Introduction
Getting Started
Welcome to the Juno Programming Language.
This section guides you through installing Juno, creating your first project, writing your first program, and understanding the basic development workflow.
If you're new to Juno, start with the installation guide and continue through the chapters in order.
In This Section
- Installing the Juno toolchain
- Creating a new project
- Writing your first program
- Compiling and running applications
- Understanding the project layout
After completing this chapter, you'll be ready to explore the language itself in the Language Tour.
Installation
Before writing your first Juno program, you need to install the Juno toolchain.
Requirements
The exact requirements depend on your operating system.
- Windows
- Linux
- macOS
Installing
cargo install junocc
optional language server
cargo install junolsp
Verify the Installation
After installing Juno, verify that the compiler is available:
junocc --version
If the command succeeds, you're ready to continue with the next chapter.
Hello, World!
Writing a "Hello, World!" program is a long-standing tradition when learning a new programming language. It demonstrates the minimal structure of a valid program and verifies that your development environment is working correctly.
The Program
fn main() {
puts("Hello, World!");
}
Program Structure
Every executable Juno program begins with a function named main.
fn main() {
}
When the program starts, the runtime automatically calls main(). Execution ends when this function returns.
Printing Text
The printf() built-in function writes a string to the standard output followed by a newline.
printf("Hello, World!");
The output will be:
Hello, World!
Statements
Each statement ends with a semicolon (;).
printf("Hello");
printf("World");
Omitting the semicolon results in a compilation error.
Strings
Text enclosed in double quotes (") is a string literal.
printf("Juno");
printf("Programming Language");
Strings can contain letters, numbers, punctuation, and escape sequences.
What's Next?
Now that you've written your first program, continue with the next chapter to learn how to create and organize Juno projects.
Project Structure
The project structure is not yet implemented (TODO: make pkgmanager for juno: mercur)