React Check if String is Empty

 
<!DOCTYPE html>
<html>
<head> </head>
<body>
    <div id="app">
        <h1>Javascript Check String is Empty or not</h1>
        <button onclick="checkString()">Check String</button>
        <p id="output"></p>
    </div>
    <script>
        const string = '         ';
        function isEmpty(str) {
            return !str || str.trim().length === 0;
        }
        function checkString() {
            var result = isEmpty(string);
​
            if (result) {
                document.getElementById("output").innerHTML = "String is Empty";
            } else {
                document.getElementById("output").innerHTML = "Sting has some Value";
            }
        }
    </script>
</body>
</html>