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<!DOCTYPE html> <html> <body> <h1>JavaScript Arrays</h1> <h2>findIndex()</h2> <p>Click "Test" to return the index of the first array element that has a value above this number:</p> <p><input type="number" id="toCheck" value="18"></p> <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> const numbers = [4, 12, 16, 20]; function checkValue(x) { return x > document.getElementById("toCheck").value; } function myFunction() { document.getElementById("demo").innerHTML = numbers.findIndex(checkValue); } </script> <p>findIndex() is not supported in Internet Explorer.</p> </body> </html>
