Is there a way to loop back an enumerator in Ruby? Given this piece of code:
a=[1,2,3]
a.to_enum
a.next => 1
a.next => 2
a.next => 3
a.next => 1
How can I make the next method go back to the first element when the enumerator reached the last element?
You can use Enumerable#cycle:
a = [1, 2, 3]
enum = a.cycle #=> #<Enumerator: [1, 2, 3]:cycle>
enum.next #=> 1
enum.next #=> 2
enum.next #=> 3
enum.next #=> 1
Enumerator#peek, e.g. enum = a.cycle; enum.peekpeek you can acheive the same thing by just calling next after you have consumed the output, not before.you can also use rewind Enumerator.html#rewind
a.rewind
Exactly same question I asked some time ago how-to-point-to-first-element-when-object-next-reached-the-end
