Hello World!

Let’s start by a classical hello world example! Open the project directory in your favorite text editor and add the following code to src/main.clio file.

Above code is the simplest form of writing a hello world program in Clio, let’s break it down a little bit:

  1. On the first line, we’ve defined a function named main. Every runnable Clio program needs a main function and this function needs to be exported. If you don’t know what that means, don’t worry, you’ll learn about it soon.

  2. On the second line, we call console.log function, passing "Hello world!" to it. This function prints the arguments passed to either to your terminal, or to the browser’s console.

Running this program should show Hello world! in the console. Go on and try it out by running clio run in your project’s root folder. Congrats on writing and running your first Clio program!