# 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/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/model.go#L106
- **Page:** https://libtmux.org/en/go/latest/reference/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.