What would the hasBoss function be used for? My understanding is the null object pattern would handle it for you. If you want current level to do something, then just do it and let the Boss or NullBoss handle what to do in each situation
This way of handling nullable objects reminds me a special type in Functional programming called Option (or Maybe). It keeps two values: None and Some(val). While Some always keeps a real not null value and you can map it, None has nothing but it is not null.
I would also apply this pattern instead of creating null versions of objects because it is more generic and covers all nullable cases. For example, fp-ts provides such utilities as fromNullable.
Agree. This was a solution I debated whether to include in the book or not. Due to not wanting to take forever with the book, I decided to exclude it.
But I agree, there are many situations where using the option pattern works very well 👍
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