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When to use a method vs a handler in Go

A Method is a skill an object can do, while a Handler is the specific reaction that triggers that skill when an event occurs.

Method ===> Focuses on the "what" (the skill)​

const chef = {
  // This is a METHOD
  chop(ingredient) {
    console.log(`Chef is skillfully dicing the ${ingredient}.`);
  }
};

Handler ===> Focuses on the "when" (the event)​

// This is a HANDLER
function onNewOrderReceived(event) {
  const ingredient = event.orderItem; // e.g., "Onion"
  
  // The handler triggers the method
  chef.chop(ingredient); 
  
  console.log("Order handled!");
}

// Registering the handler to the "Order System"
orderSystem.addEventListener("ticket_arrived", onNewOrderReceived);