User input may contain invalid digits, so I do not want parsing to throw. *Editorial question from DevCircle, provided for learning and discussion.*

Which type should I use for a single asynchronous result compared with ongoing events? *Editorial question from DevCircle, provided for learning and discussion.*

A non-nullable field cannot be initialized in the constructor but will be set before use. *Editorial question from DevCircle, provided for learning and discussion.*

Why can a String variable not hold null unless its type includes a question mark? *Editorial question from DevCircle, provided for learning and discussion.*

Both prevent reassignment. When does a value need to be known at compile time? *Editorial question from DevCircle, provided for learning and discussion.*