Problem with Inheritance in JavaScript code example. about learning-area HOT 2 CLOSED

Hi there,

It sounds to me like there is some kind of error in your code. Either you have misread an instruction, or made a typo. It is useful for me to explore what went wrong, as there is always scope for me to make my instructions clearer.

So, first of all, check your code against the finished version on our repo:

• https://github.com/mdn/learning-area/blob/master/javascript/oojs/advanced/oojs-class-inheritance-finished.html (source code)
• https://mdn.github.io/learning-area/javascript/oojs/advanced/oojs-class-inheritance-finished.html (live example)

I've tried running

Teacher.prototype = Object.create(Person.prototype);

in the console on this page, and it works as expected. Also, the functions are contained on the prototype inside properties, rather than being hung off the prototype directly, so you'll have more luck with Person.prototype.greeting and Teacher.prototype.greeting (no parentheses).

If you still have trouble, feel free to throw me your code source, and I'll have a look and see what the trouble is.

from learning-area.

I tried both the source code and live versions in Firefox and Chrome browsers. When I run:
Object.getOwnPropertyNames(Teacher.prototype);
I only see:
Array [ "constructor", "greeting" ]

But I can query all the function definitions when I make the calls without parenthesis. In retrospect, I guess it doesn't make sense to execute a function against its prototype, only on its instance. Tried this on teacher1 and everything worked fine.

Thanks for your help!

from learning-area.