diff --git a/src/hash-table.js b/src/hash-table.js
index 7edba9e..d520946 100644
--- a/src/hash-table.js
+++ b/src/hash-table.js
@@ -8,26 +8,81 @@ class HashTable {
     this.storage = new LimitedArray(this.limit);
     // Do not modify anything inside of the constructor
   }
-
+  checkCapacity() {
+    let fullcells = 1;
+    this.storage.each((bucket) => {
+      if (bucket !== undefined) fullcells++;
+    });
+    return fullCells / this.limit > 0.75;
+  }
+  resize() {
+    this.limit *= 2;
+    const oldStorage = this.storage;
+    this.storage = new LimitedArray(this.limit);
+    oldStorage.each((bucket) => {
+      if (bucket === undefined) return;
+      bucket.forEach((pair) => {
+        this.insert(pair[0], pair[1]);
+      });
+    });
+  }
   // Adds the given key, value pair to the hash table
   // Fetch the bucket associated with the given key using the getIndexBelowMax function
   // If no bucket has been created for that index, instantiate a new bucket and add the key, value pair to that new bucket
   // If the key already exists in the bucket, the newer value should overwrite the older value associated with that key
   insert(key, value) {
-    
+    if (this.checkCapacity()) this.resize();
+    const index = getIndexBelowMax(key.toString(), this.limit);
+    const bucket = this.storage.get(index);
+    if (bucket === undefined) {
+      this.storage.set(index, [[key, value]]);
+      return;
+    }
+    for (let i = 0; i < bucket.length; i++) {
+      const cell = bucket[i];
+      if (cell[0] === key) {
+        cell[1] = value;
+        this.storage.set(index, bucket);
+        return;
+      }
+    }
+    bucket.push([key, value]);
+    this.storage.set(index, bucket);
   }
+/* bucket.foreach((cell) => {
+if (cell[0] === key) {
+cell[1] = value;
+this.storage.set(index, bucket);
+}
+}); */
+
   // Removes the key, value pair from the hash table
   // Fetch the bucket associated with the given key using the getIndexBelowMax function
   // Remove the key, value pair from the bucket
   remove(key) {
-    
+    const index = getIndexBelowMax(key.toString(), this.limit);
+    const bucket = this.storage.get(index);
+    if (bucket.length === 1) {
+      const value = bucket[0][1];
+      this.storage.set(index, undefined);
+      return value;
+    }
+    bucket.forEach((pair, i) => {
+      if (pair[0] === key) bucket.splice(i, 1);
+      this.storage.set(index, bucket);
+    });
   }
   
   // Fetches the value associated with the given key from the hash table
   // Fetch the bucket associated with the given key using the getIndexBelowMax function
   // Find the key, value pair inside the bucket and return the value
   retrieve(key) {
-    
+    const index = getIndexBelowMax(key.toString(), this.limit);
+    const bucket = this.storage.get(index);
+    if (bucket === undefined) return undefined;
+    for (let i = 0; i < bucket.length; i++) {
+      if (bucket[i][0] === key) return bucket[i][1];
+    }
   }
 }
 
diff --git a/src/linked-list.js b/src/linked-list.js
index 267e295..a9ca071 100644
--- a/src/linked-list.js
+++ b/src/linked-list.js
@@ -9,18 +9,67 @@ class LinkedList {
   // If the list is empty, the new element is considered the tail as well as the head
   // If there is one element in the list before the new element is added, the new element becomes the tail of the list
   addToTail(value) {
-
+    const node = {
+      value,
+      next: null
+    };
+    if (this.head === null) {
+      this.head = node;
+      this.tail = node;
+    } else {
+      this.tail.next = node;
+      this.tail = node;
+    }
+/* const newNode = {
+value: item,
+next: null
+};
+if (this.head === null) {
+this.head = newNode;
+this.tail = newNode;
+return;
+}
+if (this.head.next === null) {
+this.tail = newNode;
+this.head.next = newNode;
+return;
+}
+this.tail.next = newNode;
+this.tail = newNode;
+*/
   }
   // Removes the current head node from the list, replacing it with the next element in the list
   // Returns the value of the removed node
   removeHead() {
-
+    if (this.head === null) return null;
+    if (this.head === this.tail) {
+      const value = this.head.value;
+      this.head = null;
+      this.tail = null;
+      return value;
+/* if (this.head === null) return;
+if (this.head.next === null) {
+const reference = this.head;
+this.head = null;
+this.tail = null;
+return reference;
+}
+const value = this.head.value;
+this.head = this.head.next;
+return value;
+*/
   }
   // Checks the linked list for the given value
   // Returns true if the the value is found in the list, false otherwise
   contains(value) {
-
+  if (this.head === null) return false;
+//here we are using recursive function.( or you can use while loop)
+const searchLinkedList = (node) => {
+if (node.value === value) return true;
+if (node.next === null) return false;
+return searchLinkedList(node.next);
+};
+return searchLinkedList(this.head)
   }
 }
-
 module.exports = LinkedList;
diff --git a/src/queue.js b/src/queue.js
index dcf7ad7..8afe116 100644
--- a/src/queue.js
+++ b/src/queue.js
@@ -5,7 +5,18 @@
   4. Add a `dequeue` method that removes the item in the queue that was added earliest
 */
 class Queue {
-
+  constructor() {
+    this.storage = [];
+  }
+  enqueue(value) {
+    this.storage.unshift(value);
+  }
+  dequeue() {
+    return this.storage.pop();
+  }
+  get size() {
+    return this.storage.size;
+  }
 }
 
 module.exports = Queue;
diff --git a/src/stack.js b/src/stack.js
index 4312b41..96bc404 100644
--- a/src/stack.js
+++ b/src/stack.js
@@ -5,7 +5,27 @@
   4. Add a `pop` method that removes the most recently-added item to the stack
 */
 class Stack {
-
+  constructor() {
+    this.storage = [];
+  }
+  add(value) {
+    this.storage.push(value);
+  }
+  remove(value) {
+    return this.storage.pop();
+  }
+  get size() {
+    return this.storage.length;
+  }
 }
+module.exports = Stack;
+const stack = new stack();
+/* 
+what is get size and example-
+stack.add(5);
+stack.add(10);
+stack.add(15);
+console.log(stack.size); 
+*/
 
 module.exports = Stack;