case example.ps1

function Select-Things {
  [CmdletBinding()]
  param(
    [Parameter(Position = 0, Mandatory)]
    [string[]]
    $Param1
  )
  if ($Param1 -contains "one") {
    switch ($Param1) {
      "two" {
        $Param1 -match "two"
      }
      "three" {
        $Param1 -replace "three", "infinity"
      }
      default {
        $Param1 | Where-Object {$_ -like '*ab*'}
        throw "a ball"
      }
    }
  }
  else {
    $PSCmdlet.ThrowTerminatingError("Requisite string not found.")
  }
}