1 00:00:01,460 --> 00:00:02,840 Hey What's up everybody. 2 00:00:02,880 --> 00:00:09,300 Mark Price slopes dot com plugging our way through foundational swift and programming them not only 3 00:00:09,300 --> 00:00:14,700 teach India SWIP but I'm teaching underlying core programming principles that you use with you in any 4 00:00:14,700 --> 00:00:15,540 programming language. 5 00:00:15,540 --> 00:00:17,200 So this is really good stuff. 6 00:00:17,220 --> 00:00:18,210 Take it in here. 7 00:00:18,240 --> 00:00:24,870 Go ahead and open up your X code 8 and we're going to get started with a playground and this one we're 8 00:00:24,870 --> 00:00:37,080 going to call bulls not to be confused with like a bull with horns bulls and conditionals and comparison 9 00:00:37,440 --> 00:00:39,160 operators. 10 00:00:41,780 --> 00:00:55,600 Create a folder for this swift and mostly tables and compare lists and account and create. 11 00:00:55,600 --> 00:01:00,440 So a boolean is true or false. 12 00:01:00,480 --> 00:01:02,710 Simple enough. 13 00:01:02,710 --> 00:01:07,140 So far we've kind of done this once before. 14 00:01:07,140 --> 00:01:07,410 Right. 15 00:01:07,410 --> 00:01:09,000 Bar. 16 00:01:09,870 --> 00:01:17,990 Am I in my the best teacher ever equals. 17 00:01:18,150 --> 00:01:20,800 What's that Jennifer says. 18 00:01:20,800 --> 00:01:21,270 True. 19 00:01:21,340 --> 00:01:22,450 Thanks Jennifer. 20 00:01:22,450 --> 00:01:22,740 OK. 21 00:01:22,740 --> 00:01:24,540 So am I the best teacher ever. 22 00:01:25,030 --> 00:01:25,780 Well thank you. 23 00:01:25,930 --> 00:01:30,620 I wouldn't say that about myself because that would be narcissistic. 24 00:01:30,700 --> 00:01:31,570 So that's a billion. 25 00:01:31,600 --> 00:01:32,380 It's true. 26 00:01:32,590 --> 00:01:37,140 And you know but it can also be false can be anything else so. 27 00:01:37,410 --> 00:01:39,270 So am I the best teacher ever. 28 00:01:39,270 --> 00:01:45,880 Well let's say the ExCo just keeps crashing and you're getting sick of watching me have X code crash 29 00:01:46,090 --> 00:01:47,130 and you're just angry. 30 00:01:47,170 --> 00:01:53,800 And so now you want to set this false because X Courcy's it's not my fault is crashing. 31 00:01:53,800 --> 00:01:56,470 Don't get on my case don't get on my case. 32 00:01:56,470 --> 00:01:58,310 So am I the best teacher ever. 33 00:01:58,570 --> 00:02:02,850 I'm no longer the best teacher ever because this keeps up to us. 34 00:02:03,250 --> 00:02:09,520 And you know I actually do cut out a lot of the a lot of the crashes but I at least some of them in 35 00:02:09,520 --> 00:02:14,440 there so you can know that again real life development you see in the flesh there. 36 00:02:14,440 --> 00:02:17,970 So am I the best teacher ever is now false because it keeps crashing. 37 00:02:18,010 --> 00:02:20,470 OK and I'm not cutting it out of the video. 38 00:02:21,190 --> 00:02:21,730 OK. 39 00:02:21,910 --> 00:02:23,770 Anyway so true or false. 40 00:02:23,800 --> 00:02:24,460 So what does that mean. 41 00:02:24,460 --> 00:02:26,960 Why does why does it mean that we are storing it. 42 00:02:27,070 --> 00:02:28,490 True or False variable. 43 00:02:28,900 --> 00:02:35,110 Well the funny thing is actually most of the time you're not storing true or false values in a variable. 44 00:02:35,110 --> 00:02:38,450 You will and I do it frequently but not all the time. 45 00:02:38,620 --> 00:02:47,980 Boolean values are sometimes more so used to just compare things or to not to do something based on 46 00:02:47,980 --> 00:02:49,230 some condition. 47 00:02:49,460 --> 00:02:51,080 OK. 48 00:02:51,370 --> 00:02:51,610 Right. 49 00:02:51,610 --> 00:02:54,120 Does that make any sense you want to do something based. 50 00:02:54,160 --> 00:02:54,970 Should I get this. 51 00:02:54,970 --> 00:03:01,910 You know if you know when you were a kid remember when you were a kid and your parents were like Yo 52 00:03:02,140 --> 00:03:07,450 if you clean your room and do your chores we're going to go to Disneyland otherwise I'm going to take 53 00:03:07,450 --> 00:03:09,960 this big black belt with these spikes on it. 54 00:03:09,970 --> 00:03:15,520 I'm going to beat you because a rough child anyway. 55 00:03:15,860 --> 00:03:17,780 Cause and effect or true or false. 56 00:03:17,840 --> 00:03:20,940 Bullying is a foundational principle for that. 57 00:03:21,640 --> 00:03:27,190 And this is again type inference here we're inferring it as well but the actual key word if you want 58 00:03:27,190 --> 00:03:30,430 to explicitly declare it is bull. 59 00:03:30,510 --> 00:03:30,920 OK. 60 00:03:31,000 --> 00:03:32,600 Not boolean. 61 00:03:32,760 --> 00:03:33,530 OK. 62 00:03:33,820 --> 00:03:36,000 Not boolean literal type converter but nothing else. 63 00:03:36,000 --> 00:03:36,880 OK just bull. 64 00:03:36,880 --> 00:03:38,460 And I'm not going to explain what these things are. 65 00:03:38,460 --> 00:03:43,630 If you're wondering what's the difference between bull and boolean Swift and I have the pop when autocomplete 66 00:03:43,630 --> 00:03:44,200 comes up. 67 00:03:44,290 --> 00:03:45,810 Go search on Google. 68 00:03:45,880 --> 00:03:47,910 I'm telling you all you ever need to use is blog. 69 00:03:48,130 --> 00:03:48,850 OK. 70 00:03:49,210 --> 00:03:50,640 So true or false. 71 00:03:50,770 --> 00:03:52,450 And how can you use these things well 72 00:03:56,440 --> 00:03:57,520 to make decisions for you. 73 00:03:57,520 --> 00:04:02,280 So that's it that's pulling ins. 74 00:04:02,770 --> 00:04:03,910 Let's put them in action. 75 00:04:03,910 --> 00:04:08,850 Let's actually see how we can use comparisons with. 76 00:04:09,190 --> 00:04:10,960 Well I can say one more thing actually. 77 00:04:11,380 --> 00:04:12,270 Just one more thing. 78 00:04:12,370 --> 00:04:13,170 OK. 79 00:04:13,510 --> 00:04:15,780 Just to blow your mind and confuse you completely. 80 00:04:16,090 --> 00:04:23,580 If true equals false or if true equals true. 81 00:04:24,620 --> 00:04:30,410 Print WITF this is what the fish. 82 00:04:30,430 --> 00:04:31,370 By the way. 83 00:04:31,750 --> 00:04:33,620 All right. 84 00:04:34,000 --> 00:04:35,640 What's going on here. 85 00:04:35,650 --> 00:04:39,610 So we're using the double equals sign here. 86 00:04:39,610 --> 00:04:43,240 This is a comparison operator and this is called equal to. 87 00:04:43,300 --> 00:04:47,220 So if true is equal to false. 88 00:04:47,230 --> 00:04:52,940 Ok if true is equal to false then this whole side of the equation would be true but it's not. 89 00:04:52,940 --> 00:04:57,490 So this whole side of the equation is false so we're saying if false or. 90 00:04:57,630 --> 00:05:06,220 OK this is the or operator OK and or if true equals true. 91 00:05:06,370 --> 00:05:10,400 So if this is true or if this is true then go into here. 92 00:05:10,900 --> 00:05:13,210 OK so true is definitely equal to true. 93 00:05:13,210 --> 00:05:16,450 So this is going to return the entire section over here to true. 94 00:05:16,780 --> 00:05:24,550 And so again you can start to see maybe how you can start comparing things in your code. 95 00:05:24,730 --> 00:05:31,120 And this is a great example because you probably wouldn't write this in your code but a lot of coding 96 00:05:31,120 --> 00:05:36,550 tests and brainteasers out there will actually ask you to decipher things like this. 97 00:05:36,550 --> 00:05:40,350 So you're you can they can see how your brain works and see if you can read the code. 98 00:05:40,360 --> 00:05:42,430 This is really good for learning how to read code. 99 00:05:42,580 --> 00:05:43,010 OK. 100 00:05:43,090 --> 00:05:45,070 So true or false. 101 00:05:45,400 --> 00:05:52,960 You know a better example is for instance var has data finished downloading you know how when you get 102 00:05:52,960 --> 00:05:57,810 an app and there's a spinner bar always explicitly declare it. 103 00:05:58,090 --> 00:05:59,560 So you can know it's a boolean. 104 00:05:59,560 --> 00:06:04,060 So basically when you get that spinner bar it's hitting up a server and it's downloading data. 105 00:06:04,120 --> 00:06:04,810 OK. 106 00:06:04,810 --> 00:06:10,080 So you know we've got the spinner and dot dot dot you know a little color that was nice. 107 00:06:10,090 --> 00:06:12,050 Got it. 108 00:06:12,610 --> 00:06:14,180 That's funny. 109 00:06:14,180 --> 00:06:14,880 Let's just pick a car. 110 00:06:14,880 --> 00:06:17,240 I don't know what it's doing to be honest but I like it. 111 00:06:17,260 --> 00:06:23,400 It's yellow it's a feature of a feature of the playgrounds anyway so we're Delanie data from the internet. 112 00:06:23,400 --> 00:06:29,010 Then after it's done downloading we can say has data finished downloading equals true. 113 00:06:29,210 --> 00:06:29,710 All right. 114 00:06:29,820 --> 00:06:35,580 And then we can do something like no load UI and other features. 115 00:06:35,910 --> 00:06:42,330 So this is an example of when you actually use a ball in your code and in your projects with for things 116 00:06:42,330 --> 00:06:48,100 like this and I've done things like this before it's nothing wrong with it it's a common thing to do. 117 00:06:48,120 --> 00:06:48,780 So it's boolean. 118 00:06:48,780 --> 00:06:49,880 True or false. 119 00:06:49,880 --> 00:06:56,520 It's one way you can use it again anytime anytime you need to get a true false yes or no Bullen's the 120 00:06:56,520 --> 00:07:04,230 way to go ball for short the bulls go hand in hand or boolean logic goes hand in hand with comparison 121 00:07:04,230 --> 00:07:08,970 operators can comparison operators will return a boolean. 122 00:07:09,110 --> 00:07:10,450 Hmm OK. 123 00:07:10,500 --> 00:07:15,180 When I say baleen it is Boole but bullying is the long term for it. 124 00:07:15,410 --> 00:07:30,320 With just condense it here so for instance this is real easy if one is equal to two print should not 125 00:07:30,360 --> 00:07:31,800 see this. 126 00:07:31,900 --> 00:07:36,580 OK so will never be executed. 127 00:07:36,600 --> 00:07:37,580 Thank you. 128 00:07:37,580 --> 00:07:38,460 It's smart. 129 00:07:38,460 --> 00:07:42,240 So if one equals two well one is not equal to two when the recall. 130 00:07:42,240 --> 00:07:44,280 So again this returns a boolean. 131 00:07:44,570 --> 00:07:45,080 OK. 132 00:07:45,300 --> 00:07:46,530 That's really interesting huh. 133 00:07:46,860 --> 00:07:49,110 I wonder do you think you could do something like that over here. 134 00:07:49,110 --> 00:07:52,440 Actually in in a in a boolean self. 135 00:07:52,440 --> 00:07:59,520 So what if we said instead of saying false we'll say Well said This has data finished downloading equals 136 00:07:59,610 --> 00:08:00,960 one equals to 137 00:08:03,730 --> 00:08:05,230 and resting. 138 00:08:05,640 --> 00:08:09,730 So like I said this is returning a boolean a true or false value that's been stored in here. 139 00:08:09,750 --> 00:08:16,020 So like I was telling me earlier you use them less here in variables and you use them more in conditional 140 00:08:16,020 --> 00:08:23,860 logic they return them only return a boolean for the sake of performing making a decision. 141 00:08:24,110 --> 00:08:24,380 OK. 142 00:08:24,390 --> 00:08:30,200 So if one equals to print you should not see this if two equals two. 143 00:08:30,210 --> 00:08:31,040 Now we're seeing it. 144 00:08:31,130 --> 00:08:31,720 OK. 145 00:08:32,050 --> 00:08:38,770 So it returns a false value conditional conditional logic. 146 00:08:38,770 --> 00:08:40,800 OK so let's talk about the different operators here. 147 00:08:40,930 --> 00:08:41,490 All right. 148 00:08:41,740 --> 00:08:46,690 So we've got equal to and it's the double equal sign OK. 149 00:08:47,110 --> 00:08:56,640 We've got not equal to which is the exclamation point and the equal sign not equal to. 150 00:08:56,650 --> 00:09:00,210 All right we've got greater than. 151 00:09:00,640 --> 00:09:02,210 And this is you know a. 152 00:09:02,340 --> 00:09:03,820 It's greater than B. 153 00:09:04,440 --> 00:09:07,130 So I say that's greater then. 154 00:09:07,130 --> 00:09:08,220 And I forgot my colon. 155 00:09:08,330 --> 00:09:09,560 It isn't. 156 00:09:10,240 --> 00:09:12,350 And then we've got greater. 157 00:09:12,880 --> 00:09:22,720 Greater than or equal to which is you know the big Pacman mouth to the left equal to and then we have 158 00:09:24,100 --> 00:09:26,620 less than or equal to 159 00:09:29,610 --> 00:09:30,510 like so. 160 00:09:31,110 --> 00:09:34,780 And then we've got less than two. 161 00:09:35,000 --> 00:09:35,310 OK. 162 00:09:35,400 --> 00:09:37,810 So obviously there's a lot going on here. 163 00:09:38,220 --> 00:09:39,700 But let's see how it actually works. 164 00:09:39,710 --> 00:09:40,610 Let's see it in action. 165 00:09:40,610 --> 00:09:41,190 OK. 166 00:09:41,440 --> 00:09:48,390 So of course the common example here that we've used already is a bank account so we can obviously do 167 00:09:48,390 --> 00:09:49,080 that here again. 168 00:09:49,080 --> 00:09:58,080 So our bank balance right equals are equals five $400 K our item to buy. 169 00:09:58,380 --> 00:10:00,120 Equals $100. 170 00:10:00,320 --> 00:10:01,050 OK. 171 00:10:01,300 --> 00:10:09,870 So then what we can do is we can say if bank balance bank balance is greater than or equal to item to 172 00:10:09,870 --> 00:10:15,470 buy Why wouldn't we just say if it's greater then well the ire of the buyer was $400. 173 00:10:15,510 --> 00:10:17,730 This would turn out to be false and we would be able to buy it. 174 00:10:17,730 --> 00:10:18,550 That's not right. 175 00:10:18,570 --> 00:10:23,610 We need to be able to go to zero dollars in our account but not into the negative unless you turn unless 176 00:10:23,610 --> 00:10:26,430 you put an overdraft protection you know which. 177 00:10:26,460 --> 00:10:27,810 Why did people do that. 178 00:10:27,810 --> 00:10:29,000 No frigging clue. 179 00:10:29,010 --> 00:10:29,960 Just what I wanted to do. 180 00:10:29,960 --> 00:10:36,740 I wanted to spend money I didn't have get the item and then have you charge me a negative fee. 181 00:10:36,810 --> 00:10:40,440 I mean I guess if you want to be embarrassed at the register because your card didn't go through and 182 00:10:40,440 --> 00:10:43,720 you're like I'm sorry sir your card didn't go through Was everything OK. 183 00:10:43,740 --> 00:10:46,480 Do you need any help with your family. 184 00:10:46,560 --> 00:10:47,260 No. 185 00:10:47,340 --> 00:10:53,220 So anyway my point is we need the equal to sign so we can actually buy the item the item to buy. 186 00:10:53,950 --> 00:10:54,400 OK. 187 00:10:54,600 --> 00:10:57,490 Then print purchased item. 188 00:10:57,670 --> 00:10:58,300 OK. 189 00:10:58,470 --> 00:11:05,100 So if you've got more money or equal to or an equal amount of money then by print purchase item. 190 00:11:05,210 --> 00:11:15,880 Another thing we could do you know we could say if item to buy is greater than the bank balance 191 00:11:19,050 --> 00:11:23,620 you need more money to. 192 00:11:24,660 --> 00:11:25,080 So 193 00:11:28,300 --> 00:11:32,710 if Ireland buy is great the balance you need more money for this and we're using a greater than only 194 00:11:32,720 --> 00:11:37,090 sign so let's say the item to buy is now five hundred dollars. 195 00:11:37,720 --> 00:11:39,380 Sure enough it prints out right here. 196 00:11:39,640 --> 00:11:40,360 OK this is cool. 197 00:11:40,370 --> 00:11:43,120 So so far we've used greater than or equal to. 198 00:11:43,210 --> 00:11:47,430 We've also used the greater than sign here. 199 00:11:47,660 --> 00:11:48,520 OK. 200 00:11:48,640 --> 00:11:58,390 And maybe maybe your bank whenever you whenever you hit zero for instance it wants to give you a notification 201 00:11:58,390 --> 00:12:00,760 saying hey you're in no money. 202 00:12:00,790 --> 00:12:01,520 You spend it all. 203 00:12:01,520 --> 00:12:08,800 You know so you know this is a silly example but we can say if item to buy is equal to bank balance. 204 00:12:09,000 --> 00:12:10,090 OK. 205 00:12:10,240 --> 00:12:19,540 And then what we can do is we can say print Hey buddy your balance is now zero. 206 00:12:20,190 --> 00:12:21,040 OK. 207 00:12:21,160 --> 00:12:24,130 So I'd advise the bank balance Hey buddy your balance is now zero. 208 00:12:24,130 --> 00:12:28,510 So if I say I'm the buy is $400. 209 00:12:29,280 --> 00:12:30,670 Hey buddy your balance is now zero. 210 00:12:30,670 --> 00:12:35,680 So if this is equal to this OK then do this. 211 00:12:35,680 --> 00:12:42,850 Now remember remember these operators here OK are returning a true or false value. 212 00:12:42,850 --> 00:12:43,170 OK. 213 00:12:43,180 --> 00:12:46,250 So remember you could actually store this in a variable. 214 00:12:46,300 --> 00:12:55,800 So for instance var am I at zero equals I want to buy people's bank balance. 215 00:12:55,840 --> 00:12:56,160 OK. 216 00:12:56,170 --> 00:12:58,840 So it's going to run this operation first. 217 00:12:59,410 --> 00:13:02,860 And then what it's going to do is it's going to return a true or false value into this. 218 00:13:02,860 --> 00:13:06,010 And this is a and so you can actually store the result if you want it to. 219 00:13:06,010 --> 00:13:08,770 But again like I said in most cases you don't. 220 00:13:08,830 --> 00:13:09,450 OK. 221 00:13:09,730 --> 00:13:12,890 And then let's see here. 222 00:13:12,970 --> 00:13:20,110 The only other one of great importance is the not equal to sign so I'll show you that as well to friends 223 00:13:20,110 --> 00:13:23,450 and also we want to compare instead of numbers we want to compare strings. 224 00:13:23,470 --> 00:13:34,980 So if let's say correct spelling is not equal to 225 00:13:38,610 --> 00:13:47,080 and let's actually better save our word one equals Let's get this let's say this are book titles case 226 00:13:47,100 --> 00:14:07,550 so book title one equals let's say Harry Potter and the Moffit of Mier on my book. 227 00:14:07,780 --> 00:14:08,020 OK. 228 00:14:08,020 --> 00:14:14,620 Anyway and then we have a book titled two equals unless we have the same thing here but this one's entered 229 00:14:14,620 --> 00:14:15,500 by a user. 230 00:14:15,550 --> 00:14:18,710 OK this one was entered by a user they knew would be the same thing right. 231 00:14:18,940 --> 00:14:24,190 So let's say that the user action in lowercase this and you know if forgot got a you know there's bad 232 00:14:24,190 --> 00:14:38,140 spelling so we can do is we can say if Book Title One is not equal to book title to you know print need 233 00:14:38,140 --> 00:14:42,930 to fix spelling before printing whatever. 234 00:14:43,550 --> 00:14:44,010 OK. 235 00:14:44,320 --> 00:14:48,870 So if this one is not the same as this one then do something else. 236 00:14:48,880 --> 00:14:49,580 OK. 237 00:14:49,820 --> 00:14:53,660 So it's basically the opposite of using these here. 238 00:14:53,770 --> 00:14:54,020 OK. 239 00:14:54,030 --> 00:14:57,030 And you can you'll see programmers use these interchangeably. 240 00:14:57,100 --> 00:15:02,590 And you can kind of sometimes you can do to get the same result in decision using different operators 241 00:15:02,770 --> 00:15:04,970 just depending on what you put first or second. 242 00:15:04,990 --> 00:15:08,150 But you can do whatever one you want which is cool. 243 00:15:08,160 --> 00:15:09,820 So this is all really cool. 244 00:15:09,820 --> 00:15:13,630 This is really cool stuff. 245 00:15:13,630 --> 00:15:19,850 Another thing you can do is remember how we did this example up here has day to finish downloading. 246 00:15:19,910 --> 00:15:28,990 You can also use that unary operators so we could say if our first let's let's do it with stood up here 247 00:15:30,220 --> 00:15:31,700 before it's been set to true. 248 00:15:31,870 --> 00:15:38,100 So if not has data finished downloading. 249 00:15:38,430 --> 00:15:45,560 OK then print loading data. 250 00:15:45,580 --> 00:15:50,800 So at this point in time if the data has not finished downloading let's print to the screen loading 251 00:15:50,800 --> 00:15:51,070 data. 252 00:15:51,070 --> 00:15:56,430 So this is the operator put before the boolean value. 253 00:15:56,440 --> 00:15:57,700 And so it's saying the opposite. 254 00:15:57,700 --> 00:15:57,970 Right. 255 00:15:57,970 --> 00:16:03,730 So that's why it's so important to word your variables with your Bulleen so carefully so has data finish 256 00:16:03,730 --> 00:16:04,290 downloading. 257 00:16:04,300 --> 00:16:05,440 That's the question we're asking. 258 00:16:05,440 --> 00:16:09,610 So if the data has not finished Etling that's what this is saying here. 259 00:16:09,610 --> 00:16:11,330 Print this here OK. 260 00:16:11,650 --> 00:16:13,090 Print loading data. 261 00:16:13,090 --> 00:16:14,380 Pretty cool stuff right. 262 00:16:14,380 --> 00:16:18,070 So what we've done here so far is we've just used some of the basic operators of course we've used the 263 00:16:18,070 --> 00:16:20,840 greater than or equal to you can also use the less than or equal to. 264 00:16:20,920 --> 00:16:26,260 And you can start making decisions based on those operators. 265 00:16:26,290 --> 00:16:26,550 OK. 266 00:16:26,560 --> 00:16:32,640 The result of those operators which is I think pretty dang cool. 267 00:16:32,650 --> 00:16:35,890 One more thing I want to show you and then we'll be done. 268 00:16:35,890 --> 00:16:39,990 So if Book Title 1 is not equal the book title to. 269 00:16:40,550 --> 00:16:44,450 OK then we need to fix spelling before printing great else. 270 00:16:44,560 --> 00:16:45,400 There's the key word. 271 00:16:45,400 --> 00:16:48,940 So if this happens or if this is true great. 272 00:16:48,970 --> 00:16:54,200 If not go to the next block of code and this will always always always be executed. 273 00:16:54,700 --> 00:17:01,930 If this is false and this will never ever ever be executed if this is true it very important to know. 274 00:17:02,340 --> 00:17:13,900 And so that you say print book looks great send to enter pretty corporate book title on non-equal the 275 00:17:13,900 --> 00:17:18,780 book title too great we can do more though like we can also say. 276 00:17:19,390 --> 00:17:24,010 So if so the first thing we want to do is check the spelling then what we want to do is we want to make 277 00:17:24,010 --> 00:17:28,040 sure that the size of the book title is a proper size. 278 00:17:28,300 --> 00:17:28,690 We can say. 279 00:17:28,690 --> 00:17:30,580 Else if ok. 280 00:17:30,820 --> 00:17:33,350 Book Title 1 thought. 281 00:17:33,430 --> 00:17:37,580 See or at length on a string here. 282 00:17:40,970 --> 00:17:41,570 See 283 00:17:53,670 --> 00:17:54,480 and far. 284 00:17:54,710 --> 00:18:05,270 Oh characters has the string and the characters and the goodness so if the count of the entire string 285 00:18:05,270 --> 00:18:15,140 is greater then let's say 10 like the one we need to do is print find a new title for the book. 286 00:18:16,010 --> 00:18:16,770 OK. 287 00:18:17,300 --> 00:18:18,620 So that's interesting. 288 00:18:18,620 --> 00:18:24,630 So look what we did here in the book one title or the book title one is like with a book title to them 289 00:18:24,650 --> 00:18:26,140 we need to send us the printing. 290 00:18:26,450 --> 00:18:27,810 Well let's say that we fixed it. 291 00:18:27,840 --> 00:18:29,690 All right so this is great we've just fixed it. 292 00:18:29,690 --> 00:18:33,960 The book is now perfectly edited whatever. 293 00:18:34,520 --> 00:18:35,440 But look here. 294 00:18:35,480 --> 00:18:37,390 Find a new title for your book is now called. 295 00:18:37,400 --> 00:18:38,000 OK. 296 00:18:38,210 --> 00:18:40,410 So we passed the first one this is true. 297 00:18:40,760 --> 00:18:47,130 So then we go to the next thing or excuse me this is false and therefore it's not called. 298 00:18:47,570 --> 00:18:48,490 This is false. 299 00:18:48,580 --> 00:18:54,310 So else if book titled two characters that count is greater than 10. 300 00:18:54,560 --> 00:18:55,200 Oh no. 301 00:18:55,310 --> 00:18:56,510 We need to find a new title for the book. 302 00:18:56,510 --> 00:18:58,220 This is too long it's not going to fit on the book. 303 00:18:58,450 --> 00:19:04,790 OK so we need a book that has nine characters in order in order to get to here to the else clause so 304 00:19:05,390 --> 00:19:10,960 let's say one two three four five count the space that's a character six seven eight nine. 305 00:19:11,010 --> 00:19:12,350 Oh wow. 306 00:19:12,350 --> 00:19:20,430 So Harry Potter and the muppet of fire was his turn nary below what does book's about anymore. 307 00:19:20,750 --> 00:19:25,440 But the editors thought it might be a little more appropriate to add a G there instead. 308 00:19:25,440 --> 00:19:32,330 So we've got some crazy book that we've released the title on and now look see if we pass it here. 309 00:19:32,330 --> 00:19:37,170 So if book titled to the characters that count is greater than 10. 310 00:19:37,280 --> 00:19:40,280 Print a new title for the book. 311 00:19:40,280 --> 00:19:45,860 And of course we need to copy this over here because it needs to be the same again. 312 00:19:46,250 --> 00:19:49,680 So if book titles are not equal to book title too well it is. 313 00:19:49,680 --> 00:19:53,810 So this is false or am I going to call this LCF book title that characters that count is greater than 314 00:19:53,810 --> 00:19:54,340 10. 315 00:19:54,390 --> 00:19:55,910 We fix that problem too. 316 00:19:56,030 --> 00:19:57,720 So this is going to be false. 317 00:19:57,740 --> 00:20:03,350 So here's the end all catch all so once we pass those conditions it is now true and we're able to print 318 00:20:03,350 --> 00:20:03,970 the book. 319 00:20:04,140 --> 00:20:08,330 OK so we've worked with if statements else if statements else statements. 320 00:20:08,330 --> 00:20:14,550 We've worked with these conditional operators here OK that double equals the greater than the greater 321 00:20:14,550 --> 00:20:15,290 than equal. 322 00:20:15,290 --> 00:20:18,550 We've also talked about less than and less than or equal to. 323 00:20:19,250 --> 00:20:20,910 We know a lot of stuff here. 324 00:20:20,990 --> 00:20:25,530 We've talked about the urinary not OPERATOR OK the prefix here. 325 00:20:25,940 --> 00:20:32,960 If it's not finished downloading we're talking about booleans and true or false and how this will equate 326 00:20:32,960 --> 00:20:34,840 to a true or false. 327 00:20:34,850 --> 00:20:36,710 Some really good stuff so we're going to call this video done. 328 00:20:36,710 --> 00:20:37,640 It's a lot to take in. 329 00:20:37,640 --> 00:20:43,730 Watch it again and you're going to start using conditions in your applications because that's how applications 330 00:20:44,330 --> 00:20:48,810 make decisions is by using tools. 331 00:20:48,930 --> 00:20:52,590 Mark Price does Loeb's dotcom moving on and forward.