# Find parent of every leaf nodes in binary tree in node js Js program for Find parent of every leaf nodes in binary tree. Here mentioned other language solution.

``````/*
Node JS program for
Find parent of leaf nodes in binary tree
*/
// Binary Tree node
class TreeNode
{
constructor(data)
{
// Set node value
this.data = data;
this.left = null;
this.right = null;
}
}
class BinaryTree
{
constructor()
{
this.root = null;
}
//  Find the parent of leaf nodes using recursion
leafParent(node, parent)
{
if (node != null)
{
// Check that node is leaf node or not
if ((node.left == null && node.right == null))
{
if (parent == null)
{
// When one node of tree
console.log(" NULL");
}
else
{
process.stdout.write("  " + parent.data);
}
}
else
{
// Visit left subtree
this.leafParent(node.left, node);
// Visit right subtree
this.leafParent(node.right, node);
}
}
}
}

function main()
{
// Create new binary trees
var tree = new BinaryTree();
/*
34
/ \
/   \
-4     10
/ \     \
7   12    6
/   / \
4   6   8
/ \
9   1
-----------------
Constructing binary tree
*/
tree.root = new TreeNode(34);
tree.root.left = new TreeNode(-4);
tree.root.left.right = new TreeNode(12);
tree.root.left.right.left = new TreeNode(6);
tree.root.left.right.left.left = new TreeNode(9);
tree.root.left.right.left.right = new TreeNode(1);
tree.root.left.right.right = new TreeNode(8);
tree.root.left.left = new TreeNode(7);
tree.root.left.left.left = new TreeNode(4);
tree.root.right = new TreeNode(10);
tree.root.right.right = new TreeNode(6);
// Test
tree.leafParent(tree.root, null);
}
// Start program execution
main();``````

Output

``  7  6  6  12  10``

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