WEBVTT 1 00:00:01.310 --> 00:00:02.930 Over the next few lectures, 2 00:00:02.930 --> 00:00:06.280 we will learn how to work with strings 3 00:00:06.280 --> 00:00:08.130 and so we're gonna be taking a look 4 00:00:08.130 --> 00:00:11.230 at a couple of useful string methods. 5 00:00:11.230 --> 00:00:14.160 Now I could have divided this part about strings 6 00:00:14.160 --> 00:00:15.610 into many more lectures 7 00:00:15.610 --> 00:00:18.780 and go really deep into some topics 8 00:00:18.780 --> 00:00:22.170 but I think it's best to just quickly introduce you 9 00:00:22.170 --> 00:00:23.950 to all the topics here 10 00:00:23.950 --> 00:00:26.800 and then keep using them in future projects 11 00:00:26.800 --> 00:00:30.700 because we work with strings all the time in JavaScript 12 00:00:30.700 --> 00:00:33.330 and so you will see these methods being used 13 00:00:33.330 --> 00:00:36.400 all the time throughout the rest of the course. 14 00:00:36.400 --> 00:00:39.080 Anyway, this is gonna be really fun 15 00:00:39.080 --> 00:00:40.653 so let's get started. 16 00:00:42.210 --> 00:00:43.950 And in this part of the section, 17 00:00:43.950 --> 00:00:46.850 we're gonna leave the restaurant theme behind 18 00:00:46.850 --> 00:00:51.590 and work on stuff related to airplanes and airlines. 19 00:00:51.590 --> 00:00:54.360 So that's something that I really like. 20 00:00:54.360 --> 00:00:59.360 So let's now start by creating an airline variable here 21 00:01:00.530 --> 00:01:03.283 and I'm using TAP Air Portugal. 22 00:01:06.920 --> 00:01:10.740 All right, and if you want, you can use some other one 23 00:01:10.740 --> 00:01:12.163 from your country maybe, 24 00:01:13.100 --> 00:01:16.340 but then you might have to adapt the examples. 25 00:01:16.340 --> 00:01:17.540 So as a plane, 26 00:01:17.540 --> 00:01:20.843 I'm using a string A320. 27 00:01:21.710 --> 00:01:22.543 Okay. 28 00:01:22.543 --> 00:01:25.300 And now let's do some stuff with this. 29 00:01:25.300 --> 00:01:26.600 So just like in arrays, 30 00:01:26.600 --> 00:01:30.923 we can get the character of a string at a certain position. 31 00:01:31.970 --> 00:01:36.290 So for example, plane at position zero 32 00:01:36.290 --> 00:01:38.750 should be A, right? 33 00:01:38.750 --> 00:01:41.550 So let's load this here. 34 00:01:41.550 --> 00:01:42.777 And indeed we got A 35 00:01:43.775 --> 00:01:46.363 and the same of course for all the other letters, 36 00:01:47.450 --> 00:01:49.990 one, two for example. 37 00:01:49.990 --> 00:01:53.730 And so indeed you now get three and two here 38 00:01:53.730 --> 00:01:56.370 but both of them are still strings. 39 00:01:56.370 --> 00:01:58.570 So if we wanted them to be numbers, 40 00:01:58.570 --> 00:02:03.036 we would have to convert them and we can do the same 41 00:02:03.036 --> 00:02:05.333 directly on a string. 42 00:02:06.440 --> 00:02:11.150 So we can just write a string and let's write B727 now, 43 00:02:11.150 --> 00:02:15.263 which is a Boeing and so this works the same. 44 00:02:16.630 --> 00:02:18.910 Okay so now we got to the B, 45 00:02:18.910 --> 00:02:22.133 we can also read the length property of strings, 46 00:02:23.369 --> 00:02:25.590 just like we can in arrays. 47 00:02:25.590 --> 00:02:29.470 So let's say airline.length. 48 00:02:29.470 --> 00:02:32.513 And again we can also do that directly on the string. 49 00:02:36.590 --> 00:02:37.840 Okay. 50 00:02:37.840 --> 00:02:38.673 There you go. 51 00:02:39.520 --> 00:02:42.330 Next up let's talk about methods. 52 00:02:42.330 --> 00:02:45.560 So again comparing strings to arrays here, 53 00:02:45.560 --> 00:02:48.180 strings also have methods 54 00:02:48.180 --> 00:02:52.170 and some of them are quite similar to the array methods. 55 00:02:52.170 --> 00:02:54.713 So one of them is the index off. 56 00:02:56.250 --> 00:02:58.870 So I believe we talked about this one 57 00:02:58.870 --> 00:03:00.795 when we talked about a array. 58 00:03:00.795 --> 00:03:02.760 And so this one works the same way, 59 00:03:02.760 --> 00:03:05.754 so we can get the position in which a certain letter 60 00:03:05.754 --> 00:03:07.770 is in the string. 61 00:03:07.770 --> 00:03:09.343 So let's use r here. 62 00:03:11.190 --> 00:03:14.490 And so here we now get to position number six. 63 00:03:14.490 --> 00:03:19.490 And so let's see zero, one, two, three, four, five and six. 64 00:03:21.740 --> 00:03:24.713 Okay and that's where the six here comes from. 65 00:03:25.830 --> 00:03:30.130 So you'll see that strings are also zero-based right? 66 00:03:30.130 --> 00:03:32.973 And we could observe that already up here. 67 00:03:33.890 --> 00:03:37.290 Now this here will only give us the first occurrence 68 00:03:37.290 --> 00:03:40.090 but sometimes we might need the last one. 69 00:03:40.090 --> 00:03:42.323 And so then we can use lastIndexOf, 70 00:03:45.860 --> 00:03:49.940 lastIndexOf and so that is 10. 71 00:03:49.940 --> 00:03:53.040 So this one was six then seven, 72 00:03:53.040 --> 00:03:56.780 because the space of course also counts as a character, 73 00:03:56.780 --> 00:03:59.523 then eight, nine, and this is position 10. 74 00:04:00.840 --> 00:04:05.683 Alright and we can also search for entire words. 75 00:04:10.260 --> 00:04:14.313 For example, for the occurrence of Portugal, 76 00:04:15.280 --> 00:04:17.530 and so that is at position eight, 77 00:04:17.530 --> 00:04:20.040 and this one is actually case sensitive. 78 00:04:20.040 --> 00:04:22.460 So if I search with lowercase, 79 00:04:22.460 --> 00:04:24.080 then we get minus one, 80 00:04:24.080 --> 00:04:26.350 because this can now not be found 81 00:04:26.350 --> 00:04:29.010 in this airline's string. 82 00:04:29.010 --> 00:04:34.010 All right now, what can we actually do with these indexes? 83 00:04:34.180 --> 00:04:36.050 Why are they useful? 84 00:04:36.050 --> 00:04:39.610 Well, one good use case is to extract part 85 00:04:39.610 --> 00:04:42.800 of a string using the slice method 86 00:04:42.800 --> 00:04:46.390 and a slice method needs indexes as arguments. 87 00:04:46.390 --> 00:04:49.280 And so therefore sometimes it can be very useful 88 00:04:49.280 --> 00:04:52.900 to first figure out the index of part of a string 89 00:04:52.900 --> 00:04:54.940 to then extract that. 90 00:04:54.940 --> 00:04:59.623 So let's see how the slice method works. 91 00:05:02.470 --> 00:05:06.140 So airline and then dot slice, 92 00:05:06.140 --> 00:05:09.583 and let's write four and see the result here. 93 00:05:10.810 --> 00:05:15.090 All right so the result is Air Portugal. 94 00:05:15.090 --> 00:05:17.870 And the reason for that is that this here 95 00:05:17.870 --> 00:05:19.660 is the begin parameter. 96 00:05:19.660 --> 00:05:21.930 So basically it's the position at which 97 00:05:21.930 --> 00:05:23.763 the extraction will start. 98 00:05:24.960 --> 00:05:27.970 And remember that this is zero based. 99 00:05:27.970 --> 00:05:31.870 So zero, one, two, three, and four. 100 00:05:31.870 --> 00:05:34.580 So four happens to be this A. 101 00:05:34.580 --> 00:05:38.663 And so this is where the slice method starts to extract. 102 00:05:38.663 --> 00:05:41.502 And this result that we get here, 103 00:05:41.502 --> 00:05:45.250 so just this here is called a substring 104 00:05:45.250 --> 00:05:48.981 because it's just a part of the original string. 105 00:05:48.981 --> 00:05:52.870 Now this does not change the underlying string okay? 106 00:05:52.870 --> 00:05:54.600 Just keep that in mind. 107 00:05:54.600 --> 00:05:58.410 That's because it's actually impossible to mutate strings. 108 00:05:58.410 --> 00:06:00.000 They are primitives, right? 109 00:06:00.000 --> 00:06:02.880 So if we wanted to use this string 110 00:06:02.880 --> 00:06:06.475 now we would have to store it first into some variable 111 00:06:06.475 --> 00:06:08.800 or some data structure. 112 00:06:08.800 --> 00:06:13.170 Okay, so this method here and all the other ones 113 00:06:13.170 --> 00:06:17.230 that we're gonna talk about always return a new string. 114 00:06:17.230 --> 00:06:20.680 Okay and so that's why we can then lock that result 115 00:06:20.680 --> 00:06:22.283 to the console like this. 116 00:06:23.240 --> 00:06:27.060 Now, besides the begin parameter that we already specified, 117 00:06:27.060 --> 00:06:30.630 we can also specify an end parameter. 118 00:06:30.630 --> 00:06:32.733 So let's try seven and see the result. 119 00:06:33.850 --> 00:06:36.390 And so now we only got air. 120 00:06:36.390 --> 00:06:41.390 Okay so this one is four, then five, six 121 00:06:41.660 --> 00:06:43.560 and seven is the space here. 122 00:06:43.560 --> 00:06:46.460 And so what this means is that the end value 123 00:06:46.460 --> 00:06:49.650 is actually not included in the string. 124 00:06:49.650 --> 00:06:52.840 All right so basically it stops extracting 125 00:06:52.840 --> 00:06:55.610 before reaching index number seven. 126 00:06:55.610 --> 00:06:58.060 And that's really important to keep in mind. 127 00:06:58.060 --> 00:06:59.700 And just as a side note, 128 00:06:59.700 --> 00:07:02.019 the length of the extracted string 129 00:07:02.019 --> 00:07:05.550 is always going to be end minus beginning. 130 00:07:05.550 --> 00:07:07.910 So seven minus four is three. 131 00:07:07.910 --> 00:07:10.710 And so that's the length here of air. 132 00:07:10.710 --> 00:07:14.150 All right, okay. 133 00:07:14.150 --> 00:07:16.070 Now up until this point, 134 00:07:16.070 --> 00:07:19.350 we have always just hard-coded these values, 135 00:07:19.350 --> 00:07:22.333 but ofcourse many times we don't even know the string 136 00:07:22.333 --> 00:07:24.508 that we receive yet okay? 137 00:07:24.508 --> 00:07:28.472 And so let's now try to extract just the first word 138 00:07:28.472 --> 00:07:30.147 of this string here, 139 00:07:30.147 --> 00:07:33.490 but without knowing any of the indexes. 140 00:07:33.490 --> 00:07:36.450 And so that's where this IndexOf, 141 00:07:36.450 --> 00:07:40.100 and lastIndexOf here become really important. 142 00:07:40.100 --> 00:07:43.310 So basically that we do not have to hard code 143 00:07:43.310 --> 00:07:44.823 these values here. 144 00:07:46.100 --> 00:07:50.820 All right so let's try to extract that first word 145 00:07:50.820 --> 00:07:51.803 as I was saying. 146 00:07:54.650 --> 00:07:56.910 Airline.slice 147 00:07:56.910 --> 00:07:59.790 and now we need to figure out the index. 148 00:07:59.790 --> 00:08:04.790 And now if we want the first word we need to start at zero, 149 00:08:04.840 --> 00:08:07.850 but what about the end parameter? 150 00:08:07.850 --> 00:08:12.620 Well we want to extract until this space here basically. 151 00:08:12.620 --> 00:08:14.823 So let's find the index of that. 152 00:08:16.060 --> 00:08:17.690 So airline.indexOf, 153 00:08:19.680 --> 00:08:22.751 and remember that this will be the first occurrence 154 00:08:22.751 --> 00:08:26.793 and so indeed we get top. 155 00:08:28.640 --> 00:08:32.040 All right and now let's do the opposite extracting 156 00:08:32.040 --> 00:08:36.890 the last word, so slice. 157 00:08:36.890 --> 00:08:38.070 And so for the last word, 158 00:08:38.070 --> 00:08:41.323 we want to start at the last space here. 159 00:08:42.410 --> 00:08:45.173 Okay that's why we have lastIndexOf. 160 00:08:46.760 --> 00:08:48.740 So airline.lastIndexOf 161 00:08:50.800 --> 00:08:53.200 and again searching for the space. 162 00:08:53.200 --> 00:08:55.560 And now we don't need the end parameter 163 00:08:55.560 --> 00:08:57.554 because then if we don't specify it, 164 00:08:57.554 --> 00:09:00.643 it will simply extract everything until the end. 165 00:09:01.720 --> 00:09:02.910 Okay. 166 00:09:02.910 --> 00:09:06.600 But actually now the space is also included here. 167 00:09:06.600 --> 00:09:09.893 And so we just need to add plus one, 168 00:09:11.270 --> 00:09:12.573 and now we're good. 169 00:09:14.550 --> 00:09:18.550 So that's the fundamentals of the slice method, 170 00:09:18.550 --> 00:09:21.183 but we can do even more with it. 171 00:09:22.380 --> 00:09:25.640 So let's go again here. 172 00:09:25.640 --> 00:09:29.740 And we can even define a negative begin argument. 173 00:09:29.740 --> 00:09:31.240 Like this for example, 174 00:09:31.240 --> 00:09:34.740 and then it will start counting from the end. 175 00:09:34.740 --> 00:09:37.513 Or actually start extracting from the end. 176 00:09:38.710 --> 00:09:42.500 So these are the last two letters from Portugal. 177 00:09:42.500 --> 00:09:45.830 And finally let's duplicate this one again. 178 00:09:45.830 --> 00:09:50.053 And again I'm using this shortcut here for duplicate. 179 00:09:51.140 --> 00:09:52.800 Okay. 180 00:09:52.800 --> 00:09:57.220 So we can also specify a negative end parameter. 181 00:09:57.220 --> 00:09:59.490 So the beginning is back to positive, 182 00:09:59.490 --> 00:10:02.150 and now the end is minus one. 183 00:10:02.150 --> 00:10:03.900 So let's see. 184 00:10:03.900 --> 00:10:06.793 And so basically we started at position one. 185 00:10:07.640 --> 00:10:09.840 So that's why the T is cut off. 186 00:10:09.840 --> 00:10:12.090 And then the negative end parameter, 187 00:10:12.090 --> 00:10:14.523 basically cuts off the last character. 188 00:10:15.720 --> 00:10:17.050 All right. 189 00:10:17.050 --> 00:10:18.540 And so we will need all of these 190 00:10:18.540 --> 00:10:20.230 different combinations here, 191 00:10:20.230 --> 00:10:22.160 in different situations. 192 00:10:22.160 --> 00:10:24.580 So it's good that you know how to use them, 193 00:10:24.580 --> 00:10:27.093 because you will need them at some point. 194 00:10:28.000 --> 00:10:28.833 Okay. 195 00:10:28.833 --> 00:10:30.730 And now let's practice a little bit, 196 00:10:30.730 --> 00:10:32.250 what we just learned 197 00:10:32.250 --> 00:10:36.120 and write a function that receives an airplane seat 198 00:10:36.120 --> 00:10:37.710 and locks to the console, 199 00:10:37.710 --> 00:10:40.870 whether it is a middle seat or not. 200 00:10:40.870 --> 00:10:43.760 I hope that sounds like fun. 201 00:10:43.760 --> 00:10:44.803 So let's write. 202 00:10:46.370 --> 00:10:47.690 Check, 203 00:10:47.690 --> 00:10:48.830 middle, 204 00:10:48.830 --> 00:10:49.663 seat. 205 00:10:50.640 --> 00:10:54.113 And it is a function which takes in a seat. 206 00:10:55.290 --> 00:10:57.860 And just to illustrate it, 207 00:10:57.860 --> 00:11:01.200 let me start by calling this function. 208 00:11:01.200 --> 00:11:02.763 To check middle seat. 209 00:11:03.830 --> 00:11:04.830 And so typically, 210 00:11:04.830 --> 00:11:07.380 an airplane seat looks like this. 211 00:11:07.380 --> 00:11:10.400 So we have the row as a number here 212 00:11:10.400 --> 00:11:12.280 and then the seat itself, 213 00:11:12.280 --> 00:11:14.897 so that's like the column so to say, 214 00:11:14.897 --> 00:11:18.360 it's then a letter for example a B. 215 00:11:18.360 --> 00:11:19.580 So it starts from the left 216 00:11:19.580 --> 00:11:22.140 and goes all the way to the right side. 217 00:11:22.140 --> 00:11:26.550 And in small planes, like the A320, or the Boeing 737, 218 00:11:26.550 --> 00:11:29.160 we only have six seats in one row. 219 00:11:29.160 --> 00:11:33.860 And that means that B and E are the middle seats. 220 00:11:33.860 --> 00:11:35.680 Let me just write that here. 221 00:11:35.680 --> 00:11:37.023 B and E, 222 00:11:38.470 --> 00:11:40.550 are middle seats. 223 00:11:40.550 --> 00:11:42.280 So just in case you're not familiar 224 00:11:42.280 --> 00:11:45.100 with how these small planes works. 225 00:11:45.100 --> 00:11:45.933 Right. 226 00:11:45.933 --> 00:11:48.570 And that's also not the point here of course. 227 00:11:48.570 --> 00:11:50.750 So basically all we want to do is to check 228 00:11:50.750 --> 00:11:52.880 if the string that we receive, 229 00:11:52.880 --> 00:11:54.720 contains a, B or an E. 230 00:11:54.720 --> 00:11:56.513 And if so, then it's a middle seat. 231 00:11:57.760 --> 00:12:01.090 And let's call this with a couple of different strings. 232 00:12:01.090 --> 00:12:02.130 So 23C 233 00:12:07.303 --> 00:12:08.136 and 3E. 234 00:12:10.120 --> 00:12:14.250 All right, so what we need to do here is basically 235 00:12:14.250 --> 00:12:17.400 take the last character of the string 236 00:12:17.400 --> 00:12:21.283 and test whether it is a B or an E right? 237 00:12:22.510 --> 00:12:25.530 So let's get that letter from the seat. 238 00:12:25.530 --> 00:12:28.570 Now we'll just call it S for seat again, 239 00:12:28.570 --> 00:12:31.280 but I cannot repeat the same name here. 240 00:12:31.280 --> 00:12:33.523 So how do I do that now? 241 00:12:34.980 --> 00:12:37.300 Well to extract part of a string, 242 00:12:37.300 --> 00:12:40.796 we already know we use the slice method 243 00:12:40.796 --> 00:12:44.962 and how do we take the last character of a certain string? 244 00:12:44.962 --> 00:12:49.280 Well, we use minus one as the begin character. 245 00:12:49.280 --> 00:12:51.207 And then as we saw up here, 246 00:12:51.207 --> 00:12:55.473 it will start counting basically one from the right side. 247 00:12:56.400 --> 00:12:57.963 And now it's very easy. 248 00:12:59.540 --> 00:13:03.610 If S equals B 249 00:13:04.708 --> 00:13:09.708 or if S equals E, 250 00:13:12.070 --> 00:13:13.763 then let's log to the console, 251 00:13:15.270 --> 00:13:18.065 you got the middle seat, 252 00:13:18.065 --> 00:13:20.960 which is the one that no one wants. 253 00:13:20.960 --> 00:13:23.923 Well, let's add an emoji here. 254 00:13:26.270 --> 00:13:27.200 Let's say this one 255 00:13:28.740 --> 00:13:29.590 or else 256 00:13:33.880 --> 00:13:36.633 you got lucky, 257 00:13:39.220 --> 00:13:40.370 just any emoji here, 258 00:13:40.370 --> 00:13:42.030 just to make it different 259 00:13:43.030 --> 00:13:45.030 and I think we are good now. 260 00:13:45.030 --> 00:13:45.913 Let's test it. 261 00:13:47.010 --> 00:13:50.950 And so indeed this here contains the B at the end. 262 00:13:50.950 --> 00:13:52.840 And so therefore it's a middle seat, 263 00:13:52.840 --> 00:13:55.020 the same for this one 264 00:13:55.020 --> 00:13:58.653 and this person with this seat got lucky. 265 00:13:59.490 --> 00:14:03.900 All right and that's how we extract parts of strings. 266 00:14:03.900 --> 00:14:06.800 And that's something really important to do. 267 00:14:06.800 --> 00:14:08.160 So maybe if you'd like, 268 00:14:08.160 --> 00:14:10.160 you can play around with this some more, 269 00:14:10.160 --> 00:14:12.740 maybe come up with your own example. 270 00:14:12.740 --> 00:14:14.490 Now before we move on here, 271 00:14:14.490 --> 00:14:16.950 let's just stop for a second 272 00:14:16.950 --> 00:14:20.730 and understand why all of this actually works. 273 00:14:20.730 --> 00:14:23.900 So we know that strings are just primitives. 274 00:14:23.900 --> 00:14:26.500 So why do they have methods? 275 00:14:26.500 --> 00:14:28.710 Shouldn't methods only be available 276 00:14:28.710 --> 00:14:31.214 on objects such as a race? 277 00:14:31.214 --> 00:14:33.840 Well that is actually true. 278 00:14:33.840 --> 00:14:37.010 However, JavaScript is really smart. 279 00:14:37.010 --> 00:14:39.190 And so here is how this works. 280 00:14:39.190 --> 00:14:41.960 Whenever we call a method on a string, 281 00:14:41.960 --> 00:14:45.230 JavaScript will automatically behind the scenes 282 00:14:45.230 --> 00:14:49.080 convert that string primitive to a string object 283 00:14:49.080 --> 00:14:50.940 with the same content. 284 00:14:50.940 --> 00:14:55.220 And then it's on that object where the methods are called. 285 00:14:55.220 --> 00:14:58.850 All right and this process is called boxing 286 00:14:58.850 --> 00:15:01.370 because it basically takes our string 287 00:15:01.370 --> 00:15:03.460 and puts it into a box 288 00:15:03.460 --> 00:15:05.510 which is the object. 289 00:15:05.510 --> 00:15:08.253 So basically what happens is this. 290 00:15:11.820 --> 00:15:14.163 So what JavaScript does, 291 00:15:15.190 --> 00:15:17.363 is to call this string function here. 292 00:15:20.980 --> 00:15:21.813 Okay. 293 00:15:21.813 --> 00:15:24.960 And so now you'll see, that this string here, 294 00:15:24.960 --> 00:15:27.860 looks a little bit more like an object. 295 00:15:27.860 --> 00:15:29.920 And we could take a look at this here. 296 00:15:29.920 --> 00:15:32.883 And so you see here, all of these methods, 297 00:15:33.840 --> 00:15:36.690 like slice that we just use. 298 00:15:36.690 --> 00:15:38.700 But this is beyond the scope of this lecture. 299 00:15:38.700 --> 00:15:42.210 We will learn what this is a little bit later. 300 00:15:42.210 --> 00:15:46.713 But what matters is that this indeed is now an object. 301 00:15:48.380 --> 00:15:50.580 So you see it is an object. 302 00:15:50.580 --> 00:15:52.400 And so this conversion here 303 00:15:52.400 --> 00:15:54.930 is what JavaScript does behind the scenes 304 00:15:54.930 --> 00:15:58.450 whenever we call a method on a string. 305 00:15:58.450 --> 00:16:01.020 And then when the operation is done 306 00:16:01.020 --> 00:16:05.200 the object is converted back to a regular string primitive. 307 00:16:05.200 --> 00:16:06.400 Okay. 308 00:16:06.400 --> 00:16:09.740 And in fact all string methods return primitives. 309 00:16:09.740 --> 00:16:12.733 Even if called on a string object. 310 00:16:13.640 --> 00:16:16.773 So let me demonstrate us here as well. 311 00:16:19.930 --> 00:16:21.163 Just really quick. 312 00:16:25.260 --> 00:16:27.113 And actually we want your type off. 313 00:16:29.760 --> 00:16:31.750 And so the result of all of this, 314 00:16:31.750 --> 00:16:33.683 is then back to being a string. 315 00:16:35.640 --> 00:16:37.623 Okay, but don't get confused by this. 316 00:16:37.623 --> 00:16:40.210 This is just a theory explanation 317 00:16:40.210 --> 00:16:44.030 behind why all of this works in case you're curious. 318 00:16:44.030 --> 00:16:45.870 And I hope you are. 319 00:16:45.870 --> 00:16:46.703 Great. 320 00:16:46.703 --> 00:16:48.520 But now let's move on to the next video, 321 00:16:48.520 --> 00:16:51.163 where we will continue working with strings.