# LibTmux::WindowSelection::count

- **Module:** LibTmux
- **Package:** LibTmux
- **Language:** Perl
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-perl/blob/352715a4fa66a96eed7763b90daaa536aa2f121d/packages/core/lib/LibTmux/Selection.pm#L77
- **Inherited from:** LibTmux::Selection
- **Page:** https://libtmux.org/en/perl/latest/reference/libtmux-windowselection-count/

```
sub count($self, @criteria)
```

`count($criteria?)` returns an integer. Empty input returns zero. Validate all members before evaluating the optional criterion; count every matching occurrence, including duplicates.

## Methods

## Parameters

- `criteria`