old_contents: class Node_Tree {
    constructor(val) {
      this.val = val;
      this.parent = null;
      this.children = [];
    }
  }
  
  class Node_Trie {
    constructor(val) {
      /*
      ** The node stores a single character as its value.
      ** Child nodes are stored in an object instead of an array for constant-time lookup
      ** because every child node will have a unique value/letter
      */
      this.val = val;
      this.children = {};
    }
  }
  
  class Node_BST {
    constructor(key, val) {
      /*
      ** Key should be an integer, for proper placement of the node in a Binary Search Tree
      */
      this.key    = key;
      this.val    = val;
      this.parent = null;
      this.left   = null;
      this.right  = null;
    }
  }
  
  
  export { Node_Tree, Node_Trie, Node_BST };
new_contents: class Node_Tree {
    constructor(val) {
      this.val = val;
      this.parent = null;
      this.children = [];
    }
  }
  
  class Node_Trie {
    constructor(val) {
      /*
      ** The node stores a single character as its value.
      ** Child nodes are stored in an object instead of an array for constant-time lookup
      ** because every child node will have a unique value/letter
      */
      this.val = val;
      this.children = {};
    }
  }
  
  class Node_BST {
    constructor(key, val) {
      /*
      ** Key should be an integer, for proper placement of the node in a Binary Search Tree
      */
      this.key    = key;
      this.val    = val;
      this.parent = null;
      this.left   = null;
      this.right  = null;
    }
  }
  
  class Node_LinkedList {
    constructor(val) {
      /*
      ** A block of information stored in a doubly linked list.
      ** Stores references to the next and previous nodes.
      */
      this.val  = val;
      this.next = null;
      this.prev = null;
    }
  }
  
  
  export { Node_Tree, Node_Trie, Node_BST };
subject: Add linked list node to utils