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Okay, so let's get to work.

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So number one is creating

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an object

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00:00:08,340 --> 00:00:10,260
for each of them.

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So object

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mark.

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So full name property, Mark Miller.

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Then the mass, which is 78 kilograms.

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And then the height,

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which is 1.69 meters.

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So that's it for now.

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And now I'm just gonna

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copy this.

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As always, I'm a bit lazy

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and that's just how programmers are, I guess.

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So John Smith

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and he is 92 kilos

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00:00:54,360 --> 00:00:57,903
and 1.95 meters tall.

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Okay, so that is point number one.

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And now we will create the calcBMI method

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And then a function

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without any parameters

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because we will take the data

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directly from the object

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just like we did it with the calcH method previously.

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And remember that it says here

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that we should store the BMI value

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to a property

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and also return it from the method.

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So this means that we will do

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this.BMI

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and then do the calculation here.

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And remember from the formula the BMI is calculated

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by this.mass

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divided by

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00:01:46,890 --> 00:01:49,770
this.height

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squared.

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So exponentiation operator

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with two

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and then also return it.

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So this.bmi

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00:02:02,337 --> 00:02:05,742
and just to see if this actually works

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let's actually call this method.

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00:02:10,175 --> 00:02:12,780
So mark.calc.BMI.

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00:02:12,780 --> 00:02:15,990
And now I will quickly lock to the console

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00:02:15,990 --> 00:02:18,330
the property that we just created.

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So I could have locked

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this to the console directly

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00:02:22,410 --> 00:02:24,513
but I want to do it this way now

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00:02:24,513 --> 00:02:26,790
and it doesn't really matter.

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00:02:26,790 --> 00:02:29,290
So with this, remember we created

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00:02:30,270 --> 00:02:32,310
a property called BMI

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00:02:32,310 --> 00:02:35,010
and so that is now of course accessible here.

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So mark.bmi

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because remember

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that here in this method

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this now points to mark

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because that is the object

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that is calling the method

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and therefore this.bmi will be on mark.

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So mark.bmi equals mark.mass

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divided by mark.height.

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And so that's how we get this data

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into this method.

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Alright,

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00:03:05,843 --> 00:03:07,290
so that's essentially what we learned

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00:03:07,290 --> 00:03:08,730
in the last lecture.

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00:03:08,730 --> 00:03:10,200
And so here I'm doing the same.

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00:03:10,200 --> 00:03:12,330
I'm first calculating this value

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00:03:12,330 --> 00:03:14,910
and then I'm doing mark.bmi

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00:03:14,910 --> 00:03:18,027
which was added here in this method call.

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00:03:18,027 --> 00:03:20,880
Of course, without this method call

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00:03:20,880 --> 00:03:23,640
mark.bmi would not be available

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because this method here

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doesn't call itself.

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00:03:26,250 --> 00:03:28,173
We need to explicitly call it.

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Now console

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00:03:31,830 --> 00:03:33,743
ah, missing the .log.

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00:03:33,743 --> 00:03:37,630
How can that still happen after all these years?

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00:03:37,630 --> 00:03:41,304
Okay, so here we get the BMI of 27

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00:03:41,304 --> 00:03:44,400
which seems about right.

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00:03:44,400 --> 00:03:47,400
And now as I said, we will simply go ahead

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00:03:47,400 --> 00:03:49,050
and copy this method

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00:03:49,050 --> 00:03:50,440
exactly the same

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00:03:51,390 --> 00:03:54,360
to this John object

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00:03:54,360 --> 00:03:55,440
and it will work

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just the same, believe me.

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00:03:57,646 --> 00:03:59,823
So let me show that to you.

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00:04:01,260 --> 00:04:02,516
So now

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00:04:02,516 --> 00:04:04,200
we call

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00:04:04,200 --> 00:04:06,630
john.calcBMI.

92
00:04:06,630 --> 00:04:11,010
And so now the object calling calcBMI is John.

93
00:04:11,010 --> 00:04:13,080
And so now in this method here

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00:04:13,080 --> 00:04:16,410
this will point to the John object.

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00:04:16,410 --> 00:04:19,290
And so this time John.bmi will be

96
00:04:19,290 --> 00:04:23,313
calculated using John's data of mass and height.

97
00:04:24,480 --> 00:04:25,440
Okay,

98
00:04:25,440 --> 00:04:27,720
are you still following that?

99
00:04:27,720 --> 00:04:29,771
As always, you can pause the video

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00:04:29,771 --> 00:04:31,957
analyze the code on your own

101
00:04:31,957 --> 00:04:34,056
or you can always rewind

102
00:04:34,056 --> 00:04:36,870
to hear the explanation again.

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00:04:36,870 --> 00:04:38,580
I actually like to do that myself

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00:04:38,580 --> 00:04:41,569
when I watch other online video courses.

105
00:04:41,569 --> 00:04:44,827
So I think that's a good tip maybe.

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00:04:44,827 --> 00:04:47,700
Anyway, so we just calculated

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00:04:47,700 --> 00:04:50,269
the BMI of John here as well.

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And so now I'm logging

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both to the console.

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And so yeah,

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00:04:54,928 --> 00:04:57,218
this one also looks correct.

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And so this means that simply copying this method

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from one place to the other

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actually makes it work

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00:05:04,323 --> 00:05:08,067
and adapt to the data of each object.

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Now having the exact same code

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in both of these objects

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kind of violates the don't repeat yourself principle,

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right?

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And actually there is a way

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in which we can avoid this.

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And of course we will learn how

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at a later point in the course

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using something called

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object-oriented programming.

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But for now we are still learning the basics

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and just want to make things work

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and of course have some fun along the way.

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So this was the hardest part

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I believe at least.

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Now all we have to do

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is to write this string here.

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Let me actually copy the example

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so we have it

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as a reference down here.

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Otherwise I'm gonna get a bit lost.

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So if mark.bmi

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is larger than john.bmi

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then console.log.

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00:06:10,987 --> 00:06:15,987
So let's get the full name now from the object.

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00:06:16,590 --> 00:06:17,590
So mark.fullNameBMI.

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00:06:21,120 --> 00:06:22,890
And now we also

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00:06:22,890 --> 00:06:25,350
need it here in these parenthesis.

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So let's put it there.

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mark.bmi

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00:06:30,150 --> 00:06:30,983
is

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higher than

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00:06:34,500 --> 00:06:36,783
and now let me just copy it here.

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So

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and again I'm using command D

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00:06:43,290 --> 00:06:45,480
to select the next occurrence.

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00:06:45,480 --> 00:06:48,990
And then let's just replace it with John.

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00:06:48,990 --> 00:06:52,743
So Mark's BMI is higher than John's bmi.

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00:06:54,570 --> 00:06:56,553
And now let's grab this again.

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00:06:57,450 --> 00:06:59,350
Else if

156
00:07:01,110 --> 00:07:02,710
john.bmi

157
00:07:03,984 --> 00:07:04,817
is larger than

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00:07:06,499 --> 00:07:07,600
mark.bmi

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then essentially say the opposite.

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So here it's gonna be John,

161
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and again

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command D

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00:07:18,870 --> 00:07:21,840
and here, it's gonna be Mark.

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00:07:21,840 --> 00:07:22,863
Okay,

165
00:07:25,410 --> 00:07:28,230
so 27 is higher than 24

166
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and that 27 belongs to Mark.

167
00:07:31,860 --> 00:07:35,940
And so this seems to be about right

168
00:07:35,940 --> 00:07:37,830
but it's not completely right.

169
00:07:37,830 --> 00:07:39,150
So ah,

170
00:07:39,150 --> 00:07:42,120
of course here it should be lowercase.

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So bmi.

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00:07:43,830 --> 00:07:46,500
And now I cannot use the command D

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because then it will select this one as well.

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So I'm double clicking on this one

175
00:07:51,690 --> 00:07:54,510
and I hope that you're finding these vs code tips

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useful as well.

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So I'm clicking

178
00:07:57,780 --> 00:08:00,690
or actually I'm double clicking on this one

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00:08:00,690 --> 00:08:03,330
then I hold down the command key,

180
00:08:03,330 --> 00:08:04,920
which in your case might be

181
00:08:04,920 --> 00:08:07,770
the control key or maybe the option key.

182
00:08:07,770 --> 00:08:09,570
So I know there are different configurations

183
00:08:09,570 --> 00:08:10,680
for this

184
00:08:10,680 --> 00:08:12,570
and it might not even work for you

185
00:08:12,570 --> 00:08:14,910
so please don't ask

186
00:08:14,910 --> 00:08:16,740
any question in that case.

187
00:08:16,740 --> 00:08:17,573
But for me

188
00:08:17,573 --> 00:08:19,200
I just have to hit command

189
00:08:19,200 --> 00:08:20,490
and then I can double click

190
00:08:20,490 --> 00:08:24,660
on multiple words and then all of them get selected.

191
00:08:24,660 --> 00:08:27,030
So now I have these four multiple cursors here

192
00:08:27,030 --> 00:08:27,960
again

193
00:08:27,960 --> 00:08:29,874
and I can simply delete all of them

194
00:08:29,874 --> 00:08:31,327
and write

195
00:08:31,327 --> 00:08:34,010
the one that I'm interested in.

196
00:08:34,010 --> 00:08:36,715
So that's the lowercase bmi

197
00:08:36,715 --> 00:08:39,832
and now we get the correct values

198
00:08:39,832 --> 00:08:41,586
and also this

199
00:08:41,586 --> 00:08:43,162
conditional logic

200
00:08:43,162 --> 00:08:45,487
is correct as well.

201
00:08:45,487 --> 00:08:46,620
And so with this,

202
00:08:46,620 --> 00:08:49,205
we did actually solve the challenge.

203
00:08:49,205 --> 00:08:51,903
And with this we also finished this introduction

204
00:08:51,903 --> 00:08:54,630
to JavaScript objects.

205
00:08:54,630 --> 00:08:55,620
And once again,

206
00:08:55,620 --> 00:08:57,870
I really want to congratulate you

207
00:08:57,870 --> 00:09:00,281
for the progress that you are making here.

208
00:09:00,281 --> 00:09:03,330
Great job and really well done.

209
00:09:03,330 --> 00:09:04,470
And I really mean it

210
00:09:04,470 --> 00:09:06,600
because I know how hard it is

211
00:09:06,600 --> 00:09:08,040
to stick to a course

212
00:09:08,040 --> 00:09:10,164
like this and to learn a completely

213
00:09:10,164 --> 00:09:13,081
new thing that is probably a bit confusing

214
00:09:13,081 --> 00:09:15,168
for you at this point still.

215
00:09:15,168 --> 00:09:16,503
Just keep in mind

216
00:09:16,503 --> 00:09:19,929
that that is absolutely no problem at all.

217
00:09:19,929 --> 00:09:22,830
And actually in the next section

218
00:09:22,830 --> 00:09:24,420
I believe I have a video

219
00:09:24,420 --> 00:09:25,637
about how to learn,

220
00:09:25,637 --> 00:09:27,701
how to learn basically.

221
00:09:27,701 --> 00:09:29,677
So about learning how to code

222
00:09:29,677 --> 00:09:31,201
and there's a lot of great tips

223
00:09:31,201 --> 00:09:32,568
that I'm sharing there.

224
00:09:32,568 --> 00:09:33,906
So once you reach that,

225
00:09:33,906 --> 00:09:36,112
make sure to watch it carefully.

226
00:09:36,112 --> 00:09:37,563
But now anyway,

227
00:09:37,563 --> 00:09:39,926
I will leave you to review this lecture

228
00:09:39,926 --> 00:09:40,759
if you want

229
00:09:40,759 --> 00:09:42,591
or to move on together with me

230
00:09:42,591 --> 00:09:45,510
to the next video where we are now

231
00:09:45,510 --> 00:09:48,063
gonna start talking about loops.