Create 1325-delete-leaves-with-a-given-value.js

Author: aadil42

Diff for: javascript/1325-delete-leaves-with-a-given-value.js

@@ -0,0 +1,30 @@
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * DFS | PostOrder traversal
+ * Time O(n) | Space O(n)
+ * https://leetcode.com/problems/delete-leaves-with-a-given-value
+ * @param {TreeNode} root
+ * @param {number} target
+ * @return {TreeNode}
+ */
+var removeLeafNodes = function(root, target) {
+    
+    const dfs = (node) => {
+        if(!node) return null;
+        node.left = dfs(node.left);
+        node.right = dfs(node.right);
+        if(!node.left && !node.right) {
+            if(node.val === target) return null;
+        }
+        return node;
+    }
+
+    return dfs(root);
+};