The GetOrAddComponent<T> method is a generic method of the GameObject class that attempts to retrieve a component of type T from the GameObject. If the component does not exist, it adds a new component of type T to the GameObject. The method also allows you to specify whether the component should be enabled upon creation.
To use the GetOrAddComponent<T> method, call it on an instance of GameObject, specifying the type of component you want to retrieve or add. Pass a boolean value to the startEnabled parameter to determine if the component should be enabled when added.
// Example of using GetOrAddComponent // Assume 'gameObject' is an instance of GameObject var myComponent = gameObject.GetOrAddComponent<MyComponent>(true); // 'myComponent' will be the existing component if it exists, // or a new component of type MyComponent if it doesn't.