# ControlNotificationStream.contains(_:)

- **Module:** ControlNotificationStream
- **Package:** libtmux-swift
- **Language:** Swift
- **Kind:** method
- **Page:** https://libtmux.org/reference/swift/controlnotificationstream-contains(_-)/

```
ControlNotificationStream.contains(_:)(search: Self.Element) -> Bool
```

Returns a Boolean value that indicates whether the asynchronous sequence contains the given element.

In this example, an asynchronous sequence called `Counter` produces `Int`
values from `1` to `10`. The `contains(_:)` method checks to see whether
the sequence produces the value `5`:

    let containsFive = await Counter(howHigh: 10)
        .contains(5)
    print(containsFive)
    // Prints "true"

- Parameter search: The element to find in the asynchronous sequence.
- Returns: `true` if the method found the element in the asynchronous
  sequence; otherwise, `false`.