combining-the-command-pattern-with-state-pattern-in-java-script_4.js

// Private object hidden within this scope
let commands = {}

export function registerCommand(name, callback) {
  if (commands[name]) commands[name].push(callback)
  else commands[name] = [callback]
}

export function dispatch(name, action) {
  commands[name]?.forEach?.((fn) => fn?.(action))
}