4 ms·

Which language has both a "None" and "null"?

• efficax 5y ago
  javascript, at least, has "undefined" and "null", an infuriating duality of falsiness. PHP also has a notion of not being set as well as being set but null.
  • remram 5y ago
    JavaScript is what we are talking about in this thread, making the point that JavaScript is similar to JavaScript does not help ;-)
    • deleted 5y ago
      [deleted]
• mynameisash 5y ago
  Scala, as I recall. It encourages using Options (Some/None), but since it runs on the JVM and will often interop with Java libraries, you can also have nulls. Not exactly a language design, but an unfortunate reality.
  • remram 5y ago
    Oh no! Does it not have a type for NonNull references, like Rust does?
    • kaba0 5y ago
      Since Scala 3, it can have total static analysis where nulls become a separate type that has to be explicitly declared in type signatures. So, yes.