1 00:00:00,170 --> 00:00:03,950 Welcome back, my fellow game developers. 2 00:00:03,945 --> 00:00:08,535 In this video, we are making the game so much cooler. 3 00:00:08,535 --> 00:00:12,335 So finally, this video makes everything look amazing. 4 00:00:12,330 --> 00:00:13,860 So we start off the game. 5 00:00:13,860 --> 00:00:15,020 We start running around, 6 00:00:15,015 --> 00:00:16,125 oh no, there is a door. 7 00:00:16,125 --> 00:00:16,985 It's closed. 8 00:00:16,980 --> 00:00:18,770 Oh, no. Let's go to the next door. 9 00:00:18,765 --> 00:00:20,505 Oh, no, it's close though. 10 00:00:20,505 --> 00:00:22,275 There are three enemies in here. 11 00:00:22,275 --> 00:00:24,735 Oh, they tried to shoot as they try to follow as nope, 12 00:00:24,735 --> 00:00:26,165 we kill the first one. 13 00:00:26,160 --> 00:00:30,230 Maybe he takes a lot of it's the second one. How many does it take? 14 00:00:30,230 --> 00:00:33,040 One hit his dies and his pleasure, blood. 15 00:00:33,035 --> 00:00:35,155 We call this one. We tried to kill the last one. 16 00:00:35,150 --> 00:00:37,160 We are shooting him as he shooting back. 17 00:00:37,160 --> 00:00:40,100 Nope, he's not. Wait, but Tim shu Okay, It's not shooting. 18 00:00:40,100 --> 00:00:43,280 So we should have, there are things flying in our direction. 19 00:00:43,280 --> 00:00:45,760 We should around him and he dies. 20 00:00:45,755 --> 00:00:46,405 Amazing. 21 00:00:46,400 --> 00:00:48,190 So there you go. The doors are open. 22 00:00:48,185 --> 00:00:52,195 We walked through and now we can go to the next level or we could 23 00:00:52,190 --> 00:00:56,650 use the other door because it also opens when we kill all of our enemies. 24 00:00:56,645 --> 00:00:58,825 So let's not waste any more time. 25 00:00:58,820 --> 00:01:00,730 We will fix this thing right here, 26 00:01:00,725 --> 00:01:03,005 seeing the blue things around us, 27 00:01:03,005 --> 00:01:05,635 and let's get started. 28 00:01:05,630 --> 00:01:07,550 Oh, case. 29 00:01:07,550 --> 00:01:13,100 So now it's time to open up the doors whenever the enemies are killed, 30 00:01:13,100 --> 00:01:16,070 let's go into the enemies right here or the room. 31 00:01:16,070 --> 00:01:17,900 Actually run the game. 32 00:01:17,900 --> 00:01:21,920 And I'm going to try to kill a couple of enemies that's opened up. 33 00:01:21,920 --> 00:01:22,760 There you go. 34 00:01:22,760 --> 00:01:24,740 Let's shoot the enemy right here. 35 00:01:24,740 --> 00:01:27,080 Three bullets should be enough, and he's dead. 36 00:01:27,080 --> 00:01:30,620 And you can see right here that he is now a missing. 37 00:01:30,620 --> 00:01:32,300 Very good. He is missing. 38 00:01:32,300 --> 00:01:33,880 The second one is missing. 39 00:01:33,875 --> 00:01:36,115 The third one is also missing, 40 00:01:36,110 --> 00:01:38,000 so we no longer have any enemies. 41 00:01:38,000 --> 00:01:40,010 The door should open. 42 00:01:40,010 --> 00:01:44,360 The only problem is that we still have these elements in here. 43 00:01:44,360 --> 00:01:46,940 But thankfully, when we're working with lists, 44 00:01:46,940 --> 00:01:51,290 we can actually remove the item very easily. 45 00:01:51,290 --> 00:01:53,200 So the way we do that, 46 00:01:53,195 --> 00:01:58,315 as we go into our updating here in the rooms manager update. 47 00:01:58,310 --> 00:02:01,790 And we are going to create another loop. 48 00:02:01,790 --> 00:02:05,390 And this time this loop is going to be a for loop. 49 00:02:05,390 --> 00:02:07,300 So what is a for loop? 50 00:02:07,295 --> 00:02:08,365 Let me explain. 51 00:02:08,360 --> 00:02:11,360 So what is a for loop? 52 00:02:11,360 --> 00:02:15,200 Loops can execute a block of code number. 53 00:02:15,200 --> 00:02:18,470 Times. Loops are handy if you want to run 54 00:02:18,470 --> 00:02:23,260 the same code over and over again each time with a different value. 55 00:02:23,255 --> 00:02:27,205 Now, I'm delving a bit deeper into loops than we did with the for each, 56 00:02:27,200 --> 00:02:32,060 but not worry for loops are similar to for-each loops. 57 00:02:32,060 --> 00:02:34,730 But this time instead of using the items, 58 00:02:34,730 --> 00:02:41,300 we use the indexes and side of the list or the array. 59 00:02:41,300 --> 00:02:44,800 So you can see that this continues to execute 60 00:02:44,795 --> 00:02:48,395 code inside until I reaches a certain limit. 61 00:02:48,395 --> 00:02:50,315 What does that mean? 62 00:02:50,315 --> 00:02:54,185 Let's look through this syntax right here and understand it better. 63 00:02:54,185 --> 00:02:57,265 We start off by writing for, That's good. 64 00:02:57,260 --> 00:03:00,830 We instantiate a variable which is an integer, 65 00:03:00,830 --> 00:03:03,940 most probably which is an I equals 0. 66 00:03:03,935 --> 00:03:06,245 We then add this semicolon. 67 00:03:06,245 --> 00:03:12,005 We then tell it what is the limit that the I will keep working towards. 68 00:03:12,005 --> 00:03:16,135 And then we stop and each time we add one to the eye. 69 00:03:16,130 --> 00:03:18,050 So you can see right here, this plus, 70 00:03:18,050 --> 00:03:20,770 plus means that it's I plus one. 71 00:03:20,765 --> 00:03:22,315 So we start off at 0, 72 00:03:22,310 --> 00:03:25,160 let's say the certain limit is three. 73 00:03:25,160 --> 00:03:31,630 We will continue looping through until I is no longer less than three. 74 00:03:31,625 --> 00:03:33,155 So we start off at 0, 75 00:03:33,155 --> 00:03:36,295 we do some stuff, we execute the code I plus, plus. 76 00:03:36,290 --> 00:03:38,230 That means I becomes one. 77 00:03:38,225 --> 00:03:40,055 It's still less than three. 78 00:03:40,055 --> 00:03:42,025 Great, we continue on. 79 00:03:42,020 --> 00:03:43,880 We have I plus two, 80 00:03:43,880 --> 00:03:45,370 as it's still less than three. 81 00:03:45,365 --> 00:03:46,885 It is, we continue. 82 00:03:46,880 --> 00:03:49,190 I equals three is it's still less than three. 83 00:03:49,190 --> 00:03:54,580 No, it's not because we need to be less than 3 or less than the certain limit. 84 00:03:54,575 --> 00:03:59,935 And we are going to be using that to see we are going to count through all the enemies. 85 00:03:59,930 --> 00:04:02,810 And when we are at the last enemy, 86 00:04:02,810 --> 00:04:06,710 we are going to go ahead and stop the loop. 87 00:04:06,710 --> 00:04:11,260 And at each level we are going to check if that enemy is an empty game object, 88 00:04:11,255 --> 00:04:14,435 then we are going to remove the entire item from the list. 89 00:04:14,435 --> 00:04:16,255 So let's get started. 90 00:04:16,250 --> 00:04:18,110 This will be a bit complicated, 91 00:04:18,110 --> 00:04:19,720 but bear with me. 92 00:04:19,715 --> 00:04:23,395 So I'm going to go ahead and create a for loop. 93 00:04:23,390 --> 00:04:27,350 And instead of going from the first element to the last element, 94 00:04:27,350 --> 00:04:29,300 I'm going to start at the back. 95 00:04:29,300 --> 00:04:37,970 So I'm going to have an int I equals enemies dot count minus1. 96 00:04:37,970 --> 00:04:39,650 First of all, what is the count? 97 00:04:39,650 --> 00:04:44,020 Enemies dot count is the number of items that we have in the list. 98 00:04:44,015 --> 00:04:47,155 And our case, this will be the three skeletons. 99 00:04:47,150 --> 00:04:49,100 Why am I adding minus one? 100 00:04:49,100 --> 00:04:53,600 Because lists work just as arrays do where we start, 101 00:04:53,600 --> 00:04:56,660 the counting of the indexed from 0. 102 00:04:56,660 --> 00:05:00,170 The last element of the three skeletons will be two. 103 00:05:00,170 --> 00:05:01,670 We have the skeleton zeros, 104 00:05:01,670 --> 00:05:03,520 skeleton one skeleton too. 105 00:05:03,515 --> 00:05:07,545 So count is equal to three because we have three skeletons. 106 00:05:07,549 --> 00:05:11,979 So the first element should be the count minus one. 107 00:05:11,975 --> 00:05:14,025 I hope that is understood. 108 00:05:14,029 --> 00:05:16,369 Now because we are starting from the back, 109 00:05:16,370 --> 00:05:17,720 what is our goal? 110 00:05:17,720 --> 00:05:19,730 We will keep looping through. 111 00:05:19,730 --> 00:05:24,530 While i is greater than minus one. 112 00:05:24,530 --> 00:05:27,010 Why is this minus1? 113 00:05:27,005 --> 00:05:29,485 Well, because when we get to 0, 114 00:05:29,480 --> 00:05:32,710 we still want to loop through the list. 115 00:05:32,705 --> 00:05:36,785 And one we get two minus one because let me just finish this off. 116 00:05:36,785 --> 00:05:37,375 There you go. 117 00:05:37,370 --> 00:05:38,800 Because we are going. 118 00:05:38,795 --> 00:05:40,195 Minus minus. 119 00:05:40,190 --> 00:05:41,810 So just like Plus, 120 00:05:41,810 --> 00:05:43,280 Plus adds a one, 121 00:05:43,280 --> 00:05:45,730 minus, minus removes a one. 122 00:05:45,725 --> 00:05:48,125 So again, what's happening? 123 00:05:48,125 --> 00:05:50,935 We are starting from the back of the list. 124 00:05:50,930 --> 00:05:56,210 We are making sure that we always are greater than minus one, 125 00:05:56,210 --> 00:06:00,670 which means we don't want to have 0 as the last element that we go through. 126 00:06:00,665 --> 00:06:04,765 And finally, we are adding I minus minus. 127 00:06:04,760 --> 00:06:06,820 So let's continue one. 128 00:06:06,815 --> 00:06:08,995 What are we going to do in here? 129 00:06:08,990 --> 00:06:13,430 Well, we are going to check if the enemies 130 00:06:13,429 --> 00:06:20,319 or the enemy at the position I is equal to null. 131 00:06:20,315 --> 00:06:23,005 So null means that he is missing. 132 00:06:23,000 --> 00:06:26,720 We saw previously in a previous video when we kill the skeletons, 133 00:06:26,719 --> 00:06:28,989 the element in there became missing. 134 00:06:28,985 --> 00:06:30,485 That means it's not. 135 00:06:30,485 --> 00:06:35,375 So if the enemy or the collider 2D is missing on this enemy, 136 00:06:35,375 --> 00:06:38,755 than what we're going to do is we're going to access the enemies. 137 00:06:38,750 --> 00:06:44,900 Dot remove at, and we're going to remove it at the position I. 138 00:06:44,900 --> 00:06:50,080 So again, let's just look at it one more time and understand what's happening. 139 00:06:50,075 --> 00:06:56,225 We are starting at the back of the line because we want to remove things from down to, 140 00:06:56,225 --> 00:06:58,165 up until we get to the first one. 141 00:06:58,160 --> 00:07:00,320 So we are starting from the back. 142 00:07:00,320 --> 00:07:05,740 We are using count minus one because count is the number of elements, 143 00:07:05,735 --> 00:07:09,175 but the elements inside are indexed from 0. 144 00:07:09,170 --> 00:07:11,380 So we start at 0, 1, 2, 145 00:07:11,375 --> 00:07:13,015 but the count is three, 146 00:07:13,010 --> 00:07:14,470 so we remove one. 147 00:07:14,465 --> 00:07:19,895 We keep removing one by using AI minus-minus until we 148 00:07:19,895 --> 00:07:25,145 are no longer greater than minus one y. I mean, 149 00:07:25,145 --> 00:07:27,655 when we are less than minus one, why? 150 00:07:27,650 --> 00:07:31,430 Because the last one is going to be 0, so minus1, 151 00:07:31,430 --> 00:07:32,870 when we become minus1, 152 00:07:32,870 --> 00:07:36,700 that means we've ended and we no longer want to continue on with the loop. 153 00:07:36,695 --> 00:07:42,185 And each time we find that the enemies is missing or is null, 154 00:07:42,185 --> 00:07:45,365 we are going to remove them from the list. 155 00:07:45,365 --> 00:07:47,905 Great, Let's save that. 156 00:07:47,900 --> 00:07:56,100 Let's go back into our game and let's go ahead and print out in here the enemies. 157 00:08:02,440 --> 00:08:06,600 Okay, So enemies.gov. 158 00:08:06,610 --> 00:08:09,160 And let's just see what happens. 159 00:08:09,155 --> 00:08:11,365 So back in our game, 160 00:08:11,360 --> 00:08:14,140 I'm going to run the gain. 161 00:08:14,135 --> 00:08:16,495 I have the list of enemies, 162 00:08:16,490 --> 00:08:18,250 I'm going to shoot first 1, 163 00:08:18,245 --> 00:08:20,135 second 1, and the third one. 164 00:08:20,135 --> 00:08:22,925 So let's wait for the books to appear. 165 00:08:22,925 --> 00:08:25,655 There you go. You can see a pop-up. Oh, okay. 166 00:08:25,655 --> 00:08:28,045 So now you can see that the list is empty. 167 00:08:28,040 --> 00:08:30,320 There's something I forgot to say. 168 00:08:30,320 --> 00:08:36,310 So we can see we have these and we didn't look at the Council even that may appear. 169 00:08:36,305 --> 00:08:39,145 So the number of enemies a three, when I shoot them, 170 00:08:39,140 --> 00:08:40,390 one of them dies, 171 00:08:40,385 --> 00:08:42,175 the last element is removed. 172 00:08:42,170 --> 00:08:44,840 That's why we are going from the bottom to the top. 173 00:08:44,840 --> 00:08:47,270 So the number of enemies is to 0. 174 00:08:47,270 --> 00:08:50,620 So the bullets that work for that kept going. Also. 175 00:08:50,615 --> 00:08:52,345 This one, there you go, 176 00:08:52,340 --> 00:08:57,370 The number of elements or the number of enemies is 0. 177 00:08:57,365 --> 00:09:00,835 Great. So now we know that we are able to kill the enemies. 178 00:09:00,830 --> 00:09:03,400 We are able to remove them from the list. 179 00:09:03,395 --> 00:09:08,845 Lastly, we want to open the door whenever the number of enemies 0, 180 00:09:08,840 --> 00:09:12,410 and that's going to be part of your challenge. 181 00:09:12,410 --> 00:09:16,060 Your challenge is to open the doors after the enemies die. 182 00:09:16,055 --> 00:09:19,345 So check to see that the enemies list is empty. 183 00:09:19,340 --> 00:09:21,250 This will be, I don't know, 184 00:09:21,245 --> 00:09:22,985 I will leave it to you. 185 00:09:22,985 --> 00:09:28,025 Then you'll need to go through all the doors and the doors to close. 186 00:09:28,025 --> 00:09:31,075 And you'll need to activate all of the doors. 187 00:09:31,070 --> 00:09:32,920 And I'll give you a small hint. 188 00:09:32,915 --> 00:09:34,895 You need to check the list length. 189 00:09:34,895 --> 00:09:37,175 You can use the dot count. 190 00:09:37,175 --> 00:09:38,495 Well, we've already done this. 191 00:09:38,495 --> 00:09:44,065 If you want. You can use a for each loop to go through the doors or you can try 192 00:09:44,060 --> 00:09:49,850 to use the for loop that we just learned and to get the length of the array, 193 00:09:49,850 --> 00:09:52,100 this is a good exercise in loops. 194 00:09:52,100 --> 00:09:54,070 We have a lot of loops. That's good. 195 00:09:54,065 --> 00:09:59,335 So pause the video right now and go do the challenge. 196 00:09:59,330 --> 00:10:01,640 Okay, welcome back. 197 00:10:01,640 --> 00:10:05,000 So I'm just going to keep the debugger right here. 198 00:10:05,000 --> 00:10:06,290 And what we're going to do, 199 00:10:06,290 --> 00:10:14,050 we're going to check if the enemies dot count is equal to 0. 200 00:10:14,045 --> 00:10:18,715 Then we are going to use the for loop. 201 00:10:18,710 --> 00:10:23,450 I'm going to create an int I equals 0. 202 00:10:23,450 --> 00:10:27,040 So we are starting from the 0. 203 00:10:27,035 --> 00:10:35,305 We are going to keep looping while I is less than the doors to open or sorry, 204 00:10:35,300 --> 00:10:37,730 doors to close dot length. 205 00:10:37,730 --> 00:10:40,190 When we want to access the length of an array, 206 00:10:40,190 --> 00:10:45,680 we use dot length when we want to access the length of the list, we use dot count. 207 00:10:45,680 --> 00:10:47,960 So there you go. Now you have two examples. 208 00:10:47,960 --> 00:10:51,940 You can even add a comment in here to make sure that you remember. 209 00:10:51,935 --> 00:10:55,025 And at each step we are going to add a one. 210 00:10:55,025 --> 00:11:01,015 So now door to close or actually door to close. Yes. 211 00:11:01,010 --> 00:11:05,420 And I'm going to access it using the I because I is increasing every time. 212 00:11:05,420 --> 00:11:07,840 So let's say we already have two doors. 213 00:11:07,835 --> 00:11:11,855 So we have index 0 and index one. We start off at 0. 214 00:11:11,855 --> 00:11:14,035 We get the door to close at 0. 215 00:11:14,030 --> 00:11:19,130 We set active to false. 216 00:11:19,125 --> 00:11:20,245 There we go. 217 00:11:20,245 --> 00:11:21,955 We will no longer have the door. 218 00:11:21,955 --> 00:11:23,695 We check is the I, 219 00:11:23,695 --> 00:11:28,585 which is currently 0, is less than the doors dot length, which is 2. 220 00:11:28,585 --> 00:11:31,035 So yes, 0 is less than 2. 221 00:11:31,030 --> 00:11:35,910 I plus, plus, or actually we do this and then I plus, plus. 222 00:11:35,905 --> 00:11:38,865 We go back here, I is, okay, 223 00:11:38,860 --> 00:11:42,910 so we no longer go back here I is now one is one less than two? 224 00:11:42,910 --> 00:11:43,800 Yes, it is. 225 00:11:43,795 --> 00:11:46,855 We have r equals to 0 dot-dot-dot active, 226 00:11:46,855 --> 00:11:48,715 sorry, I equals 1. 227 00:11:48,715 --> 00:11:50,215 We set active. There we go. 228 00:11:50,215 --> 00:11:50,775 It's false. 229 00:11:50,770 --> 00:11:52,440 Finally, I becomes two. 230 00:11:52,435 --> 00:11:53,605 Is two less than two? 231 00:11:53,605 --> 00:11:54,585 No, it's not. B. 232 00:11:54,580 --> 00:11:56,050 Go out of the loop. 233 00:11:56,050 --> 00:11:57,490 We save all of that. 234 00:11:57,490 --> 00:11:59,320 We go back into our game. 235 00:11:59,320 --> 00:12:01,670 We run the gain, 236 00:12:01,665 --> 00:12:04,135 we have the console right here, 237 00:12:04,130 --> 00:12:05,240 so the number of enemies, 238 00:12:05,240 --> 00:12:06,850 F3, you can see them. 239 00:12:06,845 --> 00:12:10,675 We should 12, okay, 240 00:12:10,670 --> 00:12:13,370 the enemies that we shoot him. 241 00:12:13,370 --> 00:12:15,910 Second one, how many bullets does take? 242 00:12:15,905 --> 00:12:19,975 One? It takes only one. Nice. 243 00:12:19,970 --> 00:12:21,370 Let's see why is he? 244 00:12:21,365 --> 00:12:23,965 Because I remember we added his life to be three. 245 00:12:23,960 --> 00:12:24,920 There you go. 246 00:12:24,920 --> 00:12:26,290 The enemy died. 247 00:12:26,285 --> 00:12:30,805 You can see that at 0 the doors open and we can walk through. 248 00:12:30,800 --> 00:12:32,120 How cool is that? 249 00:12:32,120 --> 00:12:35,330 So finally, everything seems to be working, okay. 250 00:12:35,330 --> 00:12:37,100 There are a couple of bugs. 251 00:12:37,100 --> 00:12:40,550 One of them is the blood is not disappearing because of the animations. 252 00:12:40,550 --> 00:12:43,090 We haven't still added the key at the end. 253 00:12:43,085 --> 00:12:44,635 The skeleton right here. 254 00:12:44,630 --> 00:12:46,400 How big is his life? 255 00:12:46,400 --> 00:12:48,650 The enemies house is three, 256 00:12:48,650 --> 00:12:50,330 so there seems to be a problem. 257 00:12:50,330 --> 00:12:52,510 He is dying immediately. Why? 258 00:12:52,505 --> 00:12:57,365 Because if we go into the layer bullet controller, 259 00:12:57,365 --> 00:13:01,495 the damage amount is 100 k. 260 00:13:01,490 --> 00:13:03,330 So the damage amount is standardized. 261 00:13:03,325 --> 00:13:05,585 Life of the enemies is 3. 262 00:13:05,585 --> 00:13:06,805 Think that's the problem. 263 00:13:06,800 --> 00:13:10,280 So let me make the half of this guy. 264 00:13:10,280 --> 00:13:12,230 So I just want to make sure that we are 265 00:13:12,230 --> 00:13:15,980 not having something wrong save that run the game. 266 00:13:15,980 --> 00:13:20,330 Because sometimes we might call a method too many times so we are giving too much damage. 267 00:13:20,330 --> 00:13:23,020 So if I check, okay, so there you go. 268 00:13:23,015 --> 00:13:25,055 He needs several bullets. 269 00:13:25,055 --> 00:13:27,775 123 and there you go. 270 00:13:27,770 --> 00:13:29,600 Okay, so everything is working fine. 271 00:13:29,600 --> 00:13:33,740 The doors are opening whenever we are killing all the enemies, 272 00:13:33,740 --> 00:13:35,590 everything seems to be working. 273 00:13:35,585 --> 00:13:38,125 We've learned a lot about loops in this section, 274 00:13:38,120 --> 00:13:40,390 we've learned actually a lot of information. 275 00:13:40,385 --> 00:13:41,765 I hope you're enjoying. 276 00:13:41,765 --> 00:13:43,255 I hope you're having fun. 277 00:13:43,250 --> 00:13:44,680 I hope you're learning a lot. 278 00:13:44,675 --> 00:13:46,045 I hope you are doing your research. 279 00:13:46,040 --> 00:13:48,740 I hope you are always committing your changes. 280 00:13:48,739 --> 00:13:54,279 I hope your game developer brains are getting stronger with each and every single video. 281 00:13:54,275 --> 00:13:56,435 I hope you are not very frustrated, 282 00:13:56,435 --> 00:13:59,285 and I hope you are very happy. 283 00:13:59,285 --> 00:14:02,225 So I'll see you in the next section. 284 00:14:02,225 --> 00:14:04,825 Don't forget to add a review.