WEBVTT 00:01.750 --> 00:07.900 It's time to talk about next very important aspect, I'm going to discuss what a race are in JavaScript. 00:08.410 --> 00:10.720 eRate is a special type of a variable. 00:11.200 --> 00:13.060 It doesn't store just one value. 00:13.450 --> 00:15.100 It stores a list of values. 00:15.700 --> 00:21.550 Eraser especially helpful when you do not know how many items at least will contain, because when you 00:21.550 --> 00:25.900 create the array, you do not need to specify how many values it will hold. 00:27.010 --> 00:34.540 All right, you create an array and give it a name, just like you would do for any other variable using 00:34.540 --> 00:38.110 the word keyword, followed by the name of the array. 00:38.770 --> 00:44.410 The values are assigned to the array inside a pair of square brackets, and each value is separated 00:44.410 --> 00:45.110 by a comma. 00:45.700 --> 00:49.150 Let's write names, for example, John. 00:51.060 --> 00:54.300 Then Bob and Mary. 00:55.570 --> 01:01.150 In this case, we have an array which consists of three values, but you can pass either strings or 01:01.150 --> 01:07.450 numbers or any data type you would like, you're able to create array with different data types simultaneously, 01:07.450 --> 01:11.470 like strings, numbers, boolean values. 01:12.680 --> 01:14.240 Even erase. 01:15.990 --> 01:23.100 And so on, this technique of creating Erra is known as a right literal, it's usually the preferred 01:23.100 --> 01:24.780 method for creating a race. 01:25.510 --> 01:29.470 As you noticed, we can use a right to store multiple values inside one variable. 01:29.820 --> 01:35.220 This is very convenient and helpful because it allows us to avoid creating multiple variables at the 01:35.220 --> 01:35.790 same time. 01:36.690 --> 01:38.280 Let's log it in council. 01:38.640 --> 01:38.940 Right. 01:38.940 --> 01:40.290 Cancel that lock array. 01:43.120 --> 01:51.250 So here we have our right values in an array are accessed as if they are in a number, at least it's 01:51.250 --> 01:56.860 important to note that the numbering of this list starts at zero and not one. 01:57.610 --> 02:02.710 Each item in an array is automatically given a number, and it's called an index. 02:03.850 --> 02:10.450 This can be used to access specific items in the array, so you see that the first item, John, has 02:10.450 --> 02:18.310 an index number zero, the second item has index one and etc. They said we have for the sixth member, 02:18.310 --> 02:25.660 which is itself an array, and it consists of three values and they are numbered in the same way as 02:25.660 --> 02:25.940 well. 02:27.070 --> 02:33.490 You can also see here a length, which is a property of an array, and it shows us the number of items 02:33.490 --> 02:34.300 array includes. 02:35.020 --> 02:42.580 As you see, the main array consists of six items and the second array consists of three values that 02:42.580 --> 02:49.170 is very useful property, and it's frequently used when we deal with arrays below the property. 02:49.180 --> 02:54.670 You can see underscore, underscore, Proteau, underscore, underscore, but you can just ignore it 02:54.670 --> 02:57.010 because we will talk about it in coming sections. 02:58.570 --> 02:59.050 All right. 02:59.590 --> 03:04.770 In order to access on the specific item of all right, we can do it using index. 03:05.470 --> 03:11.050 So if you need to access, for example, on the first item, John, you need to write the name of the 03:11.050 --> 03:14.830 array and in the square brackets, the index number of the item. 03:15.790 --> 03:21.760 As you remember, a number of the items always starts with zero, so John has the index number at zero. 03:22.780 --> 03:23.830 Let's reload. 03:23.830 --> 03:29.160 And you see we have John in the same way you can access all the other items. 03:29.950 --> 03:32.590 Let's change zero to one and see. 03:32.590 --> 03:39.700 We've got the second item in order to get access on items of array, which is placed inside the main 03:39.700 --> 03:40.070 array. 03:40.510 --> 03:43.590 At first we need to have access on the main array itself. 03:44.290 --> 03:44.530 So. 03:44.530 --> 03:44.800 Right. 03:44.800 --> 03:45.880 Index number five. 03:48.260 --> 03:54.140 So we have accessed on it, right, but in order to access all the item of it, we need to write the 03:54.140 --> 04:00.590 following open and other square brackets and write the index of specific item without. 04:01.070 --> 04:04.130 And you see to which is the second item of the second array. 04:04.850 --> 04:05.360 All right. 04:06.300 --> 04:11.610 As we said, we can pass into any kind of data type and even the functions. 04:12.320 --> 04:13.660 Let's see how to do it. 04:14.360 --> 04:19.200 But before that, let's organize our code, make some white spaces here. 04:20.000 --> 04:26.180 You may remember that JavaScript allows us to use multiple white spaces for better readability. 04:27.610 --> 04:29.560 Then right function. 04:31.280 --> 04:36.710 In this case, we don't need to assign a name to the function because we can call it using variable 04:36.710 --> 04:42.830 name and proper index number, as you remember, this kind of functions are called anonymous functions 04:42.830 --> 04:45.170 because they don't have names. 04:46.140 --> 04:56.820 Let's pass here the parameter name and then inside curly braces, right, return hello, plus name. 04:59.470 --> 05:02.800 At first, let's access on the function itself, right? 05:04.000 --> 05:11.790 Index number six, reload, and we have our function here in order to invoke it. 05:11.830 --> 05:16.030 We just need to add parentheses after the square brackets. 05:16.390 --> 05:24.640 And also as the argument, let's pass the first item of the array, which is John, and which has the 05:24.640 --> 05:25.780 index number zero. 05:27.320 --> 05:32.240 Without and the function is called and the code is executed. 05:32.540 --> 05:33.210 We have here. 05:33.260 --> 05:34.040 Hello, John. 05:35.690 --> 05:36.230 All right. 05:37.530 --> 05:42.870 We can create a race using another method, which is called a right constructor, for that, we need 05:43.020 --> 05:45.340 keyword new, which is an operator. 05:46.350 --> 05:48.570 It's followed by the word array. 05:50.290 --> 05:52.180 Starting with Capital Letter. 05:53.250 --> 05:57.060 And inside the parentheses, we can pass a list of values. 06:00.890 --> 06:03.620 Let's look right in council. 06:06.330 --> 06:10.410 And you see that we have here our newly created a right. 06:12.230 --> 06:18.470 All right, using first method, which was literal notation, is much better than a constructor because 06:18.470 --> 06:23.140 of less typing and also for simplicity, readability and execution speed. 06:23.750 --> 06:25.850 So I recommend all ways to use it. 06:27.370 --> 06:33.170 OK, in this lecture, we have considered what our rights are, how to create them with literal notation 06:33.170 --> 06:34.890 and eRate constructor. 06:35.510 --> 06:38.810 As for the array methods, see you in the next video.