# LibTmux::OptionValue#index

- **Module:** LibTmux
- **Package:** libtmux
- **Language:** Ruby
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ruby/blob/da7b6191b9439e3c84fa1c9eeaa9168263ee7af4/gems/libtmux/lib/libtmux/options.rb#L6
- **Page:** https://libtmux.org/en/ruby/v0.1.1/reference/libtmux-optionvalue-index/

```
def index: () -> ::Integer?
```

Returns the value of attribute index.

Behavior contract: Option values.