type
  PortState = enum Open, Closed
  PortItem = object
    port: int
    state: PortState

# A simple container for PortItems
type
  PortList = seq[PortItem]

# Add a new port to the list
proc addPort(portList: var PortList; newPort: PortItem) =
  portList.add(newPort)

# Modify an existing port in the list
proc modifyPort(portList: var PortList; portNum: int; newState: PortState) =
  for i in 0..<portList.len:
    if portList[i].port == portNum:
      portList[i].state = newState
      return
  echo "Port not found."

# Delete a port from the list
proc deletePort(portList: var PortList; portNum: int) =
  for i in 0..<portList.len:
    if portList[i].port == portNum:
      portList.del(i)
      return
  echo "Port not found."

# Sample usage
var ports: PortList
addPort(ports, PortItem(port: 80, state: PortState.Open))
addPort(ports, PortItem(port: 443, state: PortState.Closed))
echo ports

modifyPort(ports, 80, PortState.Closed)
echo ports

deletePort(ports, 443)
echo ports