Your first Opa application

As a first example, here is the most simple program in Opa:

jlog("hello Opa!")

Compile and run it:

$ opa hello.opa -o hello.js
$ ./hello.js

Note

We can type opa hello.opa -- to compile and run the code in a single line.

The code does nothing but prints hello Opa on your screen. If you can see this message, it means Opa is working properly on your machine.