One operation I frequently perform is use a powershell pipeline to filter out a large set of data.  Typically I don't care what is in the result but rather is there actually anything left in the pipeline.  I can't find a good powershell built-in to perform this task so I use the following filter.

function Test-Any() {
    begin {
        $any = $false
    }
    process {
        $any = $true
    }
    end {
        $any
    }
}

Now I can easily write

$any = Some-Command | ?{ Some-Condition } | test-any