4 ms·

You can intern strings without preventing mutability using the copy-on-write principle. PHP does it.

• recursive 5y ago
  If you copy before you write, you're not mutating, you're making a new thing. e.g. This pseudo code must stand for mutation to be present. a = ... b = a mutate(a) /* b now mirrors a */
  • TazeTSchnitzel 5y ago
    A language runtime can make that work if it wants to. High-level semantics don't need to constrain the implementation.
    • deleted 5y ago
      [deleted]