Salesforce JavaScript Developer Practice Exam

What will happen if you attempt to call getFullName on a member instance of the Person constructor?

1. TypeError

2. SyntaxError

3. Lydia Hallie

4. undefined undefined

The correct answer is: TypeError

The correct answer is that attempting to call getFullName on a member instance of the Person constructor will result in a TypeError if the function is not properly bound to an instance of the object. This typically occurs when trying to access a method that is not defined in the context of the instance or if the method is invoked without associating it with the instance of the object. In JavaScript, if a method is defined within a constructor but is not correctly bound or called on an object instance, it could lead to situations where "this" does not refer to the intended object. As a result, when getFullName is invoked, it may refer to an undefined value or context, which triggers the TypeError, indicating that the method cannot be used in its current context. If, however, the method is correctly defined and called on an appropriate instance, it would return the concatenated first and last name of the person as intended, which relates to why the other responses are not applicable. If the method was accessible and appropriately called, it could yield a full name like "{FirstName} {LastName}". If it's called without any such context, it could potentially return values of "undefined," depending on how the method is written and how it interacts