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These are the user uploaded subtitles that are being translated: 1 00:00:00,090 --> 00:00:01,380 What is going on, guys? 2 00:00:01,380 --> 00:00:08,130 And welcome back to another section where we are going to talk about a new topic called ERASE. 3 00:00:08,790 --> 00:00:11,670 So what is in array in this video? 4 00:00:11,750 --> 00:00:18,690 We are going to talk about erase and explain why it is an array, why you should consider using it and 5 00:00:18,690 --> 00:00:19,310 so on. 6 00:00:19,620 --> 00:00:24,920 So up until now, you've seen how single variables were created and used. 7 00:00:25,170 --> 00:00:31,560 And by seeing single variables say simply mean that you've been using, for example, one variable of 8 00:00:31,560 --> 00:00:32,530 some type rate. 9 00:00:32,880 --> 00:00:39,950 For example, you could have created a variable with the name age and then assign it with some value. 10 00:00:39,960 --> 00:00:41,280 For example, fifteen. 11 00:00:41,430 --> 00:00:48,570 Or you could have created two other variables, let's say grade one and grade two to hold your grades 12 00:00:48,570 --> 00:00:51,570 and then use them to calculate the average grade. 13 00:00:52,350 --> 00:00:58,050 So we've created a couple of separated boxes or variables, as we also call them. 14 00:00:58,050 --> 00:00:58,380 Right. 15 00:00:58,800 --> 00:01:04,050 With different names to hold different types of data and different data. 16 00:01:04,200 --> 00:01:05,260 And that was awesome. 17 00:01:05,280 --> 00:01:08,130 But we want to go one step further. 18 00:01:08,220 --> 00:01:14,670 We want to learn a new principle which is frequently being used in programming, and that is the array. 19 00:01:14,940 --> 00:01:20,640 But before we do so, I want you to think of a time when you had to write a program to calculate your 20 00:01:20,640 --> 00:01:21,480 average grade. 21 00:01:21,900 --> 00:01:26,640 So we've simply created, let's say, two variables, grade one and grade two. 22 00:01:26,970 --> 00:01:31,100 And we've used that to calculate the average of these two grades. 23 00:01:31,140 --> 00:01:31,430 Okay. 24 00:01:31,770 --> 00:01:38,580 But that was some basic scenario when we only had two grades and thus we had only two variables, grade 25 00:01:38,580 --> 00:01:42,000 one and grade two, which were used to hold the data. 26 00:01:42,450 --> 00:01:48,570 So in this case, the program knows only to calculate the average between these two grades. 27 00:01:48,960 --> 00:01:54,480 And if we would like to upgrade upgrading somewhat our program, maybe just a little bit. 28 00:01:54,870 --> 00:02:00,030 So it will be able to, let's say, calculate the average of three grades van. 29 00:02:00,030 --> 00:02:04,860 In this case, we should simply add a third variable and maybe call it great. 30 00:02:04,950 --> 00:02:05,520 Three. 31 00:02:05,600 --> 00:02:05,970 Right. 32 00:02:06,180 --> 00:02:10,950 And then we can just calculate rate, for example, after we added the third grade. 33 00:02:11,250 --> 00:02:17,850 Then we can just calculate the average between these three variables of these three values. 34 00:02:18,000 --> 00:02:22,350 Just by summing up all of them and dividing by three. 35 00:02:22,800 --> 00:02:23,460 All right. 36 00:02:23,850 --> 00:02:30,570 Now, what will happen if you have 10 or 20 grades that your program needs to store, not only to calculate 37 00:02:30,570 --> 00:02:35,910 the average, but also to store for later processing of these data or something like that? 38 00:02:36,390 --> 00:02:41,900 Will you create 20 different grade variables and call them by names? 39 00:02:41,910 --> 00:02:42,480 I don't know. 40 00:02:42,500 --> 00:02:45,630 Grade one, grade two, grade three and so on. 41 00:02:45,870 --> 00:02:47,610 That's kind of absurd, isn't it? 42 00:02:47,850 --> 00:02:54,930 Your program is going simply to be huge and your code is going to be very hard to maintain. 43 00:02:55,410 --> 00:03:01,710 Not to mention the fact that you may have a lot of bugs because you have missed one or two grades in 44 00:03:01,710 --> 00:03:03,210 your calculations. 45 00:03:03,300 --> 00:03:09,600 So would you like to have a program with hundreds of different variables that just will present your 46 00:03:09,600 --> 00:03:10,140 grades? 47 00:03:10,590 --> 00:03:11,520 I bet you don't. 48 00:03:12,120 --> 00:03:16,530 You would rather have some one collection with all the grades inside of it. 49 00:03:16,710 --> 00:03:20,040 One collection that can be referred to with just one name. 50 00:03:20,070 --> 00:03:25,410 That could be access to get the details regarding each of your grades. 51 00:03:25,560 --> 00:03:28,680 It's just like putting all your grades in one bag. 52 00:03:28,980 --> 00:03:35,790 And instead of spreading these grades randomly in the bag, let's say that we would like to use a special 53 00:03:35,790 --> 00:03:36,750 type of bag. 54 00:03:36,900 --> 00:03:44,370 Some unique bag in which all the grades are going to be arranged in just one straight line. 55 00:03:44,670 --> 00:03:51,360 Now, when all the elements are well organized, we can access any of the grades we have just by using 56 00:03:51,450 --> 00:03:54,180 or referring to this bag. 57 00:03:54,330 --> 00:04:00,510 And let's also say that's the name of the bag will be grades, just like you can see right now on the 58 00:04:00,510 --> 00:04:00,960 screen. 59 00:04:01,380 --> 00:04:09,150 So we know that grades the bag we've defined may contain one, two, five or any other number of elements 60 00:04:09,180 --> 00:04:12,330 or better say any number of grades. 61 00:04:12,510 --> 00:04:16,710 And basically, we need we can access, read and write. 62 00:04:17,200 --> 00:04:21,200 Are any element within these grades array. 63 00:04:21,510 --> 00:04:25,200 So we can take any any grade in this bag. 64 00:04:25,320 --> 00:04:29,070 And simply to see what value it holds. 65 00:04:29,130 --> 00:04:34,590 So we can say that each element in the bag will simply hold a grade. 66 00:04:34,680 --> 00:04:37,200 And how should you access any of these elements? 67 00:04:37,290 --> 00:04:40,140 Well, we will see in the next video. 68 00:04:41,820 --> 00:04:48,630 In one of the next videos here, how it can be accessed, because any of the elements here in the bag 69 00:04:48,630 --> 00:04:57,660 has its own unique index, its own unique specifiers within this well organized bag, well organized 70 00:04:58,060 --> 00:04:58,720 collection. 71 00:04:58,980 --> 00:04:59,800 And just basic. 72 00:04:59,910 --> 00:05:07,530 Jesse Frank, the index in the bag, we will be able to access a particular element and then you can 73 00:05:07,530 --> 00:05:09,460 simply read into it. 74 00:05:09,480 --> 00:05:10,290 Read for me. 75 00:05:10,440 --> 00:05:12,540 Change it or do whatever you like. 76 00:05:12,660 --> 00:05:15,990 So that's also one thing we're going to talk in the next videos. 77 00:05:16,440 --> 00:05:18,930 And basically, to sum everything up. 78 00:05:19,290 --> 00:05:24,600 We first create some unique bag than we can put inside of this unique bag. 79 00:05:24,600 --> 00:05:31,710 Some elements, for example, grades and the elements we put inside this bag are not just scattered 80 00:05:31,710 --> 00:05:39,630 around the area, arranging a street door there where there is a specified specified place, a specified 81 00:05:39,690 --> 00:05:43,590 index for each of the elements in the bag in disarray. 82 00:05:44,250 --> 00:05:48,580 And of course, this unique bag has some size. 83 00:05:48,700 --> 00:05:48,890 Right. 84 00:05:48,900 --> 00:05:52,710 It may has a different type of size each. 85 00:05:52,980 --> 00:05:59,970 There are a lot of different bags out there, which is simply the number of aliments the bag can hold. 86 00:06:00,330 --> 00:06:06,450 So the more elements are given, a given bag can hold, the bigger the bag itself would be. 87 00:06:06,870 --> 00:06:07,200 Right. 88 00:06:07,210 --> 00:06:07,800 You agree? 89 00:06:08,820 --> 00:06:11,490 So we can create an array. 90 00:06:11,670 --> 00:06:14,460 We can put inside the array some elements. 91 00:06:14,460 --> 00:06:19,050 And there are some elements in a well organized manner spread around inside. 92 00:06:19,500 --> 00:06:24,030 And also, we know that there may be different types of bags. 93 00:06:24,930 --> 00:06:33,150 So that's just my analogy to how I see a raise and how I suggest you to look at them basically just 94 00:06:33,150 --> 00:06:35,190 some bag to hold elements. 95 00:06:35,220 --> 00:06:38,970 And you can access any of the elements just by using the index. 96 00:06:39,450 --> 00:06:47,010 You can specify what is the type of the elements that are going to be inside of this collection, inside 97 00:06:47,010 --> 00:06:47,710 of this array. 98 00:06:48,030 --> 00:06:50,760 And also the size of the array may change. 99 00:06:50,790 --> 00:06:54,570 So there are a lot of different bags out there. 100 00:06:55,080 --> 00:07:03,240 And I promise you guys in the next couple of videos where we are going to talk about how it is used 101 00:07:03,240 --> 00:07:09,240 in our programming language, things will become more clear to you and you will understand all these 102 00:07:09,240 --> 00:07:11,040 concepts, all of this analogy. 103 00:07:11,370 --> 00:07:18,150 So just for now, stay focused and let's move on to the last example that I want to talk about in this 104 00:07:18,150 --> 00:07:18,600 video. 105 00:07:18,750 --> 00:07:22,500 So let's see the array concept once again. 106 00:07:22,830 --> 00:07:26,190 So there is an array here is on our array. 107 00:07:26,220 --> 00:07:30,210 Yeah, we can see the bag on the right and in the middle. 108 00:07:30,300 --> 00:07:36,570 Right now, we can see all the content, all the elements within this array, within this bag. 109 00:07:37,110 --> 00:07:43,410 So this array has a specified size which says how many elements on this array may have. 110 00:07:43,410 --> 00:07:46,080 And in this case, we have nine elements. 111 00:07:46,530 --> 00:07:54,870 So the elements within the array are organized in such a way that this order of the elements matters. 112 00:07:54,990 --> 00:07:59,430 And basically you can access any of the elements, just like we can see right now. 113 00:07:59,820 --> 00:08:04,230 And you can change it just by using the index of the element. 114 00:08:04,650 --> 00:08:11,040 So I really hope that this animated introduction of the arrays concept is clear for you. 115 00:08:11,200 --> 00:08:18,000 And in the next video, we are going to take a look at how we can use arrays in our programming language. 116 00:08:18,600 --> 00:08:21,660 So, as always, guys, thank you so much for watching. 117 00:08:21,750 --> 00:08:23,980 And I'll see you in the next video. 11354

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