1 00:00:02,150 --> 00:00:05,210 Pay everyone Mark Price you're at death's slopes. 2 00:00:05,330 --> 00:00:12,490 And today we're going to learn how to work with loops and you've learned a little bit about a race. 3 00:00:12,560 --> 00:00:18,790 You're going to see how loops and arrays go hand-in-hand together go ahead and create a new playground 4 00:00:19,060 --> 00:00:30,860 file new playground and let's call this loopy loops because it sounds so much fun. 5 00:00:30,860 --> 00:00:33,050 Am I saying it right here. 6 00:00:33,110 --> 00:00:33,930 Perfect. 7 00:00:37,540 --> 00:00:38,400 OK. 8 00:00:38,980 --> 00:00:43,330 So in order to appreciate and understand the let's talk about some of the problems that we run into 9 00:00:43,330 --> 00:00:45,300 when we don't use loops. 10 00:00:45,520 --> 00:00:46,330 OK. 11 00:00:46,330 --> 00:00:50,930 And we've kind of used this before this scenario in working with arrays. 12 00:00:50,930 --> 00:00:52,250 So let's do the same thing now. 13 00:00:52,270 --> 00:00:59,790 So we've got employees or rather we've got employees who have salaries bar employee one salary. 14 00:00:59,830 --> 00:01:00,360 Right. 15 00:01:00,380 --> 00:01:03,980 So we've got four employees employees each with their own salary. 16 00:01:04,150 --> 00:01:13,900 Forty five thousand dollars for employee 1 bar employee 2 salary equals one hundred thousand dollars. 17 00:01:13,900 --> 00:01:26,770 Our employee three salary equals fifty four thousand dollars and bar employee for salary equals $20000. 18 00:01:27,450 --> 00:01:29,400 OK so we've got four different employees here. 19 00:01:29,420 --> 00:01:34,940 All right now let's say that we had a really good year at the company. 20 00:01:34,960 --> 00:01:35,310 OK. 21 00:01:35,320 --> 00:01:37,630 And we want to give every employee a raise. 22 00:01:37,890 --> 00:01:39,060 So we need to do that. 23 00:01:39,060 --> 00:01:42,990 You know we were a big company we need to make sure that we can automate some things here. 24 00:01:43,000 --> 00:01:48,570 So we're writing an app that allows us to give instant salary increases to employees. 25 00:01:48,610 --> 00:01:50,000 So how do we do that. 26 00:01:52,060 --> 00:01:56,820 Let's say also that we need to give them a certain percentage of a salary raise. 27 00:01:56,830 --> 00:01:57,880 So listen to that as well too. 28 00:01:57,890 --> 00:02:00,010 So say employee one salary 29 00:02:08,060 --> 00:02:17,410 employee one salary equals employee one salary plus employee one salary is 0.1 zero. 30 00:02:17,640 --> 00:02:20,890 OK so we're doing some basic high school math here. 31 00:02:20,900 --> 00:02:27,260 We're taking the salary of the first employee multiplying it by decimal point 10 which is 10 percent. 32 00:02:27,260 --> 00:02:31,520 So we're going to find out what 10 percent of their existing salary is and then we're going to add it 33 00:02:31,520 --> 00:02:36,130 back onto the salary here and store it into employee one salary that's all that's happening. 34 00:02:36,130 --> 00:02:39,140 We're giving this person a 10 percent increase in their salary. 35 00:02:39,140 --> 00:02:40,830 And they're very happy about that. 36 00:02:40,940 --> 00:02:42,020 Don't want any bugs in this app. 37 00:02:42,050 --> 00:02:42,960 That's for sure. 38 00:02:43,250 --> 00:02:45,180 Especially if it's for your own salary. 39 00:02:45,180 --> 00:02:51,950 All right so employee to salary his employee salary plus employees DOLLERY times zero point one zero. 40 00:02:51,950 --> 00:02:53,410 You're probably thinking to yourself. 41 00:02:53,480 --> 00:02:54,640 All right I get the point Mark. 42 00:02:54,650 --> 00:02:56,930 You don't have to keep writing all this code as is a drag. 43 00:02:56,930 --> 00:03:03,740 Well I mean write it down anyway because you need to really appreciate the pain of doing this kind of 44 00:03:03,740 --> 00:03:07,860 stuff because if you're doing this kind of stuff in your code you're doing it wrong. 45 00:03:07,880 --> 00:03:11,130 There's definitely a better way to code. 46 00:03:11,750 --> 00:03:14,930 This is called code smell when you're like something it doesn't seem right about this. 47 00:03:14,930 --> 00:03:20,650 Well we're also breaking the dry principle here too. 48 00:03:20,900 --> 00:03:22,990 Don't repeat yourself. 49 00:03:23,060 --> 00:03:23,930 All right. 50 00:03:24,320 --> 00:03:28,210 So you've just given every employee here a 10 percent raise right. 51 00:03:28,220 --> 00:03:29,110 That's great. 52 00:03:29,130 --> 00:03:34,130 Now the problem comes in especially when we have like 50 employees or a hundred employees or are you 53 00:03:34,130 --> 00:03:36,200 going to write an app that stores all this. 54 00:03:36,200 --> 00:03:39,140 Also what if we hire new employees or fire employees. 55 00:03:39,140 --> 00:03:40,940 How do we know how many employees are. 56 00:03:40,930 --> 00:03:45,570 Every time we get a new employee We're going to have to change our code to add the employees in here. 57 00:03:45,590 --> 00:03:47,660 This is not a great way to do things. 58 00:03:47,690 --> 00:03:48,690 Not at all. 59 00:03:49,040 --> 00:03:50,450 Not at all. 60 00:03:50,480 --> 00:03:55,010 And also it's not a good idea to keep these off separately like this as well too. 61 00:03:55,010 --> 00:03:56,070 So this is bad. 62 00:03:56,130 --> 00:03:58,120 Ok this is the bad way. 63 00:03:58,220 --> 00:03:59,380 Bad way. 64 00:03:59,750 --> 00:04:01,310 All right let's clean some things up. 65 00:04:01,340 --> 00:04:07,820 You know it's but these employees salaries and rates of our salaries equals and then we can just do 66 00:04:07,820 --> 00:04:12,030 some copying and pasting here so paste you know this is an array. 67 00:04:12,060 --> 00:04:13,220 I've talked about this before. 68 00:04:13,220 --> 00:04:21,440 Command c command B and C is copying and pasting here. 69 00:04:22,430 --> 00:04:27,520 So there's our array of salary's so Elissa's is better. 70 00:04:27,530 --> 00:04:32,680 This is mo better putting it in an array. 71 00:04:32,900 --> 00:04:40,160 Ok but how would we go through these and add 10 percent each person's salary. 72 00:04:40,160 --> 00:04:46,230 Well it would look something like this would be salary's zero. 73 00:04:46,970 --> 00:04:50,620 Equals insane salaries zero. 74 00:04:50,740 --> 00:05:00,700 Grabbing the first salary out of here plus salaries zero times zero point one zero. 75 00:05:01,010 --> 00:05:13,250 And then same thing as salaries one equals salaries one plus salaries one times 0.0 etc. etc. for the 76 00:05:13,250 --> 00:05:14,260 other two. 77 00:05:14,270 --> 00:05:14,900 OK. 78 00:05:14,900 --> 00:05:19,280 So is this any better than this. 79 00:05:19,280 --> 00:05:20,100 Not really. 80 00:05:20,120 --> 00:05:21,620 We're still writing lots of code. 81 00:05:21,740 --> 00:05:25,150 So this is definitely better putting in an array versus four different variables. 82 00:05:25,160 --> 00:05:26,640 But this is no good. 83 00:05:26,660 --> 00:05:29,120 This is a lot of manual work and again we don't know. 84 00:05:29,240 --> 00:05:32,420 You know I'm putting numbers in here but we don't know how many employees are actually in the lists. 85 00:05:32,480 --> 00:05:36,050 You know it's going to come into the app and we wouldn't know unless we count them on and changed our 86 00:05:36,050 --> 00:05:41,510 code which is you don't do that nobody rewrites code and does all this stuff manually based on some 87 00:05:41,510 --> 00:05:42,970 condition in the real world. 88 00:05:42,980 --> 00:05:44,560 So how do we solve this problem. 89 00:05:44,660 --> 00:05:46,470 Well we can solve this problem. 90 00:05:46,670 --> 00:05:52,580 That's making our life so miserable right now by using a loop and let's create our very first loop. 91 00:05:52,760 --> 00:05:55,490 We're going to do a a while loop. 92 00:05:55,640 --> 00:05:56,390 OK. 93 00:05:56,660 --> 00:05:58,660 So we're going to say var X equals zero. 94 00:05:58,670 --> 00:06:08,450 This is going to be an index and then we're going to say repeat while X is less than salary's does count 95 00:06:13,190 --> 00:06:17,840 more in say X plus equals one OK. 96 00:06:18,310 --> 00:06:21,450 So what is going on here. 97 00:06:21,790 --> 00:06:25,600 Well look over here on the right it says it ran this loop four times. 98 00:06:25,600 --> 00:06:26,870 So here's the syntax. 99 00:06:26,890 --> 00:06:27,770 The keyword is. 100 00:06:27,820 --> 00:06:28,700 Repeat. 101 00:06:28,870 --> 00:06:29,630 OK. 102 00:06:29,830 --> 00:06:30,540 Repeat. 103 00:06:30,640 --> 00:06:38,780 And then a opening bracket and closing bracket inside we're incrementing X by 1. 104 00:06:38,800 --> 00:06:40,320 It's a variable of type and. 105 00:06:40,600 --> 00:06:48,640 And then while X is less than salary's that count so every loop in programming will repeat itself until 106 00:06:48,640 --> 00:06:50,380 some condition is met. 107 00:06:50,390 --> 00:06:51,670 OK that's what you need to remember. 108 00:06:51,670 --> 00:06:52,060 It doesn't. 109 00:06:52,060 --> 00:06:59,120 Don't think of the syntax or different types of loops loops will repeat until some condition is met. 110 00:06:59,290 --> 00:07:06,040 And in this case here in the parentheses while X is less then salaries that count let's say how many 111 00:07:06,040 --> 00:07:07,590 items are in salaries. 112 00:07:07,600 --> 00:07:10,450 One two three four. 113 00:07:10,450 --> 00:07:14,340 So while X is less than 4 Well it starts at zero. 114 00:07:14,350 --> 00:07:19,480 So this is what's going to happen this loops going to be run once for sure no matter what. 115 00:07:19,480 --> 00:07:23,790 And X is now equal to 1 x plus equals one. 116 00:07:24,120 --> 00:07:24,750 OK. 117 00:07:24,760 --> 00:07:28,630 And then it says while X is less than Sollars accounts while one is less than Sollars that count. 118 00:07:28,660 --> 00:07:29,140 OK. 119 00:07:29,260 --> 00:07:34,480 It is still less than salary's that counts so it's going to go through again from top to bottom over 120 00:07:34,480 --> 00:07:40,240 and over and over again until X is now equal to 4 as well as some point. 121 00:07:40,240 --> 00:07:45,960 This will increase X to 4 and then this will no longer be true because four is not less than salary's 122 00:07:45,980 --> 00:07:48,070 that count four is not less than four is it. 123 00:07:48,070 --> 00:07:50,520 No 4 is equal to four. 124 00:07:50,760 --> 00:07:51,240 OK. 125 00:07:51,370 --> 00:07:52,260 So there's a difference here. 126 00:07:52,260 --> 00:07:56,240 If I was to say less than or equal to it would run five times. 127 00:07:56,260 --> 00:07:58,000 But we don't want it to run five times. 128 00:07:58,160 --> 00:07:58,760 OK. 129 00:07:59,080 --> 00:08:03,830 Because that would crash our our application for accessing elements out of this array. 130 00:08:04,120 --> 00:08:08,160 So how do we use this loop to solve our problem. 131 00:08:08,950 --> 00:08:13,680 Well let me tell you there Bob we first crash X code. 132 00:08:13,980 --> 00:08:15,350 That's the right thing to do. 133 00:08:17,620 --> 00:08:21,720 Let's open up ex-coach again are you ready. 134 00:08:22,030 --> 00:08:22,960 So here goes. 135 00:08:22,960 --> 00:08:35,360 Salary's X equal salaries X plus salaries X times zero point 1 0. 136 00:08:36,290 --> 00:08:38,820 OK well this is interesting. 137 00:08:39,130 --> 00:08:40,030 What's going on here Mark. 138 00:08:40,030 --> 00:08:42,370 Why are you putting an X inside of an array that doesn't make any sense. 139 00:08:42,370 --> 00:08:43,870 I thought a raise couldn't take strings. 140 00:08:43,880 --> 00:08:45,310 Well it's not a string right. 141 00:08:45,370 --> 00:08:46,860 It's an INT. 142 00:08:47,060 --> 00:08:52,140 And this is also when you access elements out of your array using it. 143 00:08:52,150 --> 00:08:54,120 OK you put in the subscript here. 144 00:08:54,250 --> 00:08:56,400 We want the first element or the second element. 145 00:08:56,470 --> 00:09:00,830 So the same things happening here we have a variable that represents our index. 146 00:09:00,850 --> 00:09:07,120 So what we could also have done is called this index that makes more sense to. 147 00:09:07,150 --> 00:09:08,750 And then what you can do. 148 00:09:08,740 --> 00:09:12,050 You can just pass the index here and say that it's not that though. 149 00:09:14,570 --> 00:09:18,230 And then right here and right here. 150 00:09:18,390 --> 00:09:20,960 So a little more wordy but it makes more sense now. 151 00:09:21,060 --> 00:09:24,420 So we have an index where passing in the index and that's giving us the element. 152 00:09:24,420 --> 00:09:27,080 So it's going to repeat and grow items out of that. 153 00:09:27,090 --> 00:09:33,310 So let's look at this again salary's index Well if it's the first 10 through indexes equal to zero sorgen 154 00:09:33,310 --> 00:09:34,950 to grab 45000. 155 00:09:35,040 --> 00:09:40,020 So we're seeing this slide here is equal to salary's index. 156 00:09:40,080 --> 00:09:46,780 So it's equal to 45000 plus 45000 times point 1 0. 157 00:09:46,940 --> 00:09:47,470 Okay. 158 00:09:47,520 --> 00:09:49,150 So we're going to take that. 159 00:09:49,550 --> 00:09:54,540 The amount here that 10 percent we're going to add on to 45000 and then we're going to store the result 160 00:09:54,570 --> 00:09:57,400 of this operation here now OK. 161 00:09:57,690 --> 00:10:05,290 And we're going to pass it or as a sign it here into our salaries index into the same spot that we wanted 162 00:10:05,300 --> 00:10:05,760 to. 163 00:10:06,030 --> 00:10:08,140 And so this is cool. 164 00:10:08,160 --> 00:10:14,690 So yeah we've got 1 2 3 4 5 lines of code here versus potentially. 165 00:10:14,940 --> 00:10:17,190 Well let's look at this here. 166 00:10:17,400 --> 00:10:22,230 If we want to do the same thing over here we would have 1 2 3 4 lines of code and 5 year like haha. 167 00:10:22,260 --> 00:10:25,740 Mark it's not any less code it's the same amount of code that we wrote before. 168 00:10:26,040 --> 00:10:30,270 Well what happens if your company has a lot of employees so 169 00:10:33,560 --> 00:10:37,970 what has this many employees there's 28 employees. 170 00:10:37,970 --> 00:10:44,900 Now if I wanted to do this down here I'd have like 20 lines of code that's no good. 171 00:10:44,900 --> 00:10:50,060 Plus this whereas this will always stay a 5 even if I had a million employees. 172 00:10:50,120 --> 00:10:52,010 So we're starting to make really good progress here again. 173 00:10:52,020 --> 00:11:00,320 So aloo all the loops going to do is go over and over and over and over again until some condition is 174 00:11:00,320 --> 00:11:00,970 met. 175 00:11:01,040 --> 00:11:04,840 In this case well index is less than salary's account. 176 00:11:04,970 --> 00:11:05,530 Okay. 177 00:11:05,750 --> 00:11:12,920 If I didn't have this line of code here do you know what we what we would have running here we would 178 00:11:12,920 --> 00:11:14,120 have an infinite loop. 179 00:11:14,120 --> 00:11:16,000 This will eventually crash the program. 180 00:11:16,220 --> 00:11:19,150 Luckily the playground smart enough to stop it for us. 181 00:11:19,280 --> 00:11:22,670 But if you did something like that in your app you would get an infinite loop. 182 00:11:22,670 --> 00:11:26,830 Your app would to run out of memory and it would crash and the user would give you a one star review. 183 00:11:26,840 --> 00:11:28,960 This developer does not know how to make apps. 184 00:11:29,060 --> 00:11:32,270 So you always have to have a way to get out of a loop. 185 00:11:32,510 --> 00:11:34,740 And it's by meeting the condition. 186 00:11:34,880 --> 00:11:37,900 And so that's why we're increasing the index by 1 each time. 187 00:11:37,910 --> 00:11:40,260 So eventually we can meet the condition. 188 00:11:40,310 --> 00:11:42,890 So that's how loops and arrays go hand-in-hand. 189 00:11:42,890 --> 00:11:47,560 You have a set of data and you can iterate through the data with a loop. 190 00:11:47,810 --> 00:11:49,420 Does that make sense. 191 00:11:49,610 --> 00:11:55,190 Is anyone confused because if you are what I want to do is posit video you can watch this portion again 192 00:11:55,610 --> 00:12:01,460 or you can go online and do some research on how to loops work in programming and making some more under 193 00:12:01,460 --> 00:12:02,810 the hood. 194 00:12:03,440 --> 00:12:06,610 Computer science aspects and theory about it. 195 00:12:06,750 --> 00:12:07,000 OK. 196 00:12:07,010 --> 00:12:10,310 So this is a repeat while now you're not going to use a whole lot. 197 00:12:10,310 --> 00:12:15,080 I wanted to show you the repeat while loop because it's very wordy and it makes sense when you look 198 00:12:15,080 --> 00:12:20,540 at it the loop that you're probably going to use more so is a for loop. 199 00:12:20,870 --> 00:12:22,780 Let's do that next. 200 00:12:23,710 --> 00:12:24,760 Let's bring it down here. 201 00:12:24,800 --> 00:12:25,210 OK. 202 00:12:25,340 --> 00:12:29,050 So we're in right the exact same code with even less lines of code which is cool. 203 00:12:29,060 --> 00:12:40,310 So for X or let's say I to represent index in zero dot dot less than salary's dot count and then what 204 00:12:40,310 --> 00:12:45,800 we'll do is we'll just copy this one line of code here and paste it here. 205 00:12:45,800 --> 00:12:48,980 So now we're doing the exact same thing. 206 00:12:49,040 --> 00:12:50,260 This should be in the index 207 00:12:54,190 --> 00:12:58,240 we're doing the exact same thing here and three lines of code that we didn't have five lines of code 208 00:12:58,240 --> 00:12:58,900 so it's smaller. 209 00:12:58,900 --> 00:13:00,570 So let's talk about what's happening. 210 00:13:00,970 --> 00:13:09,020 So for meaning given or for each k is a this is called for in loop. 211 00:13:09,100 --> 00:13:11,030 As you can see the 4 in the end. 212 00:13:11,590 --> 00:13:18,360 So for i in 0 dot dot less than Sollars accounts what we're doing here is we're specifying a range. 213 00:13:18,520 --> 00:13:24,660 OK we're saying start at zero and go all the way to salary's that count which is currently 28. 214 00:13:24,820 --> 00:13:29,440 But we need to be minus one because arrays start at zero which is why we use the less than sign. 215 00:13:29,470 --> 00:13:33,440 So Dot Dot less than you know so we don't put a space before this or a space after. 216 00:13:33,570 --> 00:13:34,130 OK. 217 00:13:34,300 --> 00:13:42,550 So between 0 and salary's that counts between 0 and 27 and then we go through and we run this and it's 218 00:13:42,550 --> 00:13:44,580 going to do the exact same thing as this. 219 00:13:44,590 --> 00:13:50,620 OK and if you're confused at all I mean just do we write this up in even simpler terms so for let's 220 00:13:50,620 --> 00:13:59,670 say X in one dot dot dot five that's just print index. 221 00:13:59,870 --> 00:14:02,860 So we're going to say is equal to the x 222 00:14:06,640 --> 00:14:07,370 K 5 times. 223 00:14:07,400 --> 00:14:13,700 Here as you can see it printed out five times for X in one through five. 224 00:14:13,700 --> 00:14:15,770 So what has happened here. 225 00:14:16,010 --> 00:14:17,310 It's inclusive. 226 00:14:17,360 --> 00:14:17,750 OK. 227 00:14:17,750 --> 00:14:21,410 So it include the one and it included the five and everything in between. 228 00:14:21,410 --> 00:14:24,600 So this is a range you can call it a sequence you can color range. 229 00:14:24,620 --> 00:14:27,910 So it's a sequence of numbers or range and that's the condition. 230 00:14:27,920 --> 00:14:35,450 So for for every You're going to run this loop for every item in this range between 1 and 5 or including 231 00:14:35,450 --> 00:14:37,200 one in five inclusive. 232 00:14:37,340 --> 00:14:38,570 Same thing here. 233 00:14:38,590 --> 00:14:39,520 OK. 234 00:14:39,800 --> 00:14:45,500 Between 0 and salaries that count are less than Zeller's account so that means 27. 235 00:14:45,670 --> 00:14:46,100 OK. 236 00:14:46,250 --> 00:14:51,130 So this one is inclusive This one's exclusive of the number that you put here. 237 00:14:51,260 --> 00:14:51,490 OK. 238 00:14:51,500 --> 00:15:01,980 So in this case here is do the same thing over here again for z in one thought less than five percent. 239 00:15:02,260 --> 00:15:04,930 And next the. 240 00:15:05,630 --> 00:15:09,360 And then we'll go ahead and put Z in here. 241 00:15:10,400 --> 00:15:10,650 OK. 242 00:15:10,670 --> 00:15:13,620 So in this case it only ran one two three four. 243 00:15:13,850 --> 00:15:18,000 So this was Xclusive it did not include the five because we had the less than sign there. 244 00:15:18,020 --> 00:15:18,690 OK. 245 00:15:19,010 --> 00:15:24,980 And what's happening is every time he goes through this loop it passes that value of this range here. 246 00:15:25,040 --> 00:15:30,750 The current iteration of that range it passes it here into this constant this number cannot be changed. 247 00:15:30,890 --> 00:15:33,920 It passes it in here so you can use it for whatever you want. 248 00:15:33,920 --> 00:15:38,560 In our case here we're using it each time to access the element in the array. 249 00:15:38,570 --> 00:15:44,120 So in this case it's going to run this code 28 times between 0 and 27. 250 00:15:44,300 --> 00:15:48,400 It's going to pass that number into every single time 0 1 2 3 4 or 5. 251 00:15:48,440 --> 00:15:54,230 And then you can use those numbers on your array elements which is pretty cool which is why we do salary's 252 00:15:54,230 --> 00:15:54,760 don't count. 253 00:15:54,760 --> 00:15:59,510 We get the total length of the array as our maximum number and then we run through it. 254 00:15:59,510 --> 00:16:03,410 So we know it's going to stop once it gets us where we need to be. 255 00:16:03,470 --> 00:16:06,260 So we don't have to do this kind of junk anymore. 256 00:16:06,320 --> 00:16:08,170 We don't have to do this kind of junk anymore. 257 00:16:08,450 --> 00:16:14,210 You're going to have an array of salaries and then you can run loops to get information out of the sellers 258 00:16:14,240 --> 00:16:17,050 or out of that array which is pretty cool. 259 00:16:17,060 --> 00:16:20,490 Now loops can take a long time to understand if this is really confusing for you. 260 00:16:20,500 --> 00:16:21,470 It's OK. 261 00:16:21,560 --> 00:16:23,620 This is it's normal to be confused. 262 00:16:23,930 --> 00:16:28,730 All you need to know as a beginner is how to use these tools because as you get better at them you're 263 00:16:28,730 --> 00:16:32,480 going to get you're going to understand what's going on under the hood and how these things work. 264 00:16:32,480 --> 00:16:39,290 OK so what we've done here is we've created a while loop and we've created three four inch loops. 265 00:16:39,310 --> 00:16:44,130 There is one more loop I want to talk about and it's a For Each loop. 266 00:16:44,160 --> 00:16:44,990 OK. 267 00:16:45,650 --> 00:16:50,350 And it's technically a four in loop but I'll show you why it might make sense to Word. 268 00:16:50,360 --> 00:17:00,240 As for each so for salary and salaries they print salary. 269 00:17:00,650 --> 00:17:04,080 So let's say you want to create something that goes for all the salaries and prints them up. 270 00:17:04,250 --> 00:17:05,740 OK. 271 00:17:06,680 --> 00:17:10,750 So what we're doing here is very similar to this for in loop. 272 00:17:11,030 --> 00:17:12,730 But there's no range. 273 00:17:12,890 --> 00:17:13,300 OK. 274 00:17:13,290 --> 00:17:15,950 So what we're doing here is we're saying for each. 275 00:17:16,200 --> 00:17:19,990 Visualize this in your mind for each item in this array. 276 00:17:20,050 --> 00:17:20,570 Run a loops. 277 00:17:20,570 --> 00:17:23,490 That's the condition for every item that's in this array. 278 00:17:23,510 --> 00:17:24,460 Run this loop. 279 00:17:24,470 --> 00:17:29,700 So in our case here for every salary that is inside the salaries array. 280 00:17:30,170 --> 00:17:37,430 OK print salary so what it does is it skips some things for you if it takes off this heavy lifting for 281 00:17:37,430 --> 00:17:37,680 you. 282 00:17:37,700 --> 00:17:39,990 Grabbing the index it says don't worry about that. 283 00:17:40,010 --> 00:17:40,700 We'll do that for you. 284 00:17:40,700 --> 00:17:47,030 So it grabs the item out of the array for you automatically and sticks it here in it'll Konst it. 285 00:17:47,030 --> 00:17:52,760 How cool is that sticks for you right there ready for you to use without having to grab it out of the 286 00:17:53,240 --> 00:17:54,230 out of the array itself. 287 00:17:54,260 --> 00:17:57,190 And then we just we're done in this case we're just printing it right. 288 00:17:57,740 --> 00:18:00,570 Pretty good stuff I think. 289 00:18:00,830 --> 00:18:03,080 And so it's doing the exact same thing as you can see right here. 290 00:18:03,260 --> 00:18:04,940 It's printing up all of these salaries here. 291 00:18:04,940 --> 00:18:11,960 And so this is a for loop as well but may also want to call a For Each loop ok for each salary in salaries 292 00:18:12,260 --> 00:18:13,880 grabs each item out of the array. 293 00:18:13,880 --> 00:18:18,920 One at a time puts into this variable so you can use it and when it gets to the end your loop is done. 294 00:18:18,920 --> 00:18:22,130 So you don't ever have to worry about an infinite loop. 295 00:18:22,130 --> 00:18:28,160 For the most part in this case whereas right here we had to create some condition to get rid of it to 296 00:18:28,160 --> 00:18:29,220 get out of the loop. 297 00:18:29,240 --> 00:18:29,920 OK. 298 00:18:30,320 --> 00:18:32,780 So really cool stuff loops. 299 00:18:32,780 --> 00:18:36,890 This is what you're going to do most of the time there's a lot more that goes into it and they get trickier 300 00:18:36,890 --> 00:18:37,760 as you go down the line. 301 00:18:37,760 --> 00:18:43,160 But for most of what we'll be doing and for most of what you'll be doing this kind of covers the basics 302 00:18:43,580 --> 00:18:49,700 of what you spend most of your time working on when it comes to loops and arrays. 303 00:18:50,310 --> 00:18:51,000 So that's it. 304 00:18:51,000 --> 00:18:53,760 Mark Price of slopes of dot com. 305 00:18:53,770 --> 00:18:54,730 See you next time.