diff --git a/Data Structures/bstLookup.js b/Data Structures/bstLookup.js
new file mode 100644
index 0000000..e5d1d0f
--- /dev/null
+++ b/Data Structures/bstLookup.js	
@@ -0,0 +1,26 @@
+// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/check-if-an-element-is-present-in-a-binary-search-tree
+
+var displayTree = (tree) => console.log(JSON.stringify(tree, null, 2));
+function Node(value) {
+  this.value = value;
+  this.left = null;
+  this.right = null;
+}
+function BinarySearchTree() {
+  this.root = null;
+  // Only change code below this line
+  this.isPresent = (item) => {
+    let node = this.root;
+    while (node !== null) {
+      if (node.value === item) {
+        return true;
+      } else if (node.value < item) {
+        node = node.right;
+      } else {
+        node = node.left;
+      }
+    }
+    return false;
+  };
+  // Only change code above this line
+}