This function is a shortcut of the following expression:
o = getParam(paramName);
(o != null) ? o.toArray() : null
Parameters:

paramName

The name of the template parameter, whose value is requested.

If the template has no parameter with that name, an error will be raised.

Note: The parameter name may be omitted only when this function is called within enabling conditions found in the definition of a template parameter. That will mean the access to the value of this very parameter itself (being defined).

See Also:
getParam(), toArray()