Description: Determine whether the argument is an array.
objObject to test whether or not it is an array.
$.isArray()
returns a Boolean indicating whether the object is a JavaScript array (not an array-like object, such as a jQuery object).
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
Is [] an Array? <b></b>
<script>$("b").append( "" + $.isArray([]) );</script>
</body>
</html>