# tmux.Window.Index

- **Module:** tmux.Window
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/5f808882015a975a65acc7f9da5b3ff0d5cbdc91/tmux/model.go#L106
- **Page:** https://libtmux.org/reference/go/tmux-window-index/

```
tmux.Window.Index() -> int
```

Index returns this window's index in its linked session. It returns -1 for a partial Window whose exact winlink has not been materialized.