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HTML

              
                <html>
<head>
  <meta charset="utf-8">
  <title>JavaScript program that implements a stack and checks if the stack is a subset of another stack</title>
</head>
<body>

</body>
</html>
              
            
!

CSS

              
                
              
            
!

JS

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

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

  pop() {
    if (this.items.length == 0) {
      return "Underflow";
    }
    return this.items.pop();
  }
  
  isEmpty() {
    return this.items.length == 0;
  }

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

 isSubsetOf(stk) {
    for (let i = 0; i < this.items.length; i++) {
      if (!stk.items.includes(this.items[i])) {
        return false;
      }
    }
    return true;
  }  
 displayStack(stack) {
  console.log("Stack elements are:");
  let str = "";
  for (let i = 0; i < stack.items.length; i++)
    str += stack.items[i] + " ";
  return str.trim();
 }
}
const stack1 = new Stack();
stack1.push(1);
stack1.push(2);
stack1.push(3);
console.log("Stack1:");
console.log(stack1.displayStack(stack1));
const stack2 = new Stack();
stack2.push(2);
stack2.push(3);
console.log("Stack2:");
console.log(stack2.displayStack(stack2));
const stack3 = new Stack();
stack3.push(4);
stack3.push(5);
console.log("Stack3:");
console.log(stack3.displayStack(stack3));
console.log("Is stack2 is the subset of stack1!");
console.log(stack2.isSubsetOf(stack1));
console.log("Is stack3 is the subset of stack1!");
console.log(stack3.isSubsetOf(stack1));

              
            
!
999px

Console