Command.js

function Command(name, execute) {
  this.name = name
  this.execute = execute
}

Command.prototype.toString = function() {
  return this.name
}

const createCommandHub = function() {
  const commands = {}
  return {
    add(command) {
      commands[command.name] = command
    },
    execute(command, ...args) {
      return commands[command].execute(...args)
    },
  }
}

const cmds = createCommandHub()
const talkCommand = new Command('talk', function(wordsToSay) {
  console.log(wordsToSay)
})
const destroyEverythingCommand = new Command('destroyEverything', function() {
  throw new Error('Destroying everything')
})

cmds.add(talkCommand)
cmds.add(destroyEverythingCommand)
cmds.execute(talkCommand, 'Is talking a talent?')