get uncle Check if current node has parent if !thisparent return undefined; Check if current node has grand-parent if !thisparentparent return undefined; Check i

/**

• Returns the uncle node of the current node.

• @returns {Node} The uncle node of the current node, or undefined if there is no uncle. */ get uncle() { // Check if current node has a parent. if (!this.parent) { return undefined; }

  // Check if current node has a grand-parent. if (!this.parent.parent) { return undefined; }

  // Check if the grand-parent has two children. if (!this.parent.parent.left || !this.parent.parent.right) { return undefined; }

  // So for now we know that the current node has a grand-parent and this // grand-parent has two children. Let's find out who the uncle is. if (this.nodeComparator.equal(this.parent, this.parent.parent.left)) { // The right child of the grand-parent is the uncle. return this.parent.parent.right; }

  // The left child of the grand-parent is the uncle. return this.parent.parent.left;