Why doesn't cloneNode work?

Question

JavaScript

I need to copy the block and paste it, but I can't figure out why cloneNode doesn't work, it throws an error "cloneBlock.cloneNode is not a function"

HTML

<div class="blocks">
    <div class="block">
      <h1 class="title">Привет 1</h1>
      <p>Lorem ipsum dolor 1</p>
    </div>
  </div>
  <button class="copy">Копировать</button>

JS

let cloneBlock = document.getElementsByClassName('.block');
let parent = document.querySelector('.blocks'); 
let copy = document.querySelector('.copy');

copy.addEventListener('click', function(){
  const exemple = cloneBlock.cloneNode(true);
  parent.append(exemple)
})

Answer 1

getElementsByClassName doesn't need a dot. Due to the fact that cloneBlock is empty (undefined), an error occurred.
Write AND, for the future, do not mix querySelector with the rest, otherwise you will also get confused.
getElementsByClassName('block');