問題文
A helper keeps the object returned by a chain of filtering and mapping and then begins a fresh traversal from that same object after a previous traversal finished. What do the rules say about the second attempt?
選択肢
- The rules treat the kept object as cached so it can replay elements held before once a closing step over it has run.
- The rules treat the kept object as used up and shut against a further pass through it once a closing step over it has run.
- The rules treat the kept object as reset and ready for repeated work once a closing step over it has run.
- The rules treat the kept object as still bound to its own supply and free for reuse once a closing step over it has run.