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Welcome back, welcome to another lecture today, we're going to talk about JavaScript worries and about

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data structures.

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So JavaScript are one of the most basic form of data structures.

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OK, now, before I start explaining, just let's create the first array called first array.

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Wow.

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That's was pretty nice.

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So how do we know that we're creating a rate while we need to use this brackets, an inside array.

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We can have one.

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We can have zero or multiple items.

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Now, if we don't specify any items, this is only the declaration of an empty array.

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OK, now, but if we want to have items inside, we can have multiple items.

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In this case, I'm going to use three strings, so I'm just going to name them first.

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And they need to be spaced with the comma and third loops.

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Now you need to put quotes.

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So single quotes or double quotes will do a job, right?

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Very good.

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Now, these are called items inside the array.

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But how we can access them?

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Well, I'm just going to make your life easy and console that.

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Log the first array.

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Save it.

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Go back into the browser and there you go.

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So we have first, second, third.

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And the length of the entire is three.

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Now, look at this side.

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Well, we have here starts from zero one two.

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So these are called indexes.

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So our arrays are based on indexes.

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So they work.

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We starting from zero.

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That's why when we do the for loop, remember, we used variable AI to be equal to zero.

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So we initialize variable AI to to hold the value to start from zero.

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And why is this.

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Well now we can add, you will know because when we use an array we can print out probably this part

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now probably first element with using the index.

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So let's let me close this one because it's flicking all the time.

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Right, sorry about this, guys say that we don't need it now, how we got how I can access the first

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item of this array.

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Well, I do know the indexes, so cancel that lock first rate.

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I need to put the brackets in the position.

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Now, I know the position because it started from zero.

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OK.

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Very good first.

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Let me just right here, a common get the first first item from an array.

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Nice.

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I'm just going to copy this one and I'm going to do it two times.

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Second and third.

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Very good.

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Now.

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In order to get the second one you put here, sorry, one and you need to get the last one is the third

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you need to put here, too.

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Now, I have all of these items stored like this, but it's very good idea not to use guns a lot just

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to create the first variable with any name that you want and just put the first array of sorry of zero.

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Now, instead of counseling, log the first array.

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You can cancel out the first variable and you can reuse it later on.

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Right.

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So it will yield the same result.

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So let me just copy this one.

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Make a comment here coming out this one.

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And I'm doing this because you will know what we have done in the last second.

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And that will be the first array of.

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One and I'm just going to copy this here and let's call it third, and this will be number two.

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Very good.

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So I'm going to cause a lot better.

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And also I need to do the same with the second one.

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Nice.

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Very good.

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Save it.

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Now I have the same results.

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Oh, yeah, we spent a little bit time of explaining this, but it's all good now.

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The arrays, we can store multiple values, but can we store a different data in JavaScript types?

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Yes.

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And we can store any data, any JavaScript type that we want.

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And that is called a mixed theory.

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But it's never good to have a mystery.

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Why?

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Because the data structures are all about relationship between those data that we put inside.

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Right.

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So we can it's going to be easy for us to navigate through that data if we use something like this,

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if we use aree, that is with strings or if you use array of numbers.

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OK, now let's create this mystery.

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VAR.

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Mix, all right, and now this array can hold one to three.

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For right, true, false, so it can have no strings booleans.

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And also we can have a function.

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So function makes very good counsel that law makes.

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How cool is this now the function can have oops, I didn't call this function console the lock makes.

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All right, very good.

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And now we have seven items.

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We do have one, two, three, their numbers and their blue four.

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Then we have boolean values, four and five.

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This is a string and we have the last one.

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It's function, right?

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Oh, good.

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Now you know that the mixed array can have a different JavaScript type.

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Very good.

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Now, what is something else that I want to show you?

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Well, now you know how you can create a mixed array.

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So let's move on to something more interesting and an array can have.

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Inside another arena, and that is very interesting.

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For example, let's create a reservoir called Inner Oray or are only that is a short version.

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Now here I'm just going to say, Rick, and inside I will have another array with my details.

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For example, one, two, three, four or five.

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That will be, for example, student I.D. Then I will have a place of living or country.

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But in order to specify another array inside this array, you need to use again these brackets.

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Let's a the NRA and see what I will have.

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Very good.

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Now here say that I have Rick as a string and then I have array of three elements.

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Nice.

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So if you go like this on the first position, I will have that array.

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So for example, if I want to grab that Inari or.

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Einar Oray or just Nuray here, I'm just going to call it Nuray, very good.

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And I want to grab only this one.

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So how I can do this Inari of a position one, because in that position, that is the position where

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this Inari is stored on index one.

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Very good.

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So if I can't log the new array now, I will have the only one single array here.

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Very good.

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Now, basically what I can do, I can just grab any item from here based on the position zero one,

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the three.

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But even here, even if I don't save it anywhere, I can still grab it.

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For example, the Inari.

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So I'm going to say, let's grab Malbon here.

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Right.

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Let's find Nadelberg.

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From the inner all right, very good.

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So how we can do this without storing this to a new array?

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Now I'm just going to the console boops.

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Because I use caps, caps, lock, cancel that lock and let's start like this in hurry again and it

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will give me this.

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Now I just want to access the number one.

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Very good.

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Save it now, it will get me the entire array, you know, I can just click here and see that the Melbourne

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is on position one, so how I can get that position while here I can put another pair of bracket and

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put number one and let's save it.

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Now, I do have the item called Mount Melbourne.

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Nice.

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So we can practice this one.

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And it's very easy to understand.

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Now JavaScript comes with predefined methods or for the arrays and we can use them straight out of the

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box.

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Well, for that in order to show you J.S. predefine.

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Methods.

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Well, I need to create an array, for example, colors, and this will be a little bit of writing for

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me.

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The second will be orange.

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The third will be blue.

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Then it will be brown.

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The four will be black.

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They will start with be then yellow.

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Then I will have a green color in the last.

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I want to have a purple.

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Very good.

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Now I will use let's cancel the lock the array to see what's happening.

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Cancel the log the colors.

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That's the name of the race and color.

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And I do have the entire holding eight items starting from position zero or index zero.

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So first method that I want to show you, it's called shift.

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And what does this shift means?

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She will remove the zero index from this array.

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So the zero is red.

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OK, so how I can use this method.

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So I need to use colors, the name of the array then shift.

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And because it's a method I need to use.

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These brackets save it, do it like this, console the log.

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Remember that you need to lock the not console colors again Durry in order to see the changes.

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And voila, I do have seven now in the red is missing and orange became zero.

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And before I have.

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Oops.

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Before I had.

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Right to be zero, right, and shoot, we should have here the red as a zero and I'm not sure why it's

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not checking out doesn't matter.

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So the orange now became zero.

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And it's not the red is not in the items in here.

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You can see the size.

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It's seven.

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Very good.

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Now, let's cut this one from here and test it out a little bit and see what will happen.

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So if I just you don't need a semicolon inside.

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So if you save this one and go back now, it will give me the red or the item I just removed from the

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or the item that I shift or remove.

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Take it out from here from this array.

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So this give me an option for for me so I can create a variable color red, because I know that the

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red is the name of the first item and I can just do this, save it here.

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Very good.

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Now in that very old red it will hold the item.

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So if I do right now again, I will have the value or what is stored from this function.

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So now just print out the colors again.

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So now I take one item, but I also store that item here just in case I will need them in future.

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Very good.

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Another method that I want to show you is called unshaved.

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So these methods will add a new item at the beginning of the array, or it's totally opposite to the

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shift one.

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Actually, I'm just going to copy the entire one, just going to put it here and shivved will be on

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shift.

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Very good.

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So Koller's unshaved and now what item I want to put here.

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So this should be on shivved.

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Good.

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Now, fully unshaved, we need to specify what we want to put in the beginning of the array.

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Well, I just want to put the item that I just remove.

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Let's see if it's going to work.

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Nice.

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Now, I do have a seven with the shift and now I do have back the entire array.

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Also, what you can do, you can make a comment here and seeing here a shift and this one saying on.

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Shift.

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Also, make sure that you put a comma there.

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So shift.

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Removes one item, unshaved adds item, and we added the same one that we just remove.

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Very good now.

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How we can remove the last element from this array, for example, the purple, well, there is a function

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for that or a method called.

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But.

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So we're going to use the pop method to remove the last.

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Item on the array now, what are we going to do here?

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I'm going to say colors, dot, pop.

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And cancel that log and we'll say pop hooks and colors again, we need to print out the array in order

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to see if it's working.

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Well, I do have seven and I don't have the purple anymore, and that is great.

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But also, pop, it pops the item from the array and I can store that one as last so far purple.

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Very good.

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So now we just removed and also we store this one.

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So if you want to make sure that the correct Color Purple is there, just cancel that log the purple

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variable.

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OK, let's see where we get.

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I do have the purple now.

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I'm good to go.

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So it's always good to store whatever you are popping or shifting.

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So in future, if you want to return them back, you can right now.

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If you want to return this item, we can push this one back to the rate so we can push anything that

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we want, but this will add the new item at the end.

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So logically is to push the proposal back.

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Very good.

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I'm just going to copy this one here.

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And I'm just we don't need this one anymore.

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We don't need this one anymore.

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But we need to use the push method.

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And the push method requires an argument.

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Which argument is that?

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The variable from here now this will be push.

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Very good.

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Now, I do have my original Ari back because I first we shift one, then we on shift that one, then

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we pop the last one, then we return that one to the push method back to its place.

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Very good.

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So we have learned a couple of methods.

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Now, another one that is very interesting is and it's very vital everyone is using it's called sword.

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Now we can sort the array so collars lets me control that lock collars, that sword and that is pretty

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much it.

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You need the brackets there.

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Let's put it here.

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Comment sort, because we do want to know what we are doing.

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Very good.

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Now Sword and we do have black, blue, brown, green.

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These are sorting alphabetically.

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Good.

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So one couple of more things that I want to show you is that we can concatenate on arrays, same as

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we do.

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We concatenate strings, we can concatenate arrays.

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Well, let's do this.

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I want to add pink to this array.

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So how can do this, let's say concat here now colors that concat here it is the method and I can add

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pink.

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Save it.

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Cancel that log.

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Colors now they should add a pink.

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Wait, here it is now, let me just make sure that I use concat.

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Here and now it's going to be more real, but what is happening, where is the pink?

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Well, the pink is not there.

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Why?

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Because we just can't get the colors with the pink, but we never save it or store it in these colors.

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So the solution is very easy.

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So what I can do, I can say I'm just going to comment this one out and I'm going to copy it.

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Now, in order to save it, we need to use colors equal to colors that concatenating now in this array,

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in the region rate that I have here, I saved a new one with the pink color inside.

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So save it and I'm just going to print it out.

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And there you go.

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Now, you do have the pink color there.

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And that's it for this lecture, ladies and gentlemen.

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So if you want to if you don't if you didn't understand some things, just go watch this lecture again.

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But this is pretty much it there.

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More more of these methods.

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But I can't do all of them.

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So what you need to do is pretty much go to V three schools and just find or research about other methods

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that we can use on arrays and a predefine.

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Now, do the exercise.

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It will require you to do a little bit of searching online and that's the goal so you can find more

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things in practice.

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So I will see you in the next one.

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Sorry, this was super long, but it had to be done by.