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All right, I hope you managed

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to complete all the three points of this challenge.

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And so here is how I would have implemented it.

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So I'm starting with number one, of course,

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and so let's say, const massMark

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equals 78.

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Okay, so that's just what is written here.

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And then heightMark

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equals 1.69.

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And then the same for John,

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so massJohn equals 92,

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and then heightJohn equals 1.95.

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All right?

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And if you used different variable names,

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that's not a problem at all.

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As long as they are nicely descriptive

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like these ones here, you're gonna be fine.

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Also, you might have used let here instead of const

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because you might assume

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that these are values that are susceptible to change,

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especially here, the mass, right?

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However, I still decided to use const

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because I already know

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that I'm not gonna change these values here

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throughout the program.

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And so just as we learned before,

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I prefer to always use const by default,

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and I advise you to actually do the same, okay?

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Anyway, let's now calculate the actual BMIs.

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So const BMIMark

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equals massMark divided...

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And let's check out the formula again,

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divided by the height squared.

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So that's gonna be heightMark squared.

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And then the BMI John,

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so that's massJohn,

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and this time, let's actually use the other formula.

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So this one here.

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So we're gonna use

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heightJohn times heightJohn again.

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Okay, and now let's log both of them to the console here.

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So BMIMark and BMI John.

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And now we have an error here.

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Oh, of course, I missed the .log.

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Okay, try it again.

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And here we go.

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So we see that BMIMark is higher than John's BMI.

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Okay, so I hope you got the same numbers here than I did.

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And if not, I guess you should probably check your code,

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unless I have some mistake here.

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Let me check that actually.

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But I think everything is good.

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Okay, so if something is wrong,

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then please just let me know, all right?

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Now, if you implemented this in a different way,

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for example, you might not have created these

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separate variables here.

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then that's not a problem at all, okay?

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You could have logged these calculations

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straight to the console, no problem at all.

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Again, what matters here is that you make this work

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and that in the end, you get these same results here.

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Anyway, let's now also do step three

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and create a variable called markHigherBMI.

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So let's just grab this here,

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and const.

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And so what we're trying to figure out

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is if the BMI of Mark

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is higher than the BMI of John, right?

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And so that's what comparison operators are for

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because remember, that this one here

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will return either true or false.

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In our example, if BMIMark is larger than one of John,

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then the result of this whole operator here will be true

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and otherwise, it's gonna be false, okay?

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So that's exactly what we did before in this example

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with the ages, if I remember correctly.

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So where's that?

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Ah, yeah, it's right here.

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In this case it was the isFullAge variable, right?

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Okay.

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Anyway, let's log it here to the console as well.

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And so we expect this one to be true, right?

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Because Mark's BMI is 27 and John's is 24.

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And so Mark's is larger,

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and so the result of this should be true.

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So let's check that.

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And indeed, we get true.

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Nice. So we basically solved it.

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Now I just want to do the same here for test data too.

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So I'll just copy this.

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So copy and then I will simply comment out these first ones.

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So now I'm replacing these with 95, 1.88.

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And then here for John, we have 85 and 1.76.

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And the rest of course is the same.

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And that's the beauty of using variables

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because now all we have to do

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is to change these values in one place

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and then the changes will be propagated

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to the rest of the code here.

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which references these variables.

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Cool. So let's reload.

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And now BMI of John is 27,

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so it's larger than 26.8.

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It's actually very close

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but still, BMIMark is now lower than BMIJohn.

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So here we, ask the question basically,

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is BMIMark larger than BMIJohn?

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And in this case, it's not,

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so it's false.

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And so that's exactly the result that we get here.

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All right.

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So this one is solved and I hope you solved it as well.

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Again, it does not matter at all

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if you did it in a different way,

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as long as the results were the same.

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So basically, as long as you actually made it work.

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So hopefully that was a lot of fun

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and you could practice your skills a little bit,

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which is really something essential

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to learn programming properly.

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Without repetition and reinforcing your knowledge,

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it's impossible really to learn how to coach.

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Anyway, see you now in the next video

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where we're gonna continue learning the fundamentals

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of the beautiful JavaScript language.