code: function getNth (elements, target) {
    var length = elements.length
    var count = 0
    for (var index = 0; index < length; index++) {
      var element = elements[index]
      if (!element.hasOwnProperty('deleted')) {
        if (count === target) {
          return index
        }
        count++
      }
    }
    return (index + 1)
  }
docs: Return the array index of the nth content element that has _not_ been marked for deletion with `{ deleted: true }`.