diff --git a/src/data-structures/heap/heap.ts b/src/data-structures/heap/heap.ts
index f41ed7a..e11d95f 100644
--- a/src/data-structures/heap/heap.ts
+++ b/src/data-structures/heap/heap.ts
@@ -207,12 +207,7 @@ export class Heap<E = any, R = any> extends IterableElementBase<E, R, Heap<E, R>
       if (comparator) this._comparator = comparator;
     }
 
-    if (elements) {
-      for (const el of elements) {
-        if (this.toElementFn) this.add(this.toElementFn(el as R));
-        else this.add(el as E);
-      }
-    }
+    this.addMany(elements);
   }
 
   protected _elements: E[] = [];
@@ -254,14 +249,24 @@ export class Heap<E = any, R = any> extends IterableElementBase<E, R, Heap<E, R>
    * Time Complexity: O(log n)
    * Space Complexity: O(1)
    *
-   * Insert an element into the heap and maintain the heap properties.
-   * @param element - The element to be inserted.
    */
   add(element: E): boolean {
-    this._elements.push(element);
+    this._elements.push(element as E);
     return this._bubbleUp(this.elements.length - 1);
   }
 
+  addMany(elements: Iterable<E> | Iterable<R>): boolean[] {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this._toElementFn) {
+        ans.push(this.add(this._toElementFn(el as R)));
+        continue;
+      }
+      ans.push(this.add(el as E));
+    }
+    return ans;
+  }
+
   /**
    * Time Complexity: O(log n)
    * Space Complexity: O(1)
diff --git a/src/data-structures/linked-list/doubly-linked-list.ts b/src/data-structures/linked-list/doubly-linked-list.ts
index 93b2387..0110125 100644
--- a/src/data-structures/linked-list/doubly-linked-list.ts
+++ b/src/data-structures/linked-list/doubly-linked-list.ts
@@ -524,18 +524,15 @@ export class DoublyLinkedList<E = any, R = any> extends IterableElementBase<E, R
    * `DoublyLinkedListOptions<E, R>`. It is an optional parameter that allows you to pass additional
    * configuration options to customize the behavior of the DoublyLinkedList.
    */
-  constructor(elements: Iterable<E> | Iterable<R> = [], options?: DoublyLinkedListOptions<E, R>) {
+  constructor(
+    elements: Iterable<E> | Iterable<R> | Iterable<DoublyLinkedListNode<E>> = [],
+    options?: DoublyLinkedListOptions<E, R>
+  ) {
     super(options);
     this._head = undefined;
     this._tail = undefined;
     this._size = 0;
-    if (elements) {
-      for (const el of elements) {
-        if (this.toElementFn) {
-          this.push(this.toElementFn(el as R));
-        } else this.push(el as E);
-      }
-    }
+    this.pushMany(elements);
   }
 
   protected _head: DoublyLinkedListNode<E> | undefined;
@@ -700,6 +697,30 @@ export class DoublyLinkedList<E = any, R = any> extends IterableElementBase<E, R
     return true;
   }
 
+  pushMany(elements: Iterable<E> | Iterable<R> | Iterable<DoublyLinkedListNode<E>>) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) {
+        ans.push(this.push(this.toElementFn(el as R)));
+        continue;
+      }
+      ans.push(this.push(el as E | DoublyLinkedListNode<E>));
+    }
+    return ans;
+  }
+
+  unshiftMany(elements: Iterable<E> | Iterable<R> | Iterable<DoublyLinkedListNode<E>>) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) {
+        ans.push(this.unshift(this.toElementFn(el as R)));
+        continue;
+      }
+      ans.push(this.unshift(el as E | DoublyLinkedListNode<E>));
+    }
+    return ans;
+  }
+
   /**
    * Time Complexity: O(n)
    * Space Complexity: O(1)
diff --git a/src/data-structures/linked-list/singly-linked-list.ts b/src/data-structures/linked-list/singly-linked-list.ts
index 53954dc..a6d4b7e 100644
--- a/src/data-structures/linked-list/singly-linked-list.ts
+++ b/src/data-structures/linked-list/singly-linked-list.ts
@@ -60,17 +60,12 @@ export class SinglyLinkedListNode<E = any> {
 }
 
 export class SinglyLinkedList<E = any, R = any> extends IterableElementBase<E, R, SinglyLinkedList<E, R>> {
-  constructor(elements: Iterable<E> | Iterable<R> = [], options?: SinglyLinkedListOptions<E, R>) {
+  constructor(
+    elements: Iterable<E> | Iterable<R> | Iterable<SinglyLinkedListNode<E>> = [],
+    options?: SinglyLinkedListOptions<E, R>
+  ) {
     super(options);
-    if (elements) {
-      for (const el of elements) {
-        if (this.toElementFn) {
-          this.push(this.toElementFn(el as R));
-        } else {
-          this.push(el as E);
-        }
-      }
-    }
+    this.pushMany(elements);
   }
 
   protected _head: SinglyLinkedListNode<E> | undefined;
@@ -211,6 +206,30 @@ export class SinglyLinkedList<E = any, R = any> extends IterableElementBase<E, R
     return true;
   }
 
+  pushMany(elements: Iterable<E> | Iterable<R> | Iterable<SinglyLinkedListNode<E>>) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) {
+        ans.push(this.push(this.toElementFn(el as R)));
+        continue;
+      }
+      ans.push(this.push(el as E | SinglyLinkedListNode<E>));
+    }
+    return ans;
+  }
+
+  unshiftMany(elements: Iterable<E> | Iterable<R> | Iterable<SinglyLinkedListNode<E>>) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) {
+        ans.push(this.unshift(this.toElementFn(el as R)));
+        continue;
+      }
+      ans.push(this.unshift(el as E | SinglyLinkedListNode<E>));
+    }
+    return ans;
+  }
+
   /**
    * Time Complexity: O(n)
    * Space Complexity: O(1)
diff --git a/src/data-structures/queue/deque.ts b/src/data-structures/queue/deque.ts
index f922959..037ef6b 100644
--- a/src/data-structures/queue/deque.ts
+++ b/src/data-structures/queue/deque.ts
@@ -53,14 +53,7 @@ export class Deque<E = any, R = any> extends IterableElementBase<E, R, Deque<E,
     const needBucketNum = calcMinUnitsRequired(_size, this._bucketSize);
     this._bucketFirst = this._bucketLast = (this._bucketCount >> 1) - (needBucketNum >> 1);
     this._firstInBucket = this._lastInBucket = (this._bucketSize - (_size % this._bucketSize)) >> 1;
-
-    for (const el of elements) {
-      if (this.toElementFn) {
-        this.push(this.toElementFn(el as R));
-      } else {
-        this.push(el as E);
-      }
-    }
+    this.pushMany(elements);
   }
 
   protected _bucketSize: number = 1 << 12;
@@ -230,6 +223,33 @@ export class Deque<E = any, R = any> extends IterableElementBase<E, R, Deque<E,
     return element;
   }
 
+  /**
+   * Time Complexity: O(1)
+   * Space Complexity: O(1)
+   *
+   * The `shift()` function removes and returns the first element from a data structure, updating the
+   * internal state variables accordingly.
+   * @returns The element that is being removed from the beginning of the data structure is being
+   * returned.
+   */
+  shift(): E | undefined {
+    if (this._size === 0) return;
+    const element = this._buckets[this._bucketFirst][this._firstInBucket];
+    if (this._size !== 1) {
+      if (this._firstInBucket < this._bucketSize - 1) {
+        this._firstInBucket += 1;
+      } else if (this._bucketFirst < this._bucketCount - 1) {
+        this._bucketFirst += 1;
+        this._firstInBucket = 0;
+      } else {
+        this._bucketFirst = 0;
+        this._firstInBucket = 0;
+      }
+    }
+    this._size -= 1;
+    return element;
+  }
+
   /**
    * Time Complexity: Amortized O(1)
    * Space Complexity: O(n)
@@ -259,31 +279,28 @@ export class Deque<E = any, R = any> extends IterableElementBase<E, R, Deque<E,
     return true;
   }
 
-  /**
-   * Time Complexity: O(1)
-   * Space Complexity: O(1)
-   *
-   * The `shift()` function removes and returns the first element from a data structure, updating the
-   * internal state variables accordingly.
-   * @returns The element that is being removed from the beginning of the data structure is being
-   * returned.
-   */
-  shift(): E | undefined {
-    if (this._size === 0) return;
-    const element = this._buckets[this._bucketFirst][this._firstInBucket];
-    if (this._size !== 1) {
-      if (this._firstInBucket < this._bucketSize - 1) {
-        this._firstInBucket += 1;
-      } else if (this._bucketFirst < this._bucketCount - 1) {
-        this._bucketFirst += 1;
-        this._firstInBucket = 0;
+  pushMany(elements: IterableWithSizeOrLength<E> | IterableWithSizeOrLength<R>) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) {
+        ans.push(this.push(this.toElementFn(el as R)));
       } else {
-        this._bucketFirst = 0;
-        this._firstInBucket = 0;
+        ans.push(this.push(el as E));
       }
     }
-    this._size -= 1;
-    return element;
+    return ans;
+  }
+
+  unshiftMany(elements: IterableWithSizeOrLength<E> | IterableWithSizeOrLength<R> = []) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) {
+        ans.push(this.unshift(this.toElementFn(el as R)));
+      } else {
+        ans.push(this.unshift(el as E));
+      }
+    }
+    return ans;
   }
 
   /**
diff --git a/src/data-structures/queue/queue.ts b/src/data-structures/queue/queue.ts
index ecdf06e..49aa52c 100644
--- a/src/data-structures/queue/queue.ts
+++ b/src/data-structures/queue/queue.ts
@@ -25,12 +25,7 @@ export class Queue<E = any, R = any> extends IterableElementBase<E, R, Queue<E,
       this._autoCompactRatio = autoCompactRatio;
     }
 
-    if (elements) {
-      for (const el of elements) {
-        if (this.toElementFn) this.push(this.toElementFn(el as R));
-        else this.push(el as E);
-      }
-    }
+    this.pushMany(elements);
   }
 
   protected _elements: E[] = [];
@@ -131,6 +126,15 @@ export class Queue<E = any, R = any> extends IterableElementBase<E, R, Queue<E,
     return true;
   }
 
+  pushMany(elements: Iterable<E> | Iterable<R>) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) ans.push(this.push(this.toElementFn(el as R)));
+      else ans.push(this.push(el as E));
+    }
+    return ans;
+  }
+
   /**
    * Time Complexity: O(1)
    * Space Complexity: O(1)
diff --git a/src/data-structures/stack/stack.ts b/src/data-structures/stack/stack.ts
index 344bd4a..b508fc3 100644
--- a/src/data-structures/stack/stack.ts
+++ b/src/data-structures/stack/stack.ts
@@ -19,15 +19,7 @@ import { IterableElementBase } from '../base';
 export class Stack<E = any, R = any> extends IterableElementBase<E, R, Stack<E, R>> {
   constructor(elements: Iterable<E> | Iterable<R> = [], options?: StackOptions<E, R>) {
     super(options);
-    if (elements) {
-      for (const el of elements) {
-        if (this.toElementFn) {
-          this.push(this.toElementFn(el as R));
-        } else {
-          this.push(el as E);
-        }
-      }
-    }
+    this.pushMany(elements);
   }
 
   protected _elements: E[] = [];
@@ -48,11 +40,6 @@ export class Stack<E = any, R = any> extends IterableElementBase<E, R, Stack<E,
     return this.elements.length;
   }
 
-  /**
-   * Time Complexity: O(n)
-   * Space Complexity: O(n)
-   */
-
   /**
    * Time Complexity: O(n)
    * Space Complexity: O(n)
@@ -67,6 +54,9 @@ export class Stack<E = any, R = any> extends IterableElementBase<E, R, Stack<E,
   }
 
   /**
+   * Time Complexity: O(1)
+   * Space Complexity: O(1)
+   *
    * The function checks if an array is empty and returns a boolean value.
    * @returns A boolean value indicating whether the `_elements` array is empty or not.
    */
@@ -115,9 +105,29 @@ export class Stack<E = any, R = any> extends IterableElementBase<E, R, Stack<E,
   }
 
   /**
-   * The delete function removes an element from the stack.
-   * @param element: E Specify the element to be deleted
-   * @return A boolean value indicating whether the element was successfully deleted or not
+   * Time Complexity: O(k)
+   * Space Complexity: O(1)
+   *
+   *
+   */
+  pushMany(elements: Iterable<E> | Iterable<R>) {
+    const ans: boolean[] = [];
+    for (const el of elements) {
+      if (this.toElementFn) {
+        ans.push(this.push(this.toElementFn(el as R)));
+      } else {
+        ans.push(this.push(el as E));
+      }
+    }
+    return ans;
+  }
+
+  /**
+   * Time Complexity: O(n)
+   * Space Complexity: O(1)
+   *
+   * The toArray function returns a copy of the elements in an array.
+   * @returns An array of type E.
    */
   delete(element: E): boolean {
     const index = this.elements.indexOf(element);
@@ -125,9 +135,11 @@ export class Stack<E = any, R = any> extends IterableElementBase<E, R, Stack<E,
   }
 
   /**
-   * The deleteAt function deletes the element at a given index.
-   * @param index: number Determine the index of the element to be deleted
-   * @return A boolean value
+   * Time Complexity: O(n)
+   * Space Complexity: O(1)
+   *
+   * The toArray function returns a copy of the elements in an array.
+   * @returns An array of type E.
    */
   deleteAt(index: number): boolean {
     const spliced = this.elements.splice(index, 1);
diff --git a/src/data-structures/trie/trie.ts b/src/data-structures/trie/trie.ts
index 38b123b..424d475 100644
--- a/src/data-structures/trie/trie.ts
+++ b/src/data-structures/trie/trie.ts
@@ -268,7 +268,7 @@ export class Trie<R = any> extends IterableElementBase<string, R, Trie<R>> {
    * @returns The `addMany` method returns an array of boolean values indicating whether each word in
    * the input iterable was successfully added to the data structure.
    */
-  addMany(words: Iterable<string> | Iterable<R> = []): boolean[] {
+  addMany(words: Iterable<string> | Iterable<R>): boolean[] {
     const ans: boolean[] = [];
     for (const word of words) {
       if (this.toElementFn) {