Ayuda de LibreOffice 25.2
Una función es un bloque de código que se ejecuta cuando se le llama. A menudo, a las funciones se las llama expresiones.
You can pass data, known as parameters or arguments, into a function. You may pass a parameter by value or by reference. When by reference, modifications applied to the parameter in the function will be sent back to the calling code.
A function usually returns data as a result.
  
  [Private | Public] Function Name[char] (argument1 [As Type][, argument2[char][,...]]) [As typename]
          instrucciones
      [Exit Function]
          instrucciones
  End Function
scope: Function default scope is Public. A Private scope denotes a module internal routine, not intended to be used from other modules.
name: Name of the subroutine to contain the value returned by the function.
argumentos: los parámetros que se pasarán a la subrutina.
Sub ExampleExit
Dim sReturn As String
Dim sListArray(10) As String
Dim siStep As Single
    For siPaso = 0 to 10 ' Rellenar matriz con datos de prueba
        sListArray(siStep) = chr$(siStep + 65)
        MsgBox sListArray(siStep)
    Next siStep
    sReturn = LinSearch(sListArray(), "B")
    Print sReturn
End Sub
 
Function LinSearch( sList(), sItem As String ) As Integer
Dim iCount As Integer
' BuscaLin busca en MatrizTexto:sLista() una EntradaTexto:
' El valor de retorno es el índice de la entrada o 0 (Nulo)
    For iCount=1 To Ubound( sList() )
        If sList( iCount ) = sItem Then
            Exit For ' sItem encontrado
        End If
    Next iCount
    If iCount = Ubound( sList() ) Then iCount = 0
    LinSearch = iCount
End Function