PoshClosure.ps1

$Adder = {
    param ([int] $x)
    return (
        {
          param ([string] $y)

          return ($x + $y)
        }.GetNewClosure()
    )
}

Set-Item -Path "Function:Adder" -Value $Adder

$add5 = Adder 5
$add10 = Adder 10

$add5.Invoke(2)
$add10.Invoke(2)