> 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/n/nested_function.md).

# Nested function

```ruby
func make_list(separator = ') ') {

    var count = 1
    func make_item(item) {
        [count++, separator, item].join
    }

    <first second third>.map(make_item).join("\n")
}

say make_list('. ')
```

#### Output:

```
1. first
2. second
3. third
```