Your First Program

Create a project:

thor new hello
cd hello

Then replace src/main.zp with:

fun main() Int {
    println("Hello, Zap!");
    return 0;
}

Build and run it:

thor run

The program prints:

Hello, Zap!

main is the executable entry point. Its Int result becomes the process exit code. println is already in scope through the prelude.

Functions that do not return a value omit the return type:

fun announce(message: String) {
    println(message);
}

fun main() Int {
    announce("compiled and running");
    return 0;
}

Statements end with semicolons. Blocks use braces. Zap does not require a package declaration for a single-file program. Thor reads the project’s thor.toml; its default entry point is src/main.zp.

Next, read Variables.