×

Save Your Code

If you click the save button, your code will be saved, and you get an URL you can share with others.

By clicking the "Save" button you agree to our terms and conditions.

Report Error

×

Save to Google Drive

If you have a Google account, you can save this code to your Google Drive.

Google will ask you to confirm Google Drive access.

×

Open from Google Drive

If you have saved a file to Google Drive, you can open it here:

Result Size: 625 x 571
x
 
<!DOCTYPE html>
<html>
<body>
<p>Click the button to check get the index of the first element in the array that has a value of 18 or more.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<p><strong>Note:</strong> The findIndex() method is not supported in IE 11 (and earlier versions).</p>
<script>
var ages = [3, 10, 18, 20];
function checkAdult(age) {
  return age >= 18;
}
function myFunction() {
  document.getElementById("demo").innerHTML = ages.findIndex(checkAdult);
}
</script>
</body>
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_findindex by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:26 GMT -->
</html>
×

Report a Problem: