const app = Vue.createApp({
  data: () => ({
    newItem: "",
    items: ["buy milk"],
  }),
  methods: {
    addItem() {
      if (!this.newItem) return;
      this.items.unshift(this.newItem);
      this.newItem = "";
    },
    removeItem(index) {
      this.items.splice(index, 1);
    },
  },
});

app.mount("#comp");