Java Script Array Advanced Methods

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Array.findIndex()</h2>
<script>
const numbers = [4, 9, 16, 25, 29];

document.write("First number over 18 has index " + numbers.findIndex(myFunction));
function myFunction(value, index, array) {
  return value > 18;
}
</script>

</body>
</html>

​x
 
<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Array.findIndex()</h2>
<script>
const numbers = [4, 9, 16, 25, 29];
​
document.write("First number over 18 has index " + numbers.findIndex(myFunction));
function myFunction(value, index, array) {
  return value > 18;
}
</script>
​
</body>
</html>