The Whim Programming Language

Whim is a toy programming language. Do not use it in production.

Whim is a small language with strict runtime types. Its syntax will feel familiar if you know PHP or Hack, but Whim follows its own rules.

function greet(string $name): string {
  return 'Hello, ' . $name . '!';
}

write_line!(greet('Ada'));

Whim has reified generics, value-based arrays, classes, interfaces, enums, pattern matching, async tasks, and a large standard library. The whim command runs and formats source files, prints bytecode, and manages Git dependencies.

This book explains the language as it works now. Whim has no promise of backward compatibility. A later release may change or remove any rule in this book.

Start with Installation, then write Your First Program.