#root
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const {useReducer} = React;
const {render} = ReactDOM;

function Counter() {
  const ['???'] = useReducer('???');
  
  const increment = () => {};
  const decrement = () => {};
  
  return (
    <div>
      {count}
      <button onClick={increment}> +1 </button>
      <button onClick={decrement}> -1 </button>
    </div>
  )
}


render(<Counter />, document.getElementById('root'))
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External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js
  2. https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js
  3. https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/7.8.7/polyfill.min.js