a dependency management tool with built in capabilities to build the Clojure project and to generate Clojure apps from templates.
Install Leiningen
Ubuntu 19.04
sudo apt install leiningenHomebrew
brew install leiningen
If you have a different distro or a different operating system, go to Leiningen’s instalation instructions and you should find instructions on how to do it.
Pedestal
Pedestal is a set of libraries that we use to build services and applications. It runs in the back end and can serve up whole HTML pages or handle API requests.
First Clojure project
Create a new web API from a template
lein new pedestal-service pedestal-api
Go to the new location and tell Leiningen to download and install all the dependencies for the project
cd pedestal-api
lein deps
Run the application using Leiningen
lein run
Navigate to http://localhost:8080 and you should get the very popular greeting “Hello world”.
Don’t forget to version your code
I am using git to version my code. I presume you already know what git is and what code versioning means and you also have git installed. Therefore I would urge you to start tracking your code:
git add .
git commit -m "Initial commit, created a default project."
Grab a drink to celebrate
Done, you have a running web API using Clojure, Pedestal and Leiningen.
Tags: programming , clojure