Coding challenge #2

function reverseRecursive(obj) {
  return obj;
}

function reverseIterative(obj) {
  return obj;
}


/***************************/
/***************************/
/* DO NOT CHANGE DOWN HERE */
/***************************/
/***************************/


function Obj(v, next) {
  this.v = v;
  this.next = next;
}
Obj.prototype.toString = function() {
  var next = this.next ? ' -> ' + this.next.toString() : '';
  return this.v + next;
};
Obj.prototype.clone = function() {
  return new Obj(this.v, this.next && this.next.clone());
};

function arrayToObj(array) {
  var obj;
  for (var i = array.length - 1; i >= 0; i--) {
    obj = new Obj(array[i], obj);
  }
  return obj;
}



function test(array) {
  var obj = arrayToObj(array);
  console.log('Original:')
  console.log(obj && obj.toString());

  var r1 = reverseRecursive(obj && obj.clone());
  console.log('Reversed (recursive algorithm):');
  console.log(r1 && r1.toString());

  var r2 = reverseIterative(obj && obj.clone());
  console.log('Reversed (iterative algorithm):');
  console.log(r2 && r2.toString());

  console.log();
}

test([1, 2, 3, 4, 5, 6]);
test([1]);
test([]);