**What Is Stack and Its Operations in Data Structure?**

A stack is a fundamental data structure in computer science that follows the Last-In-First-Out (LIFO) principle. It is an abstract data type that represents a collection of elements with two main operations: __push__ and __pop__. The push operation adds an element to the top of the stack, while the pop operation removes and returns the topmost element.

## Basic Operations on a Stack:

A stack typically supports various operations to manipulate its contents. Apart from push and pop, other common operations include:

**Peek:** This operation returns the value of the topmost element without removing it from the stack.
**IsEmpty:** It checks whether the stack is empty or not. Returns true if there are no elements in the stack; otherwise, it returns false.
**Size:** This operation returns the number of elements present in the stack at a given time.

## The Implementation of Stack:

A stack can be implemented using various data structures, such as arrays or linked lists. Here, we will discuss the implementation using an array-based approach.

### Array-Based Implementation:

To create a stack using arrays, we need to define an array variable to store elements and an index variable to keep track of the top element. Let’s see how this can be done in code:

“`html

<!DOCTYPE html>
<html>
<head>
<title>Stack Implementation</title>
</head>
<body>
<script>
class Stack {
constructor() {
this.stack = [];
this.top = -1;
}
push(element) {
this.stack[++this.top] = element;
}
pop() {
if (this.isEmpty()) {
return "Stack Underflow";
}
return this.stack[this.top--];
}
peek() {
if (this.isEmpty()) {
return "Stack is empty";
}
return this.top];
}
isEmpty() {
return this.top === -1;
}
size() {
return this.top + 1;
}
}
// Usage
const stack = new Stack();
stack.push(10);
stack.push(20);
stack.push(30);
console.log(stack.pop()); // Output: 30
console.peek()); // Output: 20
</script>
</body>
</html>

“`

## Conclusion:

A stack is a powerful data structure that allows efficient management of data in a Last-In-First-Out manner. It is widely used in many applications, such as expression evaluation, function call management, and browser history. Understanding stacks and their operations is crucial for any programmer to write efficient algorithms and solve complex problems.

Now that you have learned about stacks and their operations, you can confidently incorporate them into your future programming projects!

### 10 Related Question Answers Found

What Is Stack in Data Structure and Its Types? A stack is a fundamental data structure in computer science that follows the Last-In-First-Out (LIFO) principle. It is an abstract data type that represents a collection of elements with two main operations: push and pop.

What Is Stack in Data Structure and Its Application? A stack is a fundamental data structure in computer science that follows the Last-In-First-Out (LIFO) principle. It can be visualized as a stack of plates, where the last plate placed on top is the first one to be removed.

What Is Stack in Data Structure: How It Works? A stack is a fundamental data structure in computer science that follows the Last-In-First-Out (LIFO) principle. It is like a physical stack of items where the last item placed on top is the first one to be removed.

How Does Stack Works in Data Structure? A stack is a fundamental data structure in computer science that follows the “Last-In, First-Out” (LIFO) principle. It is an abstract data type that represents a collection of elements with two primary operations: push and pop.

What Is Stack in Data Structure? A stack is a fundamental data structure in computer science that follows the Last In, First Out (LIFO) principle. It is an abstract data type that represents a collection of elements with two primary operations: push and pop.

What Is Stack in Data Structure Real Life Example? In the world of computer science and programming, data structures play a crucial role in organizing and managing data efficiently. One such data structure is a stack.

A stack is a linear data structure that follows the Last-In-First-Out (LIFO) principle. It is an ordered collection of elements where the addition and removal of items happen only at one end called the top. The element that is added last is the first one to be removed.

What Is the Use of Stack in Data Structure? A stack is a fundamental data structure in computer science that follows the Last-In-First-Out (LIFO) principle. It is named after the real-life concept of a stack, where objects are stacked on top of each other and can only be accessed from the top.

What Is Meant by Stack in Data Structure? A stack is a fundamental data structure in computer science that follows the Last In First Out (LIFO) principle. It can be visualized as a stack of plates where the last plate placed on top is the first one to be removed.

A stack is a fundamental data structure in computer science. It is an abstract data type that follows the Last-In-First-Out (LIFO) principle. In simple terms, this means that the last element added to the stack is the first one to be removed.