Here is a suggested title for class notes on input validation: "Validating User Input: JavaScript Techniques for Checking Valid or Invalid Form Data"

Key Points: Class Structure: The InputValidator class is designed to take an input during instantiation and provides methods to check its validity. Constructor: The class has a constructor that initializes the input property. isValid Method: The isValid method checks whether the input is valid based on certain criteria. In this example, it checks if the input is a non-empty string. getMessage Method: The getMessage method provides a message based on the input's validity. It calls the isValid method and returns a corresponding message. Example Usage: Instances of the InputValidator class are created with different inputs, and the getMessage method is called to get the validation message. Adaptability: Modify the isValid method to include specific validation criteria based on your requirements, such as length checks, format checks, etc. Reusability: This class structure can be reused for different types of input validation by extending or modifying the validation criteria. Error Handling: Depending on your application's requirements, you might want to include additional error handling mechanisms, such as throwing exceptions or returning error codes.