ES6 auto-rewinding iterators

auto-rewind-it.js

function range(n) {
  var i = 0
  
  return { next: step }
          
  function step() {
    if (i++ < n) return { value: i }

    return i = 0, { done: '110%' }
  }
}

var ten = range(5)

for (var n of ten) console.log(n)
console.log('erase and rewind')
for (var n of ten) console.log(n) // works

$ node --harmony auto-rewind-it.js 
1
2
3
4
5
erase and rewind
1
2
3
4
5