WEBVTT 1 00:00:01.050 --> 00:00:02.850 All right, I hope you managed 2 00:00:02.850 --> 00:00:06.990 to complete all the three points of this challenge. 3 00:00:06.990 --> 00:00:09.903 And so here is how I would have implemented it. 4 00:00:11.340 --> 00:00:14.970 So I'm starting with number one, of course, 5 00:00:14.970 --> 00:00:19.970 and so let's say, const massMark 6 00:00:21.450 --> 00:00:22.893 equals 78. 7 00:00:24.540 --> 00:00:26.973 Okay, so that's just what is written here. 8 00:00:28.448 --> 00:00:30.057 And then heightMark 9 00:00:33.720 --> 00:00:35.613 equals 1.69. 10 00:00:38.340 --> 00:00:40.770 And then the same for John, 11 00:00:40.770 --> 00:00:44.943 so massJohn equals 92, 12 00:00:46.350 --> 00:00:51.350 and then heightJohn equals 1.95. 13 00:00:53.370 --> 00:00:54.330 All right? 14 00:00:54.330 --> 00:00:56.610 And if you used different variable names, 15 00:00:56.610 --> 00:00:58.530 that's not a problem at all. 16 00:00:58.530 --> 00:01:00.720 As long as they are nicely descriptive 17 00:01:00.720 --> 00:01:03.480 like these ones here, you're gonna be fine. 18 00:01:03.480 --> 00:01:07.350 Also, you might have used let here instead of const 19 00:01:07.350 --> 00:01:08.460 because you might assume 20 00:01:08.460 --> 00:01:12.060 that these are values that are susceptible to change, 21 00:01:12.060 --> 00:01:14.760 especially here, the mass, right? 22 00:01:14.760 --> 00:01:17.310 However, I still decided to use const 23 00:01:17.310 --> 00:01:18.870 because I already know 24 00:01:18.870 --> 00:01:21.330 that I'm not gonna change these values here 25 00:01:21.330 --> 00:01:23.100 throughout the program. 26 00:01:23.100 --> 00:01:25.050 And so just as we learned before, 27 00:01:25.050 --> 00:01:28.320 I prefer to always use const by default, 28 00:01:28.320 --> 00:01:33.180 and I advise you to actually do the same, okay? 29 00:01:33.180 --> 00:01:37.320 Anyway, let's now calculate the actual BMIs. 30 00:01:37.320 --> 00:01:39.700 So const BMIMark 31 00:01:42.030 --> 00:01:46.677 equals massMark divided... 32 00:01:48.870 --> 00:01:51.180 And let's check out the formula again, 33 00:01:51.180 --> 00:01:54.030 divided by the height squared. 34 00:01:54.030 --> 00:01:58.780 So that's gonna be heightMark squared. 35 00:02:02.310 --> 00:02:06.003 And then the BMI John, 36 00:02:07.530 --> 00:02:09.960 so that's massJohn, 37 00:02:09.960 --> 00:02:13.380 and this time, let's actually use the other formula. 38 00:02:13.380 --> 00:02:15.063 So this one here. 39 00:02:16.380 --> 00:02:17.470 So we're gonna use 40 00:02:19.590 --> 00:02:24.590 heightJohn times heightJohn again. 41 00:02:25.140 --> 00:02:30.003 Okay, and now let's log both of them to the console here. 42 00:02:30.900 --> 00:02:35.850 So BMIMark and BMI John. 43 00:02:40.230 --> 00:02:42.540 And now we have an error here. 44 00:02:42.540 --> 00:02:45.183 Oh, of course, I missed the .log. 45 00:02:46.650 --> 00:02:49.290 Okay, try it again. 46 00:02:49.290 --> 00:02:51.420 And here we go. 47 00:02:51.420 --> 00:02:56.420 So we see that BMIMark is higher than John's BMI. 48 00:02:56.670 --> 00:03:01.260 Okay, so I hope you got the same numbers here than I did. 49 00:03:01.260 --> 00:03:05.040 And if not, I guess you should probably check your code, 50 00:03:05.040 --> 00:03:07.320 unless I have some mistake here. 51 00:03:07.320 --> 00:03:08.823 Let me check that actually. 52 00:03:09.900 --> 00:03:11.823 But I think everything is good. 53 00:03:12.660 --> 00:03:14.490 Okay, so if something is wrong, 54 00:03:14.490 --> 00:03:17.550 then please just let me know, all right? 55 00:03:17.550 --> 00:03:20.250 Now, if you implemented this in a different way, 56 00:03:20.250 --> 00:03:24.150 for example, you might not have created these 57 00:03:24.150 --> 00:03:25.920 separate variables here. 58 00:03:25.920 --> 00:03:28.800 then that's not a problem at all, okay? 59 00:03:28.800 --> 00:03:30.660 You could have logged these calculations 60 00:03:30.660 --> 00:03:33.870 straight to the console, no problem at all. 61 00:03:33.870 --> 00:03:36.870 Again, what matters here is that you make this work 62 00:03:36.870 --> 00:03:40.143 and that in the end, you get these same results here. 63 00:03:41.940 --> 00:03:45.810 Anyway, let's now also do step three 64 00:03:45.810 --> 00:03:49.620 and create a variable called markHigherBMI. 65 00:03:49.620 --> 00:03:51.243 So let's just grab this here, 66 00:03:53.790 --> 00:03:54.963 and const. 67 00:03:56.280 --> 00:03:58.110 And so what we're trying to figure out 68 00:03:58.110 --> 00:04:02.370 is if the BMI of Mark 69 00:04:02.370 --> 00:04:07.370 is higher than the BMI of John, right? 70 00:04:08.520 --> 00:04:11.790 And so that's what comparison operators are for 71 00:04:11.790 --> 00:04:14.730 because remember, that this one here 72 00:04:14.730 --> 00:04:17.880 will return either true or false. 73 00:04:17.880 --> 00:04:22.880 In our example, if BMIMark is larger than one of John, 74 00:04:23.640 --> 00:04:28.470 then the result of this whole operator here will be true 75 00:04:28.470 --> 00:04:31.440 and otherwise, it's gonna be false, okay? 76 00:04:31.440 --> 00:04:34.240 So that's exactly what we did before in this example 77 00:04:36.064 --> 00:04:39.480 with the ages, if I remember correctly. 78 00:04:39.480 --> 00:04:41.403 So where's that? 79 00:04:42.450 --> 00:04:44.310 Ah, yeah, it's right here. 80 00:04:44.310 --> 00:04:48.003 In this case it was the isFullAge variable, right? 81 00:04:49.590 --> 00:04:50.790 Okay. 82 00:04:50.790 --> 00:04:54.093 Anyway, let's log it here to the console as well. 83 00:04:55.440 --> 00:04:59.550 And so we expect this one to be true, right? 84 00:04:59.550 --> 00:05:04.410 Because Mark's BMI is 27 and John's is 24. 85 00:05:04.410 --> 00:05:07.110 And so Mark's is larger, 86 00:05:07.110 --> 00:05:09.960 and so the result of this should be true. 87 00:05:09.960 --> 00:05:11.163 So let's check that. 88 00:05:12.210 --> 00:05:14.313 And indeed, we get true. 89 00:05:15.180 --> 00:05:19.020 Nice. So we basically solved it. 90 00:05:19.020 --> 00:05:22.410 Now I just want to do the same here for test data too. 91 00:05:22.410 --> 00:05:23.733 So I'll just copy this. 92 00:05:24.690 --> 00:05:29.690 So copy and then I will simply comment out these first ones. 93 00:05:32.400 --> 00:05:36.683 So now I'm replacing these with 95, 1.88. 94 00:05:39.630 --> 00:05:44.383 And then here for John, we have 85 and 1.76. 95 00:05:46.290 --> 00:05:48.720 And the rest of course is the same. 96 00:05:48.720 --> 00:05:51.150 And that's the beauty of using variables 97 00:05:51.150 --> 00:05:52.710 because now all we have to do 98 00:05:52.710 --> 00:05:55.590 is to change these values in one place 99 00:05:55.590 --> 00:05:57.870 and then the changes will be propagated 100 00:05:57.870 --> 00:06:00.510 to the rest of the code here. 101 00:06:00.510 --> 00:06:03.213 which references these variables. 102 00:06:05.130 --> 00:06:07.560 Cool. So let's reload. 103 00:06:07.560 --> 00:06:12.560 And now BMI of John is 27, 104 00:06:13.290 --> 00:06:17.310 so it's larger than 26.8. 105 00:06:17.310 --> 00:06:19.200 It's actually very close 106 00:06:19.200 --> 00:06:24.200 but still, BMIMark is now lower than BMIJohn. 107 00:06:24.690 --> 00:06:27.360 So here we, ask the question basically, 108 00:06:27.360 --> 00:06:31.020 is BMIMark larger than BMIJohn? 109 00:06:31.020 --> 00:06:32.730 And in this case, it's not, 110 00:06:32.730 --> 00:06:33.990 so it's false. 111 00:06:33.990 --> 00:06:37.470 And so that's exactly the result that we get here. 112 00:06:37.470 --> 00:06:38.400 All right. 113 00:06:38.400 --> 00:06:43.020 So this one is solved and I hope you solved it as well. 114 00:06:43.020 --> 00:06:45.120 Again, it does not matter at all 115 00:06:45.120 --> 00:06:47.250 if you did it in a different way, 116 00:06:47.250 --> 00:06:49.650 as long as the results were the same. 117 00:06:49.650 --> 00:06:54.120 So basically, as long as you actually made it work. 118 00:06:54.120 --> 00:06:57.150 So hopefully that was a lot of fun 119 00:06:57.150 --> 00:06:59.850 and you could practice your skills a little bit, 120 00:06:59.850 --> 00:07:01.980 which is really something essential 121 00:07:01.980 --> 00:07:04.500 to learn programming properly. 122 00:07:04.500 --> 00:07:07.530 Without repetition and reinforcing your knowledge, 123 00:07:07.530 --> 00:07:11.130 it's impossible really to learn how to coach. 124 00:07:11.130 --> 00:07:13.500 Anyway, see you now in the next video 125 00:07:13.500 --> 00:07:15.990 where we're gonna continue learning the fundamentals 126 00:07:15.990 --> 00:07:18.423 of the beautiful JavaScript language.