> 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/sattolo_cycle.md).

# Sattolo cycle

Modifies the array in-place:

```ruby
func sattolo_cycle(arr) {
    for i in (arr.len ^.. 1) {
        arr.swap(i, pick(^i))
    }
}
```