bitovi/js-training

Chris Klanac

@cklanac

But the proto object(s) can also have properties so a puppy has a spine (like the in the examples) which can be looked up on the proto

You can use hasOwnProperty() to check if the property is on the specific object or looked up in the proto chain

Emmanuel Hernandez

@ManuH

hey guys, I have a question about the exercise, the function "hasOwnProperty" is already defined?

Alexis Abril

@alexisabril

@ManuH Yep. “hasOwnProperty” is a method that exists on the Object.prototype.

Lotfi Harrabi

@lotfire

@ManuH yes

Emmanuel Hernandez

@ManuH

nice, thanks

Emmanuel Hernandez

@ManuH

module('new, dot, and dotcall');
test('DOT', function(){
var person = new Person('Alexis');
var species = DOT(person, 'species');
equal(species, 'Homo Sapien', 'property accessed');

what is 'equal'?

Alexis Abril

@alexisabril

@ManuH equal, deepEqual and ok are all QUnit assertion methods. We have a set of tests in the html just to validate the exercises

Emmanuel Hernandez

@ManuH

cool thanks

Alexis Abril

@alexisabril

np!

Emmanuel Hernandez

@ManuH

I'm still trying to do the DOTCALL

but I don't get what's supposed to do

Alexis Abril

@alexisabril

@ManuH DOTCALL simulates invoking a method on an object. For example:

person.speak(); //invokes the speak method, which may exist anywhere on the prototype, but uses “person” as “this”.

DOTCALL(person, ‘speak’); //will do the same as above

Imanuel Gittens

@imanuelgittens

Hi guys. I'm learning a lot from your training.

You're awesome

I'm trying to make the DOT function and I wanted some direction.

I'm thinking that to walk the proto chain, there must be some kind of loop involved

however i don't know when that loop should end

should it end when proto is equal to the window object?

Imanuel Gittens

@imanuelgittens

DOT = function(obj, prop) {

            if (obj.hasOwnProperty(prop)) {
                return obj[prop];
            } else {

                var parent = obj.__proto__;
                if(parent.hasOwnProperty(prop){
                    return parent[prop];  

                }
            }
        }

That's what I have so far

Imanuel Gittens

@imanuelgittens

DOT = function(obj, prop) {

            if (obj.hasOwnProperty(prop)) {
                return obj[prop];
            } else {
                return DOT(obj.__proto__, prop);
            }

        };

or maybe my second code snippet might work?

thanks

Alexis Abril

@alexisabril

hey everyone! we’ll get started shortly

to recap last week’s exercises: http://jsbin.com/yamuna/latest/watch?js,output

we’ll tackle that first

Imanuel Gittens

@imanuelgittens

I was really close to solving last week's exercise.

I forgot to check if the object existed

Joe Crick

@joe-crick

Nice!

Zurc

@Zurc

You said that you're setting proto but using prototype?

yes

John Hitz

@johnhitz

So proto is just the link or pointer to the prototype?

sorry that's proto

Joe Crick

@joe-crick

@Zurc: Was your question answered?

Zurc

@Zurc

I think I understood, still another question: Do we use proto in our code at all?

thanx!

Joe Crick

@joe-crick

NP!

Madelene Campos

@Madelene

same here

(thanks for repeating) :)

Joe Crick

@joe-crick

John Hitz

@johnhitz

Can you show that in the terminal

Joe Crick

@joe-crick

Are you asking to have the exercise shown in the terminal?

John Hitz

@johnhitz

Not using a different this for each dog1, dog2, and pup

Joe Crick

@joe-crick

@johnhitz Do you mean how to fix the example?

of the shared pup value?

John Hitz

@johnhitz

Yes

Imanuel Gittens

@imanuelgittens

Maybe you could just once over the slide with dog1, dog2, and pup?

Thank you

Joe Crick

@joe-crick

Sure thing!

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