class Stack { constructor(){ this.array = []; } peek() { return this.array[this.array.length-1]; } push(value){ this.array.push(value); return this; } pop(){ this.array.pop(); return this; } } const myStack = new Stack(); myStack.peek(); myStack.push('google'); myStack.push('ztm'); myStack.push('discord'); myStack.peek(); myStack.pop(); myStack.pop(); myStack.pop(); //Discord //ZTM //google