1 00:00:01,060 --> 00:00:01,990 In this video. 2 00:00:01,990 --> 00:00:07,450 Let's talk about another property and methods that we can use to operate on strings. 3 00:00:07,780 --> 00:00:13,260 So in this video, we will talk about three of the methods because they are simple to use. 4 00:00:13,270 --> 00:00:19,590 And after that we're going to have our another coding challenge or have a coding challenge. 5 00:00:19,600 --> 00:00:20,980 So let's comment out. 6 00:00:20,980 --> 00:00:23,850 This one's the one we solved here. 7 00:00:23,860 --> 00:00:24,460 This one. 8 00:00:24,700 --> 00:00:25,330 So. 9 00:00:25,840 --> 00:00:26,020 Okay. 10 00:00:26,110 --> 00:00:28,900 I can leave it because I'm not console.log anything here. 11 00:00:29,290 --> 00:00:34,720 So here the methods that we are going to talk about right now is what let me have. 12 00:00:35,320 --> 00:00:37,420 The first one is called trim. 13 00:00:38,760 --> 00:00:41,430 And then next I'm going to be to. 14 00:00:43,630 --> 00:00:46,960 Uppercase and then to. 15 00:00:48,600 --> 00:00:55,170 Lowercase and then lowercase and then talk about index of. 16 00:00:55,820 --> 00:00:58,490 So let's start with the trim. 17 00:00:59,240 --> 00:01:00,580 So let's start with the trim. 18 00:01:00,590 --> 00:01:09,220 So the trim is used to remove wide spacing around a particular string that is from side by side. 19 00:01:09,230 --> 00:01:15,410 So like I explained to you before that we're not trying to find a length of a certain character. 20 00:01:15,410 --> 00:01:18,320 It takes the white spacing into consideration. 21 00:01:18,410 --> 00:01:23,180 So white spacing simply means that spacing around a particular text. 22 00:01:23,180 --> 00:01:24,710 So let me show you what I'm in here. 23 00:01:25,100 --> 00:01:27,410 Let's declare a variable cost. 24 00:01:27,410 --> 00:01:32,060 And let's say this My string is equal to quoting time. 25 00:01:34,170 --> 00:01:34,930 Like that. 26 00:01:34,950 --> 00:01:41,010 So for this one, there is no wide spacing because there is no space around the text here. 27 00:01:41,340 --> 00:01:41,930 Okay. 28 00:01:41,940 --> 00:01:49,440 So as soon as I bring some spacing here, this vertical wide spacing, if I save it, it's still there. 29 00:01:49,440 --> 00:01:50,010 Right. 30 00:01:50,190 --> 00:01:56,510 So to remove that, make sure you have some consistency in your data, in your application. 31 00:01:56,520 --> 00:01:58,900 You need to trim that particular test. 32 00:01:59,100 --> 00:01:59,730 You need to what? 33 00:01:59,730 --> 00:02:04,380 Sanitize it, scrutinize it to make it the way you want. 34 00:02:04,410 --> 00:02:08,400 So because of that, you're going to use a method called trim. 35 00:02:08,400 --> 00:02:15,480 So let me declare a variable core result is equal to my string and then trim. 36 00:02:16,130 --> 00:02:18,020 I have that as a method. 37 00:02:18,290 --> 00:02:18,840 Great. 38 00:02:18,860 --> 00:02:29,000 So now let me console.log this one console that log the SD or the original one like that and then dart 39 00:02:29,000 --> 00:02:29,750 length. 40 00:02:31,030 --> 00:02:32,050 That the first one. 41 00:02:32,710 --> 00:02:36,550 And then after I trim it, I want to find the results. 42 00:02:37,150 --> 00:02:40,350 The console log, the results dot lamp. 43 00:02:40,360 --> 00:02:43,690 I don't know whether indeed it has been trimmed. 44 00:02:43,690 --> 00:02:47,440 For the meantime, let's remove the method here. 45 00:02:47,470 --> 00:02:49,090 Let me show you something here. 46 00:02:49,780 --> 00:02:52,320 If I save it, you can see that. 47 00:02:52,330 --> 00:02:54,010 Have a look at differences here. 48 00:02:54,960 --> 00:03:00,890 If we see that for the first one that has peace in Syria as I'm facing here, but we cannot see how 49 00:03:01,020 --> 00:03:03,330 they can as well as push to the side. 50 00:03:04,380 --> 00:03:10,230 But after I trim it because I remove the white space and that's why I have it be on this side or look 51 00:03:10,230 --> 00:03:10,890 at this one. 52 00:03:11,010 --> 00:03:12,240 There's some space here. 53 00:03:12,450 --> 00:03:20,250 And as that, let me prove to you, well, this one is supposed to be here and then supposed to what? 54 00:03:20,250 --> 00:03:21,540 And here. 55 00:03:22,140 --> 00:03:28,110 But because this one has some white space and just push, it has a space and then push it to the side. 56 00:03:28,230 --> 00:03:30,780 So that is that is how the dream weighs. 57 00:03:30,780 --> 00:03:34,860 It's really I mean, nice method we need to understand. 58 00:03:35,100 --> 00:03:41,910 So again, if I want to find the length of this particular before Trymaine and then after Trymaine, 59 00:03:42,210 --> 00:03:48,750 let's see after Trymaine, we see that the first one, because I have some space in it, has given me 60 00:03:48,750 --> 00:03:51,870 16 characters, which is which is weird. 61 00:03:51,870 --> 00:03:57,930 And then this one after Trymaine, I got 16 characters, meaning I have trimmed five off. 62 00:03:58,080 --> 00:03:59,280 That's about a trim. 63 00:03:59,610 --> 00:04:04,230 The next one is so let me remove this one from here. 64 00:04:04,260 --> 00:04:05,390 I can comment out. 65 00:04:05,400 --> 00:04:08,230 Yeah, okay. 66 00:04:08,430 --> 00:04:09,210 Yeah, yeah. 67 00:04:09,570 --> 00:04:11,700 Let me comment out the next one. 68 00:04:11,700 --> 00:04:14,730 Let's talk about the two uppercase and to lowercase. 69 00:04:14,730 --> 00:04:17,490 As the name implies, it is to convert. 70 00:04:18,550 --> 00:04:24,210 A string from lowercase to uppercase and uppercase to lowercase and vice versa. 71 00:04:24,330 --> 00:04:29,970 So this one going to be to lowercase and to uppercase. 72 00:04:30,000 --> 00:04:33,120 So let's have the same text as code in time. 73 00:04:33,120 --> 00:04:35,310 So it comes code in times I'm around. 74 00:04:35,310 --> 00:04:37,160 Let me make it nice. 75 00:04:37,170 --> 00:04:38,370 I want to trim it. 76 00:04:39,000 --> 00:04:42,090 So let's say for the uppercase. 77 00:04:42,890 --> 00:04:46,110 So let me console.log quickly here, because it is a simple method. 78 00:04:46,130 --> 00:04:47,960 There's no time to waste on this one. 79 00:04:47,960 --> 00:04:50,060 And let's start with our coding challenge. 80 00:04:50,090 --> 00:04:55,100 So on a string I have a method called to lowercase. 81 00:04:56,200 --> 00:04:57,220 To. 82 00:04:58,640 --> 00:05:04,700 Lowercase and then if I save it, we see that it has converted everything to lowercase even though it 83 00:05:04,700 --> 00:05:05,280 is uppercase. 84 00:05:05,280 --> 00:05:10,730 So let me make everything uppercase here as codeine and then type. 85 00:05:11,840 --> 00:05:14,690 You see that test converted everything to lowercase. 86 00:05:14,780 --> 00:05:18,110 So four lowercase h two lowercase. 87 00:05:18,110 --> 00:05:21,080 So for uppercase the same as to. 88 00:05:23,040 --> 00:05:24,630 To uppercase. 89 00:05:24,990 --> 00:05:29,280 So if I change this one to everything, I mean lowercase, let's say coding. 90 00:05:31,780 --> 00:05:38,620 Accordion time if I save it, see that it has converted everything to uppercase. 91 00:05:38,740 --> 00:05:45,730 The last method we are going to use, then we start our coding challenge is what we call the index of. 92 00:05:48,500 --> 00:05:54,860 Because we need this logic before we can solve the we can solve the challenge of the coding. 93 00:05:55,250 --> 00:05:57,800 That's why I am explaining to you before we start with that. 94 00:05:57,800 --> 00:06:06,410 So index of well the index of is used to determine at which particular point a certain character appears 95 00:06:06,680 --> 00:06:07,660 or is. 96 00:06:07,670 --> 00:06:08,540 So let's say that. 97 00:06:08,540 --> 00:06:10,850 Let me bring back this string here. 98 00:06:11,040 --> 00:06:11,960 Call. 99 00:06:12,890 --> 00:06:14,870 Costs as are coding time. 100 00:06:14,900 --> 00:06:22,280 If I want to know at which index once the index simply means at which place that a particular character 101 00:06:22,370 --> 00:06:23,300 exists. 102 00:06:23,300 --> 00:06:27,260 We have a specific video to dive more about a race. 103 00:06:27,260 --> 00:06:29,240 For the meantime, just bear with me. 104 00:06:29,270 --> 00:06:38,750 So I rest I index base zero base meaning that is start from zero when you count 0123456, seven, eight, 105 00:06:38,750 --> 00:06:39,440 nine, ten. 106 00:06:39,440 --> 00:06:49,790 So let's find out what index that see okay so on the start my string dot index of now to find at which 107 00:06:49,790 --> 00:06:53,870 index does this C or K, so I'll pass in C. 108 00:06:54,780 --> 00:06:55,500 Like that. 109 00:06:55,620 --> 00:06:57,570 So let me console.log the results. 110 00:06:57,570 --> 00:06:59,220 So const. 111 00:07:00,370 --> 00:07:02,920 Results is equal to that. 112 00:07:04,390 --> 00:07:05,650 Is equal to that. 113 00:07:05,680 --> 00:07:06,130 Yes. 114 00:07:06,130 --> 00:07:09,700 So if I console.log the results. 115 00:07:09,760 --> 00:07:11,040 Let's see it. 116 00:07:11,050 --> 00:07:11,920 Okay. 117 00:07:11,950 --> 00:07:13,870 At index zero. 118 00:07:13,900 --> 00:07:14,710 That is it. 119 00:07:15,040 --> 00:07:19,600 So 4d404040. 120 00:07:19,600 --> 00:07:22,640 Here it occurred at index one. 121 00:07:22,660 --> 00:07:24,600 That's why we have it here. 122 00:07:24,610 --> 00:07:25,420 Remember? 123 00:07:25,870 --> 00:07:27,940 Index of r k sensitive. 124 00:07:27,940 --> 00:07:30,310 Meaning that this one is. 125 00:07:31,230 --> 00:07:35,340 Uppercase A lowercase C and you pass in uppercase C. 126 00:07:36,930 --> 00:07:38,730 We're going to have some strange results. 127 00:07:39,030 --> 00:07:40,910 You see that negative one. 128 00:07:40,920 --> 00:07:44,880 So if a value doesn't exist, it returns. 129 00:07:44,880 --> 00:07:46,710 What negative one? 130 00:07:46,800 --> 00:07:53,460 And we can make use of in this off to make a little of logic meaning if you're are trying to find if 131 00:07:53,460 --> 00:08:00,900 a certain letter appears in a maybe some characters or where appears in certain string to ten minus 132 00:08:00,900 --> 00:08:07,380 one, which doesn't exist, for example, we can have a list of uses and we want to search for a certain 133 00:08:07,410 --> 00:08:14,040 user if you pass in and that user doesn't exist, the index of is going to return negative one. 134 00:08:14,370 --> 00:08:17,040 So let's say that I want to find four time. 135 00:08:18,160 --> 00:08:19,560 Here if I save it. 136 00:08:19,570 --> 00:08:22,480 Yes, it's worked at index seven. 137 00:08:22,480 --> 00:08:23,590 Meaning it exists. 138 00:08:23,590 --> 00:08:24,790 That's why we have it here. 139 00:08:25,180 --> 00:08:34,299 So the key note here is that the index of always gives you a negative one if it doesn't exist and it 140 00:08:34,299 --> 00:08:38,799 gave it a number at where it occurred, if it exists. 141 00:08:39,130 --> 00:08:48,070 So on that note, let's have our first challenge under trim and index off in the next video.