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In this video, we're gonna give ourselves a way to have our waves loop over, and 3

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over, and over. 4

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So even if you have only two ways, and I'm gonna change my to two here, 5

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it just goes wave one, wave two, wave one, wave two, over, and over, and over so 6

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that our game can loop. 7

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So we'll hop over into EnemeySpawner.cs, create ourselves a variable. 8

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So we'll serialize this, so it's available in the inspector. 9

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We're making a bool, so it's either gonna be either true or it's gonna be false and 10

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we'll call it looping. 11

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So I have a bool called looping, which we will initialize as false. 12

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So bool looping = false;. 13

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And then within our start method here's something really cool. 14

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We're we can say we can change the type of return value for our start method. 15

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So that when the engine calls start, it is doing something a little bit different, 16

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we can change it to an IEnumerator, 17

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so that we make our start a code routine, which is really nifty. 18

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And then within our StartCoroutine, 19

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just gonna put my curly braces down a line here. 20

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So within our StartCoroutine we can create a do while loop, 21

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which basically means it goes over and over and over at do while. 22

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And we'll make it while looping is true. 23

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So we'll give ourselves a little bit of room here and start by typing do. 24

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And then give ourselves a code block in here of curly braces. 25

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We're going to change our stock StockCoroutines inot our yield conditions. 26

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So yield return StartCoroutine SpawnAllWaves. 27

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So this now becomes the yield condition. 28

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Once we get into the do while loop, we're saying do a thing, go, go, go, go, go. 29

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And then, once it's finished doing all this, 30

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the yield will then return back within our start method. 31

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And we can say, close our, curly braces here, so we've got our yield condition. 32

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And then we can say, While (looping). 33

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And this is another way of saying While (looping) equals true. 34

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We can say while, and then in brackets, looping. 35

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So what we're doing here is saying when the engine call start, do this thing, 36

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start the co-routines. 37

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This is a series co-routine. 38

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And we are gonna yield. 39

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So come back to start and 40

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continue with whatever is after this statement once this has completed. 41

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So once this completed, we come back here. 42

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We see the while. 43

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If looping is true, then it jumps back up to the do and 44

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it starts this all over again. 45

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And because it started as part of the yield, then it waits until it's finished, 46

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then it comes back to the while. 47

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So this is a really neat loop and 48

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a really neat way of saying we can do this particular thing here, this SpawnAllWaves, 49

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we can do it over, and over, and over, so we can loop it in there. 50

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So we'll save this up and hop over into Unity, check that it all worked. 51

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The first thing we need to do is click On for Looping. 52

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So let's check it without looping on, and make sure it's working as we're expecting. 53

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You might wanna stop at the end of a number of waves, and 54

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then the player can go on to another level, so you don't want it to loop. 55

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Okay, that's it without looping. 56

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We'll click Looping On, click on Play, and 57

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we should see these waves looped over and over. 58

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Okay, once, twice, okay, so you can see, they just keep getting spawned, 59

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and spawned, and spawned. 60

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And so you can imagine, this is a game, if we're spawning all these waves, and 61

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the game is just going on and on, 62

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you don't have to have to have created 300 different waves. 63

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You can create a certain number 10 or 20 or 30 and the game will go on and 64

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on forever. 65

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And if you make your enemies engaging, if you make your waves interesting and 66

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all that kind of good stuff then the player is gonna feel like this is 67

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a pretty awesome game to play for a bunch of time. 68

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Okay, so it's just a quick lecture on the do while loop and 69

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how we have used that within our co-routine and how we have changed our 70

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Start method to be an IEnumerator so that we can use it as a co-routine. 71

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Great work, well done, I'm sure you're game is shaping up really nicely. 72

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I look forward you seeing your sharing in the community. 73

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If you've got something neat that you're enjoying with your waves, 74

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then please do share it with us, and I'll see you in the next lecture.