If it anything like C#, .shuffled needs to return a new object and has some expense incurred to achieve, so is a function/method, but .first is immediately avai

If it anything like C#, .shuffled needs to return a new object and has some expense incurred to achieve, so is a function/method, but .first is immediately available, requires only a trivial amount of calculation and does not return a new array/list, so is a property.