1 00:00:00,790 --> 00:00:01,940 Welcome back. 2 00:00:01,960 --> 00:00:04,840 Let me show you how I'm going to solve this challenge. 3 00:00:05,020 --> 00:00:08,560 Well, this challenge is indeed a challenge. 4 00:00:08,800 --> 00:00:15,190 We need to think and use most of the arithmetic that we have talked about. 5 00:00:15,400 --> 00:00:20,110 So it says that create a function to remove all duplicate values. 6 00:00:20,530 --> 00:00:21,550 Oh, my God. 7 00:00:21,580 --> 00:00:22,780 How is it possible? 8 00:00:22,810 --> 00:00:24,070 Okay, so let's. 9 00:00:24,070 --> 00:00:26,620 Let's go step by step. 10 00:00:26,710 --> 00:00:30,310 So first, let's see, we have our arrays of duplicate value. 11 00:00:30,340 --> 00:00:30,930 Let's say this. 12 00:00:30,940 --> 00:00:41,500 My array cost array data here is equal to let's say I have this, let's say two, four, 624, four, 13 00:00:41,500 --> 00:00:43,510 five, eight, nine. 14 00:00:43,510 --> 00:00:46,030 See that we have some duplicate values. 15 00:00:46,300 --> 00:00:49,270 For example, we have four here, four here, four here. 16 00:00:49,270 --> 00:00:51,310 Four and two has appeared 2 to 2. 17 00:00:51,340 --> 00:00:53,650 I want to remove those values. 18 00:00:53,650 --> 00:00:55,940 So now this is my sample data. 19 00:00:55,960 --> 00:00:58,090 So here comes the function. 20 00:00:58,510 --> 00:01:00,100 So function. 21 00:01:02,510 --> 00:01:04,940 Remove duplicates. 22 00:01:06,670 --> 00:01:07,450 Then. 23 00:01:08,800 --> 00:01:11,530 My parentheses and then my carry braces. 24 00:01:11,530 --> 00:01:14,350 This function should take in the array. 25 00:01:14,440 --> 00:01:16,720 I want to remove this, which is this one. 26 00:01:17,260 --> 00:01:18,730 So now here comes. 27 00:01:20,440 --> 00:01:24,910 Next is we need to remove the value switch here. 28 00:01:24,940 --> 00:01:28,020 Remove duplicates. 29 00:01:29,390 --> 00:01:29,920 Good. 30 00:01:29,930 --> 00:01:33,200 So cost, let's say, duplicate. 31 00:01:34,200 --> 00:01:34,890 By that. 32 00:01:35,830 --> 00:01:37,180 Duplicates removed. 33 00:01:38,550 --> 00:01:42,250 Is equal to let me say duplicate whatever. 34 00:01:42,270 --> 00:01:46,500 I think sometimes the naming convention is equal to. 35 00:01:47,460 --> 00:01:47,780 Now. 36 00:01:47,790 --> 00:01:49,860 Here comes first. 37 00:01:50,250 --> 00:01:54,150 I need to take the highway or pass in my area. 38 00:01:54,180 --> 00:01:54,820 Dot. 39 00:01:55,380 --> 00:02:03,300 I want to filter out that so dot filter because it says that create a new array with all the duplicates 40 00:02:03,300 --> 00:02:04,110 removed. 41 00:02:04,560 --> 00:02:10,860 So here I'm going to be the let me say a filtered, filtered the more precise filtered data. 42 00:02:11,430 --> 00:02:12,120 Yes. 43 00:02:12,270 --> 00:02:14,220 So here on the array. 44 00:02:14,220 --> 00:02:17,920 On the array, I have filter how to few automated sorry. 45 00:02:17,940 --> 00:02:22,920 And then for the filter, I'm going to pass in the callback function. 46 00:02:23,250 --> 00:02:26,970 And remember as that and then my parenthesis. 47 00:02:27,330 --> 00:02:27,900 Good. 48 00:02:27,900 --> 00:02:33,480 So inside my callback function before I can filter out. 49 00:02:33,510 --> 00:02:34,650 Let's see the logic. 50 00:02:35,880 --> 00:02:42,900 Well, I need to get the entire array itself in my filter out. 51 00:02:43,260 --> 00:02:43,980 Okay. 52 00:02:44,070 --> 00:02:55,320 And after that, I'm going to use the index off to check the element which is equal to the index of 53 00:02:55,320 --> 00:02:56,790 the individual record. 54 00:02:56,790 --> 00:02:59,760 Then it means that it has been faded out. 55 00:03:00,180 --> 00:03:02,340 So here, inside a callback. 56 00:03:02,340 --> 00:03:07,140 As for the reduce, we can have access to the element itself. 57 00:03:07,200 --> 00:03:08,890 Meaning the actual record here. 58 00:03:08,910 --> 00:03:09,600 Data here. 59 00:03:10,400 --> 00:03:11,990 And this is the index. 60 00:03:12,000 --> 00:03:13,580 Index for the index. 61 00:03:13,580 --> 00:03:15,170 Meaning at which point. 62 00:03:16,160 --> 00:03:19,210 Can we find that particular record in the array? 63 00:03:19,220 --> 00:03:20,560 That's an index. 64 00:03:20,570 --> 00:03:24,770 And then I have the original array that has been passed in. 65 00:03:25,190 --> 00:03:26,730 So to try out here. 66 00:03:26,750 --> 00:03:28,850 Let's console.log all these. 67 00:03:30,250 --> 00:03:35,470 So first one let me console.log the l the elements as that. 68 00:03:35,470 --> 00:03:40,150 So let me copy this one three times and show you. 69 00:03:41,570 --> 00:03:42,440 These ones. 70 00:03:42,440 --> 00:03:49,550 So we always say ID X for index when I bring the original array as my original array. 71 00:03:49,760 --> 00:03:51,470 So let's save it and let's see. 72 00:03:51,980 --> 00:03:58,990 Well, unless I call it a function, so come down here called remove duplicates, remove duplicate, 73 00:03:59,000 --> 00:04:05,810 then I'll pass in the array data because I want to call it and see and pass in this data to have this 74 00:04:05,810 --> 00:04:07,210 logic to operate on. 75 00:04:07,220 --> 00:04:07,640 Okay. 76 00:04:07,820 --> 00:04:10,550 So if I save it now, let's have a look. 77 00:04:11,120 --> 00:04:15,620 You can see that for the first one we have the element, which is two. 78 00:04:16,510 --> 00:04:17,800 That is the first one. 79 00:04:18,490 --> 00:04:24,490 The elements and the index is at what point does this work occurs at index zero. 80 00:04:24,490 --> 00:04:26,920 So here we have two and zero. 81 00:04:27,310 --> 00:04:29,740 That's why we have the index or which zero. 82 00:04:29,980 --> 00:04:37,240 And this array is an original array from two forces, two, four, four, five, eight, nine four which 83 00:04:37,240 --> 00:04:41,230 is this two forces 222445894. 84 00:04:41,260 --> 00:04:41,980 That is it. 85 00:04:41,980 --> 00:04:46,720 So now that we've got that one, next is now let's remove this one. 86 00:04:47,620 --> 00:04:48,190 Good. 87 00:04:48,400 --> 00:04:53,830 So we want to also go ahead and filter again this one. 88 00:04:54,830 --> 00:04:56,060 Soft vitrine. 89 00:04:56,210 --> 00:05:06,860 So here we going to use the let's return from here return here and then on the array dot index of remember 90 00:05:06,860 --> 00:05:08,630 the index of how we do it. 91 00:05:09,380 --> 00:05:14,960 The index of is used to determine at which position this particular element worked. 92 00:05:14,990 --> 00:05:18,170 If it returns zero, it means it doesn't exist. 93 00:05:18,470 --> 00:05:19,040 Right. 94 00:05:19,040 --> 00:05:25,280 But if it is going to give us some kind of give us, let's say, the index of that particular element 95 00:05:25,280 --> 00:05:26,180 we are searching for. 96 00:05:26,360 --> 00:05:28,580 So an index of. 97 00:05:29,150 --> 00:05:30,020 Of what? 98 00:05:30,440 --> 00:05:31,820 Of the element. 99 00:05:33,050 --> 00:05:40,070 So here, if I return this one, let's see if this one going to retain the actual element or given the 100 00:05:40,070 --> 00:05:42,730 index at which this element occurred. 101 00:05:42,740 --> 00:05:49,670 For the meantime, let's consider the log inside my function, the filtered data here. 102 00:05:51,300 --> 00:05:52,220 Take data here. 103 00:05:52,230 --> 00:05:53,100 So let's see. 104 00:05:54,120 --> 00:05:59,880 Now you see that I got it because all of them has an array that's indexed. 105 00:06:00,240 --> 00:06:05,430 So now I want to go ahead and measure that if in this record here. 106 00:06:06,310 --> 00:06:09,520 If the if it is equal to the index. 107 00:06:10,410 --> 00:06:18,390 So let me console.log the index again for to see here console.log the index, which is the index. 108 00:06:18,390 --> 00:06:19,230 So let's see. 109 00:06:19,800 --> 00:06:21,210 Oh yeah. 110 00:06:21,270 --> 00:06:24,690 It's I know I need to come in here. 111 00:06:24,690 --> 00:06:26,040 It's outside my function. 112 00:06:26,040 --> 00:06:26,910 So here. 113 00:06:27,450 --> 00:06:28,170 Yes. 114 00:06:28,170 --> 00:06:31,320 So the first one is the index and the actual response here. 115 00:06:31,350 --> 00:06:39,480 Now you can see we have zero one, two, three, four. 116 00:06:39,480 --> 00:06:41,310 So if you see that. 117 00:06:42,040 --> 00:06:44,050 Is there a net zero in this one? 118 00:06:44,080 --> 00:06:44,830 No. 119 00:06:45,660 --> 00:06:46,770 What about one? 120 00:06:47,040 --> 00:06:47,790 No. 121 00:06:47,970 --> 00:06:49,080 What about two? 122 00:06:49,260 --> 00:06:49,980 No. 123 00:06:50,130 --> 00:06:51,120 About three? 124 00:06:51,150 --> 00:06:51,840 No. 125 00:06:51,990 --> 00:06:52,950 What about four? 126 00:06:52,980 --> 00:06:53,700 Yes. 127 00:06:54,250 --> 00:06:57,180 So I'm going to filter out to go for a password. 128 00:06:57,390 --> 00:07:00,480 This, this and this and this. 129 00:07:00,870 --> 00:07:02,000 Okay, so this. 130 00:07:02,030 --> 00:07:02,730 I'm going to do. 131 00:07:02,820 --> 00:07:07,950 So inside this retain if it is equal to. 132 00:07:08,130 --> 00:07:08,610 Yeah. 133 00:07:08,670 --> 00:07:11,370 Is equal to the index. 134 00:07:11,810 --> 00:07:13,510 That means that it has been. 135 00:07:13,590 --> 00:07:14,600 It exists. 136 00:07:14,610 --> 00:07:18,940 Then we can filter out those records. 137 00:07:19,080 --> 00:07:22,650 So now if I save this one. 138 00:07:22,650 --> 00:07:23,610 Now let's see. 139 00:07:24,030 --> 00:07:25,200 Let's refresh it. 140 00:07:25,240 --> 00:07:27,580 Now something has happened. 141 00:07:27,600 --> 00:07:28,740 Now this one. 142 00:07:29,020 --> 00:07:30,840 Remove this one from here and let's see. 143 00:07:31,610 --> 00:07:32,900 Now we see that. 144 00:07:33,200 --> 00:07:34,610 Do we have duplicate again? 145 00:07:34,640 --> 00:07:35,750 No, we don't have. 146 00:07:35,960 --> 00:07:39,590 So you have two, four, six, five, eight, nine. 147 00:07:39,600 --> 00:07:45,200 We don't have two, two and four, four in it anymore because here we have filter out that. 148 00:07:45,560 --> 00:07:47,030 So that is it. 149 00:07:47,030 --> 00:07:54,260 So if knowing this way we can come down here and let's say let's say the because and return from this 150 00:07:54,260 --> 00:07:57,680 function, return the filtered data. 151 00:07:58,100 --> 00:07:58,300 Yeah. 152 00:07:58,430 --> 00:08:03,770 So now I can assign cause the results equal to that. 153 00:08:04,280 --> 00:08:05,230 And now. 154 00:08:06,840 --> 00:08:11,790 Let's console.log the response. 155 00:08:11,880 --> 00:08:12,600 Let's see. 156 00:08:13,860 --> 00:08:22,170 And before let's also console.log the original array, which is this one and let's compare now let's 157 00:08:22,170 --> 00:08:25,110 see we see that now this origin array. 158 00:08:26,040 --> 00:08:28,680 Now there is no duplicate. 159 00:08:28,680 --> 00:08:32,159 Again, we have quality here but here have to two here original one. 160 00:08:32,159 --> 00:08:33,840 We have one for fall. 161 00:08:33,840 --> 00:08:38,400 Here we have one that's about the filtering duplicate values. 162 00:08:38,760 --> 00:08:40,110 Then this video. 163 00:08:40,140 --> 00:08:44,760 Let's have our last coding challenge about letters.