score:2

Accepted answer
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<div id="root"></div>

score:0

handleInputChangeUpperCase = e => {    
    this.setState({ [e.target.name]: e.target.value });
};

score:2

  <input id="text-area" type="text" value="123"/>

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