JavaScript: Stack Data Structure

js-stack-data-structure.js

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

  push(elements) {
    this.items.push(elements);
  }

  pop() {
    return this.items.pop();
  }

  peek() {
    return this.items[this.items.length - 1];
  }

  isEmpty() {
    return this.items.length === 0;
  }

  clear() {
    this.items = [];
  }

  size() {
    return this.items.length;
  }

  toString() {
    return this.items.toString();
  }
}

const books = new Stack();

books.push("The Hobbit");
books.push("LOTR: The Fellowship of the Ring");
books.push("LOTR: The Two Towers");
books.push("LOTR: The Return of the King");

console.log(books.peek()); // => "LOTR: The Return of the King"

books.pop();
books.pop();

console.log(books.toString()); // => "The Hobbit,LOTR: The Fellowship of the Ring"

console.log(books.size()); // => 2

books.clear();

console.log(books.isEmpty()); // => true