MassAddition Operator

public static Mass operator +(
	Mass value1,
	Mass value2
)

Public Shared Operator + ( 
	value1 As Mass,
	value2 As Mass
) As Mass

public:
static Mass operator +(
	Mass value1, 
	Mass value2
)

static let inline (+)
        value1 : Mass * 
        value2 : Mass  : Mass

JavaScript does not support overloaded operators.