> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/s/stair-climbing_puzzle.md).

# Stair-climbing puzzle

```ruby
func step_up() {
    while (!step()) {
        step_up()
    }
}
```