Recap - Simple Event Handler

Write a function createEventSystem that creates a simple event system with pre-registered events and triggers one based on input parameters.

Logic:

• Create an empty table to store events inside createEventSystem
• Define a register function that takes eventName and callback, storing the callback in the events table with the event name as the key
• Define a trigger function that takes eventName and arg, looks up the callback in the events table, and calls it with the argument if it exists
• Pre-register three events:
  • "double": takes a number and returns it multiplied by 2
  • "square": takes a number and returns it squared
  • "increment": takes a number and returns it plus 1
• Trigger the event specified by the eventName parameter with the value parameter
• Return the result of the triggered event, or "Event not found" if the event doesn't exist

Parameters:

• eventName (string): The name of the event to trigger
• value (number): The value to pass to the event callback

Returns:

• The result of the callback function (number), or "Event not found" if the event doesn't exist (number|string)