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These are the user uploaded subtitles that are being translated: 1 1 00:00:01,310 --> 00:00:04,780 Welcome back to the first coding challenge 2 2 00:00:04,780 --> 00:00:06,573 of the arrays section. 3 3 00:00:08,410 --> 00:00:13,380 And in this one, Julia and Kate are doing a study on dogs. 4 4 00:00:13,380 --> 00:00:17,960 So each of them asked five dog owners about their dog's age 5 5 00:00:17,960 --> 00:00:21,830 and then they stored that data into an array. 6 6 00:00:21,830 --> 00:00:25,070 And that's one array for each of them. 7 7 00:00:25,070 --> 00:00:26,420 All right? 8 8 00:00:26,420 --> 00:00:29,370 And in this study, they are interested in knowing 9 9 00:00:29,370 --> 00:00:33,620 whether each of the dogs is an adult or a puppy. 10 10 00:00:33,620 --> 00:00:36,610 And the rule is that a dog is an adult 11 11 00:00:36,610 --> 00:00:39,430 if it is at least three years old, 12 12 00:00:39,430 --> 00:00:43,123 and it's a puppy if it's less than three years old. 13 13 00:00:44,060 --> 00:00:46,280 And by the way, the test data here, 14 14 00:00:46,280 --> 00:00:50,000 so the arrays for it is down here. 15 15 00:00:50,000 --> 00:00:52,700 So test data one and two. 16 16 00:00:52,700 --> 00:00:54,100 All right? 17 17 00:00:54,100 --> 00:00:58,570 So, your task is to create a function called check dogs, 18 18 00:00:58,570 --> 00:01:00,900 which accepts these two arrays 19 19 00:01:00,900 --> 00:01:02,573 and does the following things. 20 20 00:01:03,930 --> 00:01:08,530 So first, Julia found out that the owners of the first 21 21 00:01:08,530 --> 00:01:13,530 and the last two dogs do actually have cats and not dogs. 22 22 00:01:13,650 --> 00:01:15,430 So here, what I want you to do 23 23 00:01:15,430 --> 00:01:18,910 is to create a shallow copy of Julia's array 24 24 00:01:18,910 --> 00:01:23,040 and then remove the cat ages from the copied array. 25 25 00:01:23,040 --> 00:01:26,040 And you should copy it because it's a bad practice 26 26 00:01:26,040 --> 00:01:29,653 to mutate the parameters or the arguments of a function. 27 27 00:01:30,750 --> 00:01:32,580 Then second, create an array 28 28 00:01:32,580 --> 00:01:35,950 with both Julia's and Kate's data. 29 29 00:01:35,950 --> 00:01:39,280 So for Julia, of course, the corrected data. 30 30 00:01:39,280 --> 00:01:40,940 And then for each of the dogs, 31 31 00:01:40,940 --> 00:01:44,700 simply log to the console whether it is an adult 32 32 00:01:44,700 --> 00:01:46,780 with a string like this 33 33 00:01:46,780 --> 00:01:50,160 or a puppy and then with a string like this. 34 34 00:01:50,160 --> 00:01:52,008 And that's, of course, according to the rules 35 35 00:01:52,008 --> 00:01:53,830 in the beginning. 36 36 00:01:53,830 --> 00:01:57,920 And then, just run this function for both test data sets. 37 37 00:01:57,920 --> 00:01:59,430 And that's it. 38 38 00:01:59,430 --> 00:02:01,980 So all you need to do is to use the tools 39 39 00:02:01,980 --> 00:02:04,990 from all the lectures in this section so far 40 40 00:02:04,990 --> 00:02:08,830 and then I think you will be fine solving this on your own. 41 41 00:02:08,830 --> 00:02:11,260 So this is really all about using the tools 42 42 00:02:11,260 --> 00:02:13,270 that we already learned before 43 43 00:02:13,270 --> 00:02:16,743 and there's not a lot of new thinking to do here. 44 44 00:02:17,600 --> 00:02:19,650 So I hope you manage to do this one. 45 45 00:02:19,650 --> 00:02:21,703 And I see you back here in a second. 46 46 00:02:25,520 --> 00:02:26,353 All right. 47 47 00:02:28,860 --> 00:02:32,880 So hopefully, you did this just fine without any problems 48 48 00:02:34,880 --> 00:02:39,120 but I will anyway write my solution here 49 49 00:02:39,120 --> 00:02:41,760 and explain what I am doing. 50 50 00:02:41,760 --> 00:02:45,510 So, we accept the dogs from Julia 51 51 00:02:45,510 --> 00:02:48,143 and the dogs from Kate. 52 52 00:02:51,550 --> 00:02:55,240 And we will call this with the test data. 53 53 00:02:55,240 --> 00:02:57,570 And so, Julia's data is this 54 54 00:02:57,570 --> 00:03:01,530 and there's not a need to store them in separate variables. 55 55 00:03:01,530 --> 00:03:03,603 I will just call the function like this. 56 56 00:03:07,770 --> 00:03:08,930 All right? 57 57 00:03:08,930 --> 00:03:12,963 And now we should create a shallow copy of dogs Julia, 58 58 00:03:14,720 --> 00:03:17,623 so that we can then remove some elements from there. 59 59 00:03:18,840 --> 00:03:21,323 So dogsJuliaCorrected.slice 60 60 00:03:23,816 --> 00:03:27,150 So dogsJuliaCorrected.slice 61 61 00:03:28,090 --> 00:03:30,660 and so I'm using here the method 62 62 00:03:30,660 --> 00:03:33,290 and not the spread operator. 63 63 00:03:33,290 --> 00:03:36,880 And now, I will simply remove some elements from there. 64 64 00:03:36,880 --> 00:03:41,440 So dogsJuliaCorrected.splice 65 65 00:03:43,030 --> 00:03:47,110 and so, it tells us that the first 66 66 00:03:47,110 --> 00:03:51,773 and the last two dogs are not valid basically. 67 67 00:03:52,700 --> 00:03:57,140 So, the first is element number zero 68 68 00:03:57,140 --> 00:03:59,343 and then we want to remove one. 69 69 00:04:00,760 --> 00:04:02,093 So that's the first part. 70 70 00:04:02,980 --> 00:04:07,900 And then dogsJuliaCorrected.splice 71 71 00:04:08,900 --> 00:04:11,333 and then the last two, which is minus two. 72 72 00:04:12,200 --> 00:04:13,033 Okay? 73 73 00:04:13,970 --> 00:04:17,268 So, let's take a look here simply at 74 74 00:04:17,268 --> 00:04:22,040 dogsJuliaCorrected just to see 75 75 00:04:22,040 --> 00:04:24,193 if this is correct actually. 76 76 00:04:25,470 --> 00:04:27,670 So we need the console now. 77 77 00:04:27,670 --> 00:04:32,020 And so this was or beginning data and indeed, 78 78 00:04:32,020 --> 00:04:35,930 the first and the last two are done here. 79 79 00:04:35,930 --> 00:04:37,260 All right? 80 80 00:04:37,260 --> 00:04:39,760 Now, of course, you could have also done this 81 81 00:04:39,760 --> 00:04:41,250 in a different way, 82 82 00:04:41,250 --> 00:04:43,830 which is to simply copy the correct data 83 83 00:04:43,830 --> 00:04:46,653 from the original using the slice method. 84 84 00:04:48,180 --> 00:04:51,317 So something like this: dogsJulia.slice, 85 85 00:04:52,838 --> 00:04:55,960 So something like this: dogsJulia.slice, 86 86 00:04:55,960 --> 00:04:58,450 so starting from the second one 87 87 00:04:58,450 --> 00:05:00,623 and then all the way to the third one. 88 88 00:05:02,710 --> 00:05:06,270 Okay, and so this would give us the exact same result 89 89 00:05:06,270 --> 00:05:10,630 but in this case, I just wanted to use the splice method. 90 90 00:05:10,630 --> 00:05:14,850 And, in fact, I wanted you to use the splice method as well 91 91 00:05:14,850 --> 00:05:17,763 and that's why I gave you that task like that. 92 92 00:05:19,140 --> 00:05:22,270 Anyway, we don't need this here anymore. 93 93 00:05:22,270 --> 00:05:26,663 Let's now simply create a new variable with both these dogs. 94 94 00:05:27,600 --> 00:05:29,510 So simply calling it dogs. 95 95 00:05:29,510 --> 00:05:32,000 And again, we could use the spread operator here 96 96 00:05:32,000 --> 00:05:34,180 which I actually prefer 97 97 00:05:34,180 --> 00:05:37,010 but since we are in the arrays section here, 98 98 00:05:37,010 --> 00:05:39,283 let's do everything with array methods. 99 99 00:05:41,110 --> 00:05:44,080 So that's the concat method, remember? 100 100 00:05:44,080 --> 00:05:45,440 And then we want to join 101 101 00:05:46,350 --> 00:05:50,023 the corrected Julia dogs with dogs Kate. 102 102 00:05:54,380 --> 00:05:56,473 So always a good idea to check. 103 103 00:05:57,340 --> 00:05:59,933 And yeah, that's correct. 104 104 00:06:02,170 --> 00:06:03,120 All right? 105 105 00:06:03,120 --> 00:06:05,810 And so, all we have to do now is 106 106 00:06:06,890 --> 00:06:09,270 basically create this string. 107 107 00:06:09,270 --> 00:06:10,993 Let me just copy this string. 108 108 00:06:12,500 --> 00:06:16,920 And so, looping over this array is now an easy task. 109 109 00:06:16,920 --> 00:06:18,370 Hopefully. 110 110 00:06:18,370 --> 00:06:20,237 So dogs.forEach 111 111 00:06:22,420 --> 00:06:24,250 then the callback function 112 112 00:06:24,250 --> 00:06:25,410 and one more time, 113 113 00:06:25,410 --> 00:06:29,993 we need actually the current element and also the index. 114 114 00:06:31,240 --> 00:06:34,760 And that's because here is the number. 115 115 00:06:34,760 --> 00:06:38,763 So dog number one and it's going to go all the way to seven. 116 116 00:06:40,070 --> 00:06:42,483 And so, let's check out our rule. 117 117 00:06:43,340 --> 00:06:47,893 So, a dog is an adult if he is at least three years old. 118 118 00:06:51,290 --> 00:06:56,203 So if dog is greater equal three, 119 119 00:06:57,720 --> 00:07:02,483 then log a string like this. 120 120 00:07:08,890 --> 00:07:11,313 So here is the index plus one. 121 121 00:07:15,505 --> 00:07:19,960 Here goes the dog itself 122 122 00:07:19,960 --> 00:07:21,040 and then else 123 123 00:07:24,260 --> 00:07:25,403 is still a puppy. 124 124 00:07:30,470 --> 00:07:32,573 And here we need just this. 125 125 00:07:34,110 --> 00:07:36,673 And, I think, with this we are good. 126 126 00:07:37,720 --> 00:07:38,793 Just remove this. 127 127 00:07:40,510 --> 00:07:45,030 And yes, dog number one is five years old, 128 128 00:07:45,030 --> 00:07:47,050 so it's still an adult. 129 129 00:07:47,050 --> 00:07:51,200 Number two is two years old, so still a puppy. 130 130 00:07:51,200 --> 00:07:53,480 This is again a puppy with one year old 131 131 00:07:55,140 --> 00:07:59,450 and so, yeah, that's the correct solution. 132 132 00:07:59,450 --> 00:08:02,423 Now let's just do it for this test data here. 133 133 00:08:05,295 --> 00:08:07,653 Gonna duplicate this one. 134 134 00:08:14,380 --> 00:08:16,180 Let's just comment out the first one 135 135 00:08:18,270 --> 00:08:21,280 and okay, here we only have one puppy 136 136 00:08:21,280 --> 00:08:24,110 which is the one before the last. 137 137 00:08:24,110 --> 00:08:26,640 And so this one is correct as well. 138 138 00:08:26,640 --> 00:08:28,933 And so, challenge completed. 11544