The first program

The program

Write this text into hello.rgr:

class Main {
    sfn main:void () {
        def name "world"
        print ("hello " + name)
    }
}

The program has one class. The static function main is the entry point. The operator def declares a variable, and the compiler finds the type of the variable from the value.

Compile the program

rgrc hello.rgr -l=es6 -d=./bin -o=hello.js
node bin/hello.js

The program writes hello world.

The same program for other targets

rgrc hello.rgr -l=go -d=./bin -o=hello.go
rgrc hello.rgr -l=python -d=./bin -o=hello.py
rgrc hello.rgr -l=rust -d=./bin -o=hello.rs

The operator reference shows the generated code of each operator for each target language.

The next step

• Program structure describes classes and functions.
• Types describes the type system.
• Ownership and lifetime describes who keeps an object alive, which C++, Swift and Rust need.
• Target languages describes what each target supports.