# LibTmux.Selection.count/2

- **Module:** LibTmux
- **Package:** libtmux
- **Language:** Elixir
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-elixir/blob/66b9b1c3f3f3186428abdfda2c76f5cf87446710/lib/libtmux/selection.ex#L177
- **Page:** https://libtmux.org/en/elixir/latest/reference/libtmux-selection-count-2/

```
count(selection, criteria \\ [])
@spec count(t(), LibTmux.Filter.input()) ::
        non_neg_integer()
```

Counts observed matching items; use size/1 for cached unfiltered size.

See the [worked example](api-examples.html#local-graph-and-filtering).

## Parameters

- `selection` (`t()`)
- `criteria` (`LibTmux.Filter.input()`)