Examples

Learn JAPL through annotated, real code. Each example comes from the compiler test suite and is verified to compile and run.

Recursion

Fibonacci

Recursive functions with pattern matching and conditional expressions.

View example → ADTs

State Machine

Algebraic types modeling a traffic light with exhaustive pattern matching.

View example → Concurrency

Concurrent Counter

Lightweight processes with typed message passing and receive blocks.

View example → ADTs

Calculator

Recursive algebraic data types for expression trees with evaluation.

View example → Types

Error Handling

Result types for safe error handling without exceptions.

View example → FP

Pipes & Composition

Pipe-forward operator and higher-order functions for data transformation.

View example →