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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
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<script id="jsbin-javascript">
/*jshint esnext: true */

"use strict";

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Node = function Node(element) {
    _classCallCheck(this, Node);

    this.element = element;
    this.next = null;
};

var LinkedList = (function () {
    function LinkedList() {
        _classCallCheck(this, LinkedList);

        this.head = null;
        this.size = 0;
    }

    // adds an element at the end of list

    _createClass(LinkedList, [{
        key: "add",
        value: function add(element) {
            var node = new Node(element);
            var current = undefined;

            // if list is Empty add the element and make it head
            if (this.head == null) this.head = node;else {
                current = this.head;

                // iterate to the end of the list
                while (current.next) {
                    current = current.next;
                }

                // add node
                current.next = node;
            }
            this.size++;
        }
    }, {
        key: "reverse",
        value: function reverse() {
            var prev = undefined,
                next = null;
            var curr = this.head;

            while (curr) {
                next = curr.next;
                curr.next = prev;
                prev = curr;
                curr = next;
            }
            this.head = prev;
        }
    }, {
        key: "printList",
        value: function printList() {
            var curr = this.head;
            var str = "";

            while (curr) {
                str += curr.element + " ";
                curr = curr.next;
            }

            console.log(str);
        }
    }]);

    return LinkedList;
})();

var ll = new LinkedList();
ll.add(10);
ll.add(20);
ll.add(30);
ll.add(40);
ll.printList();
ll.reverse();
ll.printList();
</script>


<script id="jsbin-source-javascript" type="text/javascript">/*jshint esnext: true */

class Node {
    constructor(element){
        this.element = element;
        this.next = null;
    }
}

class LinkedList {
    constructor() {
        this.head = null;
        this.size = 0;
    }

    // adds an element at the end of list
    add(element) {
        let node = new Node(element);
        let current;

        // if list is Empty add the element and make it head
        if (this.head == null) this.head = node;
        else {
            current = this.head;

            // iterate to the end of the list
            while (current.next) {
                current = current.next;
            }

            // add node
            current.next = node;
        }
        this.size++;
    }

    reverse() {
      let prev, next = null;
      let curr = this.head;

      while(curr) {
        next = curr.next;
        curr.next = prev;
        prev = curr;
        curr = next;
      }
      this.head = prev;
    }

    printList() {
        let curr = this.head;
        let str = "";

        while (curr) {
            str += curr.element + " ";
            curr = curr.next;
        }

        console.log(str);
    }
}


let ll = new LinkedList();
ll.add(10);
ll.add(20);
ll.add(30);
ll.add(40);
ll.printList();
ll.reverse();
ll.printList();

</script></body>
</html>