evaluate method

@override dynamic evaluate([ dynamic arg ])

Evaluates the expression for a given value of x.

This method returns the value of the expression when evaluated at x. If x is not provided, the method should return the general form of the expression or a representative value.

Returns:

• A dynamic representing the evaluated value of the expression.

Implementation

@override
dynamic evaluate([dynamic arg]) {
  var obj = object.evaluate(arg);
  if (obj == null) return null;
  return _getMember(obj, property.name);
}