Linked list reverser

reverse-list.js

function reverseList(input, accumulator) {
  var reversed = { 
    id: input.id, 
    next: accumulator || null 
  };
  return input.next 
    ? reverseList(input.next, reversed) 
    : reversed;
}

var list = { 
  id: 'one', 
  next: { 
    id: 'two', 
    next: { 
      id: 'three', 
      next: null 
    } 
  } 
};

reverseList(list);