How to #rewind the internal position under #each?

Question

I'm trying to write a code where the enumeration sequence is rewinded to the beginning.

I think rewind is appropriate for this application, but I'm not sure how to implement it under an each iterator passing to a block? In the Ruby-Docs example, next is used to move the internal position by one at a time. With a block, it would move autonomously.

There's not many good examples online for this specifically. My workaround at the moment is to nest an iterator under a loop and using break under the iterator. When the iterator breaks, the loop resets the enumeration sequence.

Is there a better way—as I'm sure there is—of doing this?

Answer 1

Use the Enumerator#rewind method from Ruby core class libarary.

Rewinds the enumeration sequence to the beginning.If the enclosed object responds to a “rewind” method, it is called.

a = [1,2,3,4]
enum= a.each
enum  # => #<Enumerator: [1, 2, 3, 4]:each>
enum.next # => 1
enum.next  # => 2
enum.rewind # => #<Enumerator: [1, 2, 3, 4]:each>
enum.next # => 1