client.ts

// The Command Pattern Use Case Example. A smart light Switch

import Light from './light'
import Switch from './switch'
import SwitchOnCommand from './switch-on-command'
import SwitchOffCommand from './switch-off-command'

// Create a receiver
const LIGHT = new Light()

// Create Commands
const SWITCH_ON = new SwitchOnCommand(LIGHT)
const SWITCH_OFF = new SwitchOffCommand(LIGHT)

// Register the commands with the invoker
const SWITCH = new Switch()
SWITCH.register('ON', SWITCH_ON)
SWITCH.register('OFF', SWITCH_OFF)

// Execute the commands that are registered on the Invoker
SWITCH.execute('ON')
SWITCH.execute('OFF')
SWITCH.execute('ON')
SWITCH.execute('OFF')

// show history
SWITCH.showHistory()

// replay last two executed commands
SWITCH.replayLast(2)