Comment by speg

I feel bad, because as I was writing a solution to this I knew why it wouldn't work and why (returning my counter variable returns the value at the end of the count) but I still couldn't come up with a fix :(

Edit: A good Google seems to suggest using JSON.stringify and JSON.parse to copy the value.

Edit 2: But even that doesn't seem to work :(

Edit 3: Got it, using a generator function. Which makes sense. I guess I'm not an expert yet! :)