Pretty printer with fields and delimiter param

pretty_print_with_fields.scala

/**
    * Iterates through fields and prints each one with its name and value
    *
    * Delimiter parameter seperates fields.  Defaults to line seperator
    */
  def toStringPrettyPrint(delimiter: String = "\n"): String = {
    val fields = this.getClass.getDeclaredFields.foldLeft(new TreeMap[String,Any]) { (acc,field) =>
      field.setAccessible(true)
      acc + (field.getName -> field.get(this))
    }
    s"${fields.mkString(delimiter)}"
  }