Hello World!

This is Hello World program in redy. Try pasting it to your main.ry.

fn main() {
  println#("Hello World from redy!")
}

To run this program, you need to "compile" the program first, so run the command below, then the executable binary will be generated in ./out/

redy main.ry
# Compiling... : main.ry
# Completed!   : main.ry

Now let's run our first redy program!

./out/main
# Hello World from redy!

When you run the executable, it prints the string "Hello World" as standard output, as we can see in the console.

How the Hello World Program Works

What does that hello world program mean is very simple to understand, let's go through it line by line.

fn main() {

The first line means that "We will declare function(fn) named main", and "Start defining the content of the function({)".
function in programming means typically something like a collection of processes.

println#("Hello, World from redy!")

The next line is also simple, calling function named println#() with argument "Hello, World from redy!". println#() is provided function that prints line to the console, and we called it with single string argument. the characters surrounded by double quotation are considered as literal string, a set of the characters that can be handled at a time.

Note that println#() is not a function actually, but it's a bit complicated to explain why now, so we'll come back to that later, just consider it as a function.

}

The last line is the simplest one, that means "End defining this function", and the program ends here, so we created the functional program in only 3 lines!