Array elements are accessed using their index number:
Array indexes start with 0:
[0] is the first array element
[1] is the second
[2] is the third ...
<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
<script>
var a = ["Hamza",18,"Male","BCA"];
document.write(a + "<br>");
a[0] = "Umar";
document.write(a + "<br>");
a[1] = 20;
document.write(a + "<br>");
</script>
</head>
<body>
</body>
</html>
Array elements can be deleted using the JavaScript operator delete.
Using delete leaves undefined holes in the array.
<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
<script>
var a = ["Hamza",18,"Male","BCA"];
document.write(a + "<br>");
a[0] = "Umar";
document.write(a + "<br>");
delete a[1];
document.write(a + "<br>");
</script>
</head>
<body>
</body>
</html>