Extract the value of field from an object.
| Any object that contains accessible named fields.|
| The name of the field.|
| The value of the field.|
If the first input is a Java object, and has a public field with the same
name the value of the field is returned. If the object has a public method
getFieldName (i.e. for
get(m, "text") , the method
is located) , the function returns the result of calling the method.
If the first input is a Mathnium object, the value of the field with the
given name, if it exists, is returned.
If the first input is a struct array, the value of the named member, if
it exists, is returned.
>var x, y