4 ms·

Far more interesting (IMO), would be a constrains based library based on predicates (iterable, hashable, arithmatic-able?)

• nudded 17y ago
  In ruby you can ensure this by calling responds_to?(:method). So for example to see if some object is iterable, you just check if it responds to each. obj.responds_to?(:each)
  • jrockway 17y ago
    That doesn't guarantee that "each" is actually the right "each".