root.js

//ROOT Tree:
{
  this.value = 15;
  this.left = BST(10);
  this.right = null;
  this.parent = {node: BST(20), side: 'left'};
}
//root.height() => 2;
//root.balanceFactor() => 2;

//PIVOT Tree (left of root):
{
  this.value = 10;
  this.left = BST(7);
  this.right = null;
  this.parent = {node: BST(15), side: 'left'};
}
//pivot.height() => 1;
//pivot.balanceFactor() => 1;

//PARENT Tree (of root):
{
  this.value = 20;
  this.left = BST(15);
  this.right = BST(25);
  this.parent = {node: null, side: ''}
}
//parent.height() => 3;
//parent.balanceFactor() => 2;