isArraylike

function isArraylike( obj ) {
	var length = obj.length,
		type = jQuery.type( obj );
 
	if ( jQuery.isWindow( obj ) ) {
		return false;
	}
 
	if ( obj.nodeType === 1 && length ) {
		return true;
	}
 
	return type === "array" || type !== "function" &&
		( length === 0 ||
		typeof length === "number" && length > 0 && ( length - 1 ) in obj );
}