1. Getting Started

Getting started in O is easy! Just follow the steps below and you’ll be ready to go!

1.1. Getting the interpreter

You can download latest release from http://github.com/phase/o/releases or clone the repository and compile it manually:

git clone https://github.com/phase/o && cd o
make all

Running the executable without any arguments will open the REPL, which you can type lines of O code into to have them interpreted.

You can also go to http://o-lang.herokuapp.com and use the always-updated-interpreter so you won’t have to recompile every update.

1.2. Let’s test it out!

Whether you’re on the online IDE or using the REPL, this Hello World program will run on both:

"Hello, World!"o

This is the simplest Hello World program in O. It pushes the string Hello, World! to the stack and outputs it with o. You will learn about why the o isn’t needed in the next section.