diff --git a/src/data-structures/binary-tree/binary-tree.ts b/src/data-structures/binary-tree/binary-tree.ts
index de5a89e..358bd9d 100644
--- a/src/data-structures/binary-tree/binary-tree.ts
+++ b/src/data-structures/binary-tree/binary-tree.ts
@@ -288,7 +288,7 @@ export class BinaryTree<
    */
   ensureNode(
     keyOrNodeOrEntryOrRawElement: R | BTNKeyOrNodeOrEntry<K, V, NODE>,
-    iterationType: IterationType = 'ITERATIVE'
+    iterationType: IterationType = this.iterationType
   ): OptBTNOrNull<NODE> {
     if (keyOrNodeOrEntryOrRawElement === null) return null;
     if (keyOrNodeOrEntryOrRawElement === undefined) return;
@@ -800,7 +800,7 @@ export class BinaryTree<
    * It has a default value of `'ITERATIVE'`.
    * @returns a value of type NODE, null, or undefined.
    */
-  getNodeByKey(key: K, iterationType: IterationType = 'ITERATIVE'): OptBTNOrNull<NODE> {
+  getNodeByKey(key: K, iterationType: IterationType = this.iterationType): OptBTNOrNull<NODE> {
     return this.getNode(key, this._DEFAULT_CALLBACK, this.root, iterationType);
   }
 
@@ -1417,7 +1417,7 @@ export class BinaryTree<
     callback: C = this._DEFAULT_CALLBACK as C,
     pattern: DFSOrderPattern = 'IN',
     beginRoot: R | BTNKeyOrNodeOrEntry<K, V, NODE> = this.root,
-    iterationType: IterationType = 'ITERATIVE',
+    iterationType: IterationType = this.iterationType,
     includeNull = false
   ): ReturnType<C>[] {
     beginRoot = this.ensureNode(beginRoot);
diff --git a/src/data-structures/binary-tree/bst.ts b/src/data-structures/binary-tree/bst.ts
index 2805a89..5788820 100644
--- a/src/data-structures/binary-tree/bst.ts
+++ b/src/data-structures/binary-tree/bst.ts
@@ -195,7 +195,7 @@ export class BST<
    */
   override ensureNode(
     keyOrNodeOrEntryOrRawElement: R | BTNKeyOrNodeOrEntry<K, V, NODE>,
-    iterationType: IterationType = 'ITERATIVE'
+    iterationType: IterationType = this.iterationType
   ): OptBSTN<NODE> {
     return super.ensureNode(keyOrNodeOrEntryOrRawElement, iterationType) ?? undefined;
   }
@@ -522,7 +522,7 @@ export class BST<
    * It has a default value of `'ITERATIVE'`.
    * @returns The method is returning a NODE object or undefined.
    */
-  override getNodeByKey(key: K, iterationType: IterationType = 'ITERATIVE'): OptBSTN<NODE> {
+  override getNodeByKey(key: K, iterationType: IterationType = this.iterationType): OptBSTN<NODE> {
     return this.getNode(key, this._DEFAULT_CALLBACK, this.root, iterationType);
   }
 
@@ -555,7 +555,7 @@ export class BST<
     callback: C = this._DEFAULT_CALLBACK as C,
     pattern: DFSOrderPattern = 'IN',
     beginRoot: R | BTNKeyOrNodeOrEntry<K, V, NODE> = this.root,
-    iterationType: IterationType = 'ITERATIVE'
+    iterationType: IterationType = this.iterationType
   ): ReturnType<C>[] {
     return super.dfs(callback, pattern, beginRoot, iterationType, false);
   }