mapNotNull
Applies transform once per element in iteration order and retains only non-null results.
Creates a new list without changing the source. Accepted results retain their order. Exceptions from iteration or the callback propagate to the caller. The inline callback supports non-local returns.
Receiver
elements to visit in their iteration order.
Return
a new read-only list of non-null results; empty if none are produced.
Parameters
transform
transformation returning a value to include, or null to omit it.