# Worked examples

Complete programs built from what the track covered. Each is one file to
save and run, with the output it prints.

| Example | Uses |
|---------|------|
| [Countdown](countdown.md) | `while` with `decr!` and an `else:` peer |
| [Script entry point](script-main.md) | `@entry-point` for the function that runs only as a program |
| [Fibonacci](fibonacci.md) | recursion, `lru_cache` with `@demand`, `@let`, named `let`, `while` |
| [Point class](point-class.md) | `@dataclass` on `class`, `each`, a property with a setter |
| [Property accessors](property-accessors.md) | `@property`, `.setter`, `.deleter`, `del!` |

```{toctree}
:maxdepth: 1
:hidden:

countdown
script-main
fibonacci
point-class
property-accessors
```