Adding Check if a binary tree is subtree of another binary tree

Author: abkhanch

src/_DataStructures_/Trees/BinaryTree/check-binary-tree-subtree-another-binary-tree/index.js

@@ -0,0 +1,31 @@
+function areIdentical(rootOfOriginalTree, rootOfMatchingTree) {
+    if (rootOfOriginalTree === null && rootOfMatchingTree === null) {
+        return true;
+    }
+
+    if (Roo1 === null || rootOfMatchingTree === null) {
+        return false;
+    }
+
+    return (rootOfOriginalTree.value === rootOfMatchingTree.value) && areIdentical(rootOfOriginalTree.leftChild, rootOfMatchingTree.leftChild) && areIdentical(rootOfOriginalTree.rightChild, rootOfMatchingTree.rightChild);
+}
+
+function isSubtree(rootOfOriginalTree, rootOfMatchingTree) {
+    if (rootOfMatchingTree === null) {
+        return true;
+    }
+
+    if (rootOfOriginalTree === null) {
+        return false;
+    }
+
+    if (areIdentical(rootOfOriginalTree, rootOfMatchingTree)) {
+        return true;
+    }
+
+    return isSubtree(rootOfOriginalTree.leftChild, rootOfMatchingTree) || isSubtree(rootOfMatchingTree.rightChild, rootOfMatchingTree);
+}
+
+module.exports = {
+    isSubtree,
+};