Course Hero LinkdList Solution.

course-hero-linkdlist.js

/*
input: A -> B -> C -//
output: C -> B -> A -//
*/

var LinkdList = function (item) {
   this.name = item;
   this.next = null;
  
};

// Set next item in LinkedList
LinkdList.prototype.nextItem = function (nitem) {
  var _this = this;
  if (_this.next !== null) { _this = _this.next};
  
  _this.next = new LinkdList(nitem);
  return _this.next;
};

var A = new LinkdList("a");

var B = A.nextItem("b");

var C = A.nextItem("c");

// A -> B -> C
// C -> B -> A

// Reverse Link relationship between items
LinkdList.prototype.reverseLink = function (item) {
  var ele = item;
  var currEle = item;

  while (ele.next !== null )  {
    
    if (ele.next !== null) {
          ele.next.reverse =  ele;
    } 
    
    currEle = ele.next;
    ele.next = ele.reverse || null;
    delete ele.reverse;
    ele = currEle;
  }
  
  ele.next = ele.reverse;
  delete ele.reverse;  
};