Implementing Stack in javascript

Hello 👋,

This is an article on implementing stack data structure in javascript

We already know stack is data structure. It has methods like push, pop, top, size and isEmpty

push

It will insert the element at first.

pop

It will delete and returns the first element.

top

It will return first element

size

It will return size of an stack i.e no of elements in stack

isEmpty

It will return true if stack doesn’t have any elements otherwise it will return false

class Stack {
  constructor() {
    this.list = []
  }

  push(ele) {
    this.list.unshift(ele)
  }

  pop() {
    return this.list.shift()
  }

  top() {
    return this.list[0]
  }

  size() {
    return this.list.length
  }

  isEmpty() {
    return this.list.length === 0
  }
}

Usage

const mystack = new Stack()

mystack.isEmpty() // true
mystack.push("a") // returns undefined but it will add element to list
mystack.push("b")
mystack.push("c")
mystack.isEmpty() // false
mystack.top() // c
mystack.pop() // c
mystack.top() // b
mystack.size() // 2

Thank you!! Cheers!!!