default.kt

fun workbook(wb: Workbook = HSSFWorkbook(), block: Workbook.() -> Unit = {}): Workbook {
    block(wb)
    return wb
}

fun tryItOut() {

    // use the default HSSFWorkbook
    workbook {
    }

    // use the provided XSSFWorkbook
    workbook(XSSFWorkbook()) {
    }
}