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Micah Dunson
34,368 PointsUnable to properly modify code to inherit
the code asks to use the call() and when I do I get the error message "You don't need to set the firstName or lastName properties, the Person.call will handle that!"
to modify 'Teacher' to inherit from 'Person' I'm doing: Person.call(this, firstName, lastName);
I am unsure what is wrong about this code
function Person(firstName, lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
Person.prototype.fullName = function() {
return this.firstName + " " + this.lastName;
};
function Teacher(firstName, lastName, roomNumber) {
Person.call(this, firstName , lastName)
this.firstName = firstName;
this.lastName = lastName;
this.room = roomNumber;
}
2 Answers
Jason Anders
Treehouse Moderator 145,860 PointsHi Michah,
The first part of the challenge wants you to .call the Person constructor in the Teacher constructor. You are very close, but you do not need the two lines for the this.firstName or this.lastName as that will be handled by the Person Constructor. So Task 1 should look like this:
function Teacher(firstName, lastName, roomNumber) {
Person.call(this, firstName, lastName);
this.room = roomNumber;
}
For the second part of the challenge, you just have to add the line of code so that the Teacher can "inherit" from the Person.
function Teacher(firstName, lastName, roomNumber) {
Person.call(this, firstName, lastName);
this.room = roomNumber;
Teacher.prototype = Object.create(Person.prototype);
I'm not sure I can fully explain this part well. It's basically allowing the Teacher to use the Person. Andrew explains it in the previous video (the one before the challenge) at about 2:30.
I don't know where or why you have a return statement there. The challenge didn't ask for anything to be returned, and the challenges are very specific in what you can and can't put in in order to pass.
Hope this makes sense and helps. Keep Coding! :)
Micah Dunson
34,368 PointsMakes perfect sense. Thanks man! I knew I was missing something basic. I hear ya on the exercises.