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Let's get started with the math object.

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I have already created a new folder and have named it as math object and I have two files, my HTML

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and my JavaScript file and I have linked up my JavaScript to my HTML down below.

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Okay, good.

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So let's get our hands dirty with the math objects.

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Now we have empty JavaScript file.

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All right, so let's get started with the math object.

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Where the math objects functions are easy to understand.

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So I'm going to explain it in one single video and the challenges comes in when we put them into use

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cases.

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So you are going to have a lot of coding challenges after I exploit you the meaning and when to use

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this map functions.

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So the first one that we will talk about, so let me comment here and say math functions.

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Or object.

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So the first one that you would talk about is what you call moth dot absolute.

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So like I said, the PDF guy, we provided an order description to be inside the PDF.

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So the first one we would talk about is moth dot absolute.

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Then it takes in the number that I want to have the absolute.

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Oh.

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So what is the moth that absolute.

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Well it retains the absolute value.

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And that is only positive numbers will be retained if you pass a negative number to see positive.

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So let's have a look.

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So let's assign a variable called, let's say answer is equal to none.

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I'll in math, which is a global method built into the browser.

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So you see that I have it as that this object is not me or you who made it, so I'm going to use it.

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It's a built in method.

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So if I make use of dot, you see, I have all the functions or methods that we can use to operate on

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Mathematica operations.

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So what I want is a base meaning the absolute.

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Then I pass in the number I want to have observed with.

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So let's say I want to pass in ten.

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You get it?

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So I'll come down here and console that log and sum.

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So if I check the console, have a look.

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Indeed.

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We have ten.

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What about if I put negative here?

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You see that I still have ten.

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If I add, let's say sorry if I say 10.1, see that I still have 10.1.

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If I add any number to it, I still have it.

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So the is retains what the absolute value of the number and that is it about the math dot absolute.

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So again, let me comment this one.

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The next one is what you call moth dot round.

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The name is even descriptive, which is moth dot round.

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So it is used to retain a value of x rounded to the nearest integer.

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So here we go.

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So the same way counts as say, my answer is equal to math dot round.

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If I pass in, let's say 5.5, if I save it, we see that I have C's.

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It has rounded to the nearest whole number or integer.

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So if I pass in, let's say 5.1, you see that it ignored one because it is not up to five.

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If I pass, let's say four.

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I see that I still have four.

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I still have five, but if it's more than five or equal to five is going to run it to the nearest integer.

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So this would be six.

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That is the round for you.

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The next method of function is called C0.

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Great.

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So let me copy this one.

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Let me copy this one here and now.

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Paste it here and change this one.

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Let me comment this one now.

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This is called SEAL.

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We still have the math object.

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So what does the seal mean?

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Well, it retains the value of X rounded to the nearest integer.

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So let's have a look at differences here.

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All of these ones returns to the nearest integer.

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That is a round.

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But let's have a look at the round.

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If I save this one, you see that?

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Well, I got six.

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Okay, so what about if it is less than five?

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Let's see one.

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But after it has, what, round to six?

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You see that?

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So it doesn't take whether the decimal places is less than or equal to five.

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As soon as you see decimal place, less than zero is going to run into the nearest whole number.

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That is one trick about that.

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Okay.

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The next one is going to be what is called flow and this one is commonly used.

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So you also commonly this you.

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Sorry, I see you.

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Okay.

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So let me copy this one.

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Come down here, paste it.

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And now this is called the floor.

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We are going to floor you.

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Okay?

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Comment this one.

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And here we change this one to floor.

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Okay.

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So if I save this one before I save it, let me explain to you what is the floor?

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The all retains the value of x rounded to the nearest integer.

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But the cool thing is that there are some special use cases here.

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If I save this one, you can see that I got five again.

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Ideally it makes sense because one is less than five.

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So if I add even two here or three here is still five.

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To me, this one makes sense.

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But what about if I add five?

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Well, it's two.

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Five.

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What about I put nine?

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Well, it's two five.

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So this one, it doesn't take the decimal place into consideration whether it's less than or equal to

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five or more than five.

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It doesn't care.

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When we come to money issue, I don't use floor, but it depends on some use cases whereby you don't

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care about decimal places.

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So this one will change the whole number, whether it has a decimal place or not.

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That is flow for you.

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All right.

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The next function is called math dot square root s q r t.

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So let me comment this one out here.

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Okay.

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So this one has made me remember it way back high school.

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Do a mathematical class, a question like, Can you find me a square root of two or 25?

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Well, so it is a time.

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So after you've gone through this, you can create your own application to perform mathematical calculations

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like this, operations like this ones.

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So here all I need is I'll pass in a dot zero alt square root.

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So what would be the square root of five?

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I guess it's simple mathematics, right?

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Before I save it, it's going to be what, square root of 25?

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Well, I think this one that makes sense to me.

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Well, what about 25?

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What, about 36 going to be six, right?

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Yes, six because six times six is 36 and you're going to be 25 two.

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Five times five is what 25 is going to be five.

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That is correct for you.

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So we can create a simple application just to find a square root of any number, whatever.

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If I ask you to find the square root of, say, 1.8888444333.

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Can you tell me at a spot?

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Nope.

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But for this one, if I save it, I get the answer, which is

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1.37435236868133649.

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Is it?

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So for this one, we can run it up to the nearest whole number by using flow to get only one if you

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want.

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In that way, why not?

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We can go back that way.

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That is square root for you.

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Okay, so let me bring it back to 25, which makes sense in a normal sense to me here.

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So what about the next method is what we call OC.

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Find the power of accession number.

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These are all, I mean, high school mathematical operations.

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So let me copy this one and then come down here.

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Let me comment this one out.

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Now, here we go.

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This is called the power.

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Find the power of two numbers.

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Okay.

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The cool thing about the power here is that this one takes into argument.

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Let's say you want to find two.

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Power three.

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What does it mean?

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22% means that.

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Let me show you.

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Maybe if some of you have forgotten.

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So let's say that I want to find.

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I mean the power of two.

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Power three.

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Let's say two.

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Power three.

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Like this.

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One, two.

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Part three.

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Like this one.

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What does it mean?

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This means that multiply two three times, you're going to be two by two by two.

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If it is ten, multiply two by itself ten times.

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That's the square root.

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The power.

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Sorry.

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So here we're going to pass in two arguments.

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Let's say two, comma, three.

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This means that to power three, it's going to be eight, right?

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So two times two times two is eight.

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So let's save it.

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And indeed I have eight.

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That is that.

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The next one is what we call the minimum.

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For example, I like this method a lot.

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For example, if we have some arrays of numbers, I ask your place, can you find me the minimum number

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in this particular array?

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Do you remember in our previous coding challenges, we have some scenarios like this whereby I ask you

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that find me the minimum number of two, a minimum number between numbers or a of numbers.

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So it is a time.

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So here, let me copy this one.

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And now come down here and commit this one out and this one just type in min.

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And if we see the IntelliSense, we have min value and two values, one one here and then retain the

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smaller of the set of supplied numeric expressions.

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The name is in descriptive here, so return the minimum value provided to this function.

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If I save this one, these two which are which of these is a minimum or the list if I save it?

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Indeed it going to be two.

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Yes, indeed.

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Whatever.

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If I pass in, let's say nine and negative two is negative two is a minimum number among these two.

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So we can work on array than just providing these two.

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I mean, numbers, that is a mean for you.

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What about the maximum it returns, the maximum number provided.

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So if I change this one to maximum the same process, I get nine because nine is larger than negative

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two.

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The next method is what you call the random.

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And this method is really crucial because we can make a lot of use cases out of it.

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This is maximum.

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Yeah, and this is random.

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So for this method we can create awesome guessing game applications and which are times two.

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This method is being used to generate, let's say, token or code when trying to log into application.

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That maybe five digit code has been sent to your email.

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Please check it out.

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It's been done using the moth dot random.

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So let's see how you're going to do this one.

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So moth dot random.

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I mean, generate random numbers between two numbers.

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Okay.

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So let's say that I want to generate random numbers for this one.

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All I need is that I'll just bring in random as that.

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If I do this one, I save it.

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Now, if I console.log the answer, let's see.

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We're going to be any time I refresh the page, you see that I get different numbers in the console.

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That's the beauty of it.

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That's the beauty of it.

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So for this one, by default, by default, it's from 0 to 1.

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And these are inclusive from where 0 to 1, zero is exclusive and one is between zero and one meaning

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you cannot get up to zero and you can never get to one.

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Okay, so let's see this by default.

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What about if I want to provide my own random numbers between, let's say, two values, let's say get

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a random numbers between ten, five and ten or 20 and 30.

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How are you going to do that?

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This task at first glance is going to be a little bit worth to you, but just pay attention and you

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can receive the formula.

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Anytime you want to get something of that sort, just make reference to it and that is it.

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So let's say that gets random random numbers between.

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Two numbers.

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Yes.

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So let me have enough room here because it is very important.

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So let me comment this one here for now.

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Great.

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So now here we go.

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Let's have let's look at the syntax, how we can get I mean, random numbers between two numbers.

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Good.

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So the alternative is that you bring in math like that.

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Let me have a comment that will not have something like this one.

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So you bring in the math dot random like this one.

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Okay, math that random.

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And then you're going to multiply that one as a function like this one.

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Then you multiply by the maximum minus minimum plus one and then plus the minimum.

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So so this one, it goes like this one I'm going to subtract.

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I'll bring in mine parentheses.

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Like this one, and then I would take my maximum minus minimum, then I would add plus one and then

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a plus one here, and then I would add plus my minimum.

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So this is a formula to get random numbers between two numbers.

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So again, the maximum number minus the minimum number plus one and then plus the minimum number.

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Let's have a look.

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For example, let's say example here, example, let's say that gets.

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Random numbers.

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Between.

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Ten and 20.

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So let's see how we're going to do this one.

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So I would say const rant random is equal to.

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Remember our being in first of all my math floor which is math.

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Sorry, random math, but random as my function call.

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The next one is how multiply my multiplication sign like that.

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And next is this syntax.

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My parentheses max minus minimum plus one.

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So here we go.

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Is going to be maximum the maximum, which is, let's say 20.

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Right?

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We go here and then minus the minimum and then plus one.

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Then I will add my minimum, which is ten.

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So we can create a function to make it more dynamic and we get back to that very soon.

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All right.

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So let's cancel out the random number here as round.

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Okay, so I got 13.59 and the decimal places.

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So let's say like you don't want to help the decimal places, you can use the floor method to floor

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and get a whole number.

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So here I'll cut the result and pass into that floor.

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Remember the floor?

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What it does do not pass in my random number.

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Then I get a whole number upon every random numbers.

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That is it about the the minimum.

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Sorry, the random function or method.

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So with this one, I will simplify it in nice way Lacey.

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I'll just pass in the so I'll copy this one.

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So this one the same thing as by passing everything inside math dot floor.

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Then I'll paste my logic inside and then I can remove the floor from here like that.

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And then I have it so the same as before.

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This syntax is what you are going to see most in some code.

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All right.

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Now that we have the overview of some of the methods in this video, let's get started with our coding

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challenge.