1. 10
  1.  

  2. 1

    Interestingly, C and C++ have a mechanism that can often solve this problem: const. You can define arguments as being const, i.e. unchangeable:

    In Java, I would spell that as wordcount(ImmutableList.of(words)), and then get a runtime error when the function tries to modify the list.

    Not ideal; merely workable.