> 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/i/increment_a_numerical_string.md).

# Increment a numerical string

```ruby
say '1234'.inc    #=> '1235'
say '99'.inc      #=> '100'
```