jQuery.isArray()
jQuery.isArray( obj ) Returns: boolean
Description: Determine whether the argument is an array.
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version added: 1.3jQuery.isArray( obj )
objObject to test whether or not it is an array.
$.isArray() returns a Boolean indicating whether the object is a JavaScript array (not an array-like object, such as a jQuery object).
Example:
Finds out if the parameter is an array.
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
</head>
<body>
Is [] an Array? <b></b>
<script>$("b").append( "" + $.isArray([]) );</script>
</body>
</html>