const newItem = new Item("book", 'Biography')

newItem.displayItem() => ReferenceError: Item is not defined

class Item {
  constructor(name, description) {
    this.name = name
    this.description = description
  }

  displayItem() {
    console.log("item: "+ this.name)
  }
}

/////////

newItem.displayItem() => Cannot read property 'displayItem' of undefined

class Item {
  constructor(name, description) {
    this.name = name
    this.description = description
  }

  displayItem() {
    console.log("item: "+ this.name)
  }
}

const newItem = new Item("book", 'Biography')