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Welcome back, welcome to another lecture, and today we're going to learn about objects, so objects

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are the second data structure in JavaScript, but it can be also JavaScript type.

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And this is very interesting.

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So objects allows us to group values, including other objects to build more complex structures.

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And there just more a little bit more advanced than arrays.

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So objects are collection of properties.

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Now, create new file here.

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And before I just start explaining.

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So creating a file collector seven link it in the index HMO.

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Now what about the arrays?

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So we w three schools.

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So if you search for JavaScript array methods, there's a whole bunch of lists here.

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So I didn't show you this page last time, but you should probably know that we three schools is a place

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that you can learn a lot of things.

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Now just make sure that you go through some of the methods here and practice them.

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That's it.

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So let's continue working E with the objects now.

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Make a comment saying JavaScript objects that said, let's write our first JavaScript object in order

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to understand what are what are the objects.

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So var student equal to curly brackets name.

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Let's put it here Toby.

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Then we have age thirty three.

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Then I'm going to say occupation.

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Oops is going to be that that web developer.

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Nice save this one.

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So our object is called student in how we know its object.

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Well, we have a curly brackets, and that's a very different from the arrays with arrays.

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We have the other brackets.

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Right.

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So that is something that is very different from the arrays.

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So the square brackets are different than this curly brackets.

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Right.

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And also in arrays, we have indexes in here.

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We don't have indexes.

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But what we do have here is property, name and value.

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So this is called property name.

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This is a value or you will read somewhere.

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It's called key value pair.

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And this is the key and this is the value.

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So property name and holds a value of TARBY property.

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Each holds a value of thirty three and occupation holds the value of that debt.

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So that is the difference with the area.

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We had index based structure and now we have here we have key value pairs structure.

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Right.

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So that is a little bit pretty much difference.

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So how we can get the property from the objects is pretty much different to how we get the property

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from Auris so we can access it with the name of the object with the student.

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Then we need to use DOT in the name of the property.

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So let's say I want to get the student name, how I can do this.

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Well because of that lock.

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And first let me grab the student to see what, what the object will look like if it is now we see that

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its object and prototype its object.

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We don't have to worry about this part at this stage.

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So we have name, age, occupation.

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That's pretty much it.

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Now I want to access the name so I can do loops.

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I can do consult that law student.

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Now, in order to access the name, I will use DOT and the property name.

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That's pretty much it.

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Save it then I get Tommy.

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Now, if you want to get the H, you do the same thing with H.

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You do the same thing.

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We occupation.

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So this is how you are getting get the name age from student object, right?

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Very good.

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Now we know how to get the name, how to get the properties of the object.

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Also, same as Deery, we can modify or add or remove properties from a specific object.

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So let's add student I.D. here.

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I want to have a student aid to this student objects how we can do this.

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So student, I need to use student.

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That's the name of my object.

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Then I the ID and then I need to specify.

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One, two, three, four, five, six.

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Yep.

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That's pretty much it.

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Save it now.

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Cancel that law student object.

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Let's see if anything has changed.

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Very good.

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Now I have another property and a value.

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So this is how I can add things inside the objects.

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It's a little bit different than the race, but it's a very self explanatory.

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So what do you think this will do?

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So if I do student that age, but I already have H and I will set that one to twenty three.

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Right.

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Save it, cancel that log and say student again because I need to access to this one.

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Now look what happened the ages there.

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But the values change because it's already, we already have the property called H but we just set another

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or we modify the value of thirty three with twenty three.

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Now you know how to create a new property and how also you can modify the existing value of a property

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that is pretty much it.

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Now, the concept behind the data structures is very simple, and it's to keep things organized, so

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objects are very good for storing data like the data we just created for this student or for users.

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But it can be just for anything or just about anything that can be classified as a good example, what

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objects can be.

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Now, the power of objects they can is.

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That they can also hold on the release of items, so let's create an array of items here and we'll be

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logical here is to put these subjects.

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So I'm just going to put here subjects as an array.

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And inside this array, I will have a couple of strings.

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Oops, sorry, so I will have calculous here.

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Then I will have database's.

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Then I will have C++ or Java programming, then I will have C++, then I will have cyber cyber security.

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Then I will have Hoopes.

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Then I have networking and that's enough.

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That is pretty much cool now, even if you put a comma here at the end, it will not throw you an error.

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And if you see this in your workplace or in order to Dorians online, then you should know that this

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will not throw you an error, although we haven't specified anything down there.

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Right.

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OK, now how we can access these.

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For example, I want these students to access to C++.

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Well, let's go back in our browser and we will have now the subjects are.

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So if I go to the student, only the subjects that will give me back the array that we just specify

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before.

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But I want to grab these C++ and I need to know it's what I d or its index.

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Now, if you using Google Chrome, if you click on the arrow on your keyboard up arrow key and it will

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bring the last executed command.

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Now I need these brackets, square brackets and I need to only provide the number three or the index

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in order to get the what the subject C++.

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So this is how you can access the items within that.

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This object are actually items within this array.

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Right.

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And this array belongs to the student object.

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Very good.

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Now let's put it back here.

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So comes along and I'm going to.

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Make sure that I just going to copy the same thing now, you're going to have it for your own so you

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can review this one later on.

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Now, here, I'm going to say get the.

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Array item called C++ from.

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Student object, very good.

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Now, what I haven't told you last time, previous lectures is that I can also have an array.

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And in that area, I can have a student object, so why I didn't tell you this?

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Well, we have uncovered the objects and it was not logical to say that array can hold an object as

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well.

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So let me just show you how we can write that one.

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So create I'm going to say var here and let's create a student array and this student array will have

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three objects.

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So how are we going to define an object with this curly brackets in every every student will have student

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ID and every object will have a student ID and student subject count.

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OK, now student ID it will be let's put them inside quotes so it will be string comma and subjects

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count.

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It will be what the subject count will be.

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Let's put a number here.

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Three.

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OK, now next object.

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We need to separate them by a comma because this is considered as a single item, right?

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Because it's in memory.

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That will be second item.

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This will be the third item.

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Let's put it here one.

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Let's put here for let's change this one.

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Add a couple of things here, and that's pretty much it.

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Now, if you put a semicolon, there comes a log.

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This entire area, you will see that we do have.

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We do have array of length three, but we do have inside three objects and now I do see their indexes.

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So how I will access these subject count for well, first I need to know the name of our array, so

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I'm going to do it here again.

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Right then in these square brackets, I'm going to define the index of this guy here that has four subjects.

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Right, because we said that we I'm going to grab the subject come from that guy.

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So, number one, it's in index one.

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Now, I just want to get this subject count.

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So that subject count in that is pretty much it.

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Very good.

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Now, let me counsel like this for you guys.

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Put a semicolon there.

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And this is to get whoops, get the subjects count of an object inside an array.

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Nice.

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So this is how we can define objects inside array.

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And before that, this is how we can define array inside an object.

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And it's a little bit different how we access them.

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But it's pretty much self explanatory.

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Right.

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I also want to mention of functions that can be defined here inside an object.

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Now the functions define an object.

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They will be called methods so these student object can have access to its own methods.

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Now let's create a method called pick and loops, and that will be a function, right?

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Curly brackets.

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And inside just comes a log paid.

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An exclamation mark.

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So that means that a student paid its own tuition fees right now, that is very good.

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So student has access to its own method called paid.

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And we are not going to call them functions because their methods of this student object.

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So how we can access this?

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Method, so student name actually the name of the student, right?

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This is the student object that dot.

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Eight, and because it's a function we need to use these this brackets, yeah, and if we have arguments,

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we need to pass some arguments to save this one.

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Go back to your browser.

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And here it is.

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We do have the page printed out for us.

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Now, this leads us to something very interesting.

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And I just want to discuss about another JavaScript that called now.

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So this will be another JavaScript app that we're going to cover.

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And we were not able to cover it until now, but it is called now.

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So let's first talk about an empty object.

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So last lecture, I show you that we can have an empty.

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All right, well, let's create var.

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Empty.

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All right, that will be equal to.

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So we just declare an initialised of the durry, but we not have any data inside.

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So that is called Materi, an empty object.

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And also the object can't be defined with this curly brackets.

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Right.

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Let's call the lock both of them now.

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Empty object first.

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Ordinary doesn't matter.

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Let's do them in this order.

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Console that.

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Lock an empty object.

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Oops.

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Save it, go back to your and now you do have Lenkov zero and nothing inside of the object, so why

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you will ask yourself what?

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Why we need why we will need an empty objects or an empty array?

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Well, imagine that we have a function that will take these two objects and it will fill them inside

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the function.

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So let's create a function called field function while you can create a better name for this one.

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And inside I will say empty object that name.

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So we'll give it the name to Rick.

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No empty array.

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Let's put push here, let's push an item inside the array and the item name will be James.

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Nice.

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So we need to call the function field function.

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It doesn't take any parameters.

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Again, we need to call the lock the both of the race.

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So now they were empty before.

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Now we create a function that will fill them.

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So this function can do anything to them, can create can feel not just with name.

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It can have like the student, like age or with the array.

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We can push more items inside and we can save it.

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Now we have array over one item.

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Right, and its index is zero and we have an object with property name and value, Rick.

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So that is how we can use these empty objects.

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But now, see, sometimes we need an empty array and empty object to declare outside here.

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That's why we declaring them outside.

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The function, and this is called a global scope, but because we can access these objects anywhere,

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even inside the function.

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That's why we define them globally here.

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If we define them, these two inside here to function, then we will not be able to access them outside

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the field function.

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Do you understand?

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That's it's called that is why this is called global scope here.

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Everything that we going to define globally, we can access them even inside the functions or outside

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the functions, it will work.

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So that is why we define them as an empty outside.

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So on the other hand, this leads to a very interesting and unique JavaScript type called Now and so

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let's set new object to null and.

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This will be a new JavaScript app called Now and We're Here, we will say var no object and that will

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be equal to now.

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So we can set the object now and let's give an object and age.

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So no object or just a name.

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That name.

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And it will be equal to Rick.

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Save it and cancel that lock null object.

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All right, so what do you expect to see?

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They expect to see now null object feel with the value?

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Well, this will throw us an error and it's a card type error.

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Cannot set property name on.

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No.

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And why is this so now, objects returns, no value, the no value, the value now represents the intentional

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absence of any object value.

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It is one of the JavaScript primitive values, and it's treated as falsey for boolean operations.

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And we will have use cases for this.

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And it's hard to wrap your head around at this stage, but it will be OK.

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We will handle this in the future.

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But as you know, the value now represents the intentional absence of the object value.

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So when we define something like this to be null, then we do it this intentionally, right?

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OK, now we will define more we will create more meaningful examples of how we going to use.

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No, don't worry about it in future.

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But this is what now and this is another JavaScript type and you already see the empty one as cool.

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You see that?

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Let's go from top.

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Now you know how to create an object with this curly bracket.

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We have properties in names of the objects arrays.

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We have indexes here.

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We don't have it now.

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We can access it by using DOT and the properties here.

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Right.

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Also, the students can have an array of items and we can access them.

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Here like this.

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And actually, that was not that was for the studio sorry, where we here it is, right.

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Also, we can have a functions and the functions inside the objects are called method's.

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Now, we discussed about the empty objects or empty arrays and how we can feel them inside a function.

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And also we discuss about the no JavaScript type.

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And that is pretty much it for this lecture.

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Yeah, I'm sorry, it was super long, but I had to explain it because Java in JavaScript arrays and

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objects are very, very important and you will see in future YMC very important because our next exercises

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will be pretty much of with arrays and objects.

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And yeah, you will see what we can do with them.

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So stay safe and I will see you in the next one.

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Now.