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In this lecture, we're going to create an infinite number of waves using a brand new kind of loop.

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Now, when it comes to creating loops in our code, we've already seen one kind of this at least in

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two different forms.

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And that is our for loop and for loops are great for all kinds of things because they run a set number

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of times and we create a for loop with syntax similar to this.

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So this would loop through all of the children of a game object related to our for loop is the for each

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loop.

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And this works pretty much the same as a regular for loop but doesn't track the iterator.

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So again, we'd have syntax similar to this time loop through all of the children of a game object.

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So for loops are fantastic and we've already encountered them many times so far in the course.

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But there are actually two other types of loop that we haven't encountered yet.

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The first of these is known as a while loop and a while loop will run continuously, providing some

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condition that we give.

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It is true.

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So we might say that while our condition is true, then we're going to run some code.

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And this is actually very similar to how things like the update method in Unity work while the game

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is running.

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We want to run all of the code in an update loop.

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Then onto the final type of loop.

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We've got a do while loop.

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This is somewhat similar to a while loop, but instead it will always run our code at least once and

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then continuously repeat the loop while our condition is true.

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So we might say do some stuff while this condition is true.

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So while loops are great, if we don't know how many times we need to run code and because we don't

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specify the number of loops beforehand, we need to be very careful and beware of infinite loops because

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they're very easy trap to fall into.

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And I myself am notorious for doing this.

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So whenever we have a while loop, we need to make sure we've got some way of setting its condition

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to false to allow us to break out of it.

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So with knowledge of these new kinds of loops, let's jump into our enemy spawn and see if we can't

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infinitely loop through our list of wave configs.

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Now, when it comes to deciding where to place our loop within our enemy spawn, we have a couple of

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options, but I'm going to go with the simplest one and head down to our spawn enemy waves co-writing

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because in here we can get away with pretty much just wrapping all of our code inside of our loop.

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But the question still remains, do we want a wall loop here or a dual loop?

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Well, I think we want a dual loop here because regardless of whether we want to loop through our list

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multiple times, we do want to go through it at least once.

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But rather than just show you how to do this, I think this is going to be your challenge.

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I want you to go ahead and create a new serialized ball variable at the top of our script called is

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looping and this is going to control the condition for our wild loop.

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Then I want you to create a dual loop inside of our spawn enemy waves CO routine that will run all of

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our code once and then repeatedly loop through our wave config list.

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And to give you a hint for the syntax of this, we want to say do all of our code while the condition

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is true and do notice the semicolon there at the end of that wall condition.

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So pause the video now and give that a go.

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Okay.

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Welcome back.

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So at the top of our script, we're going to need a new serialized field of type bull.

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And we said we were going to call this is looping and then down in our spawn enemy waves co routine

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we want to say do all of our code here

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while is looping.

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So if we now save our script and jump into unity, and if we look at our enemy spawning here, we'll

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see that we've got this is looping flag to speed up testing.

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Let's set our time between waves down to zero.

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And for our first test we're going to leave this is looping unchecked.

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If we go ahead and hit play, we should find that we just loop through the two waves in our enemy config

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list.

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So there goes our first wave.

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Here comes our second wave, but no third wave is generated.

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If we come out of play mode, check our is looping boolean and then hit play again.

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This time we should loop through our two waves and then that cycle will continue to repeat.

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So there's our first wave.

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Here's our second wave.

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Our third wave is coming in.

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And now we have our fourth wave.

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So our looping structure seems to be working and this will continue forever.

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And if we want to break out of this loop, we just need to set is looping to false.

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We're not doing that in code, but we can do it in the inspector.

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So if we uncheck is looping here, we'll finish the final loop through all of our wave configs and then

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no more waves get generated.

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So congratulations on creating infinite waves using a do while loop and with our wave system pretty

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much complete.

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Now let's have a look at adding some player health and enemy damage.

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We'll start looking at that in the next lecture.

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So I'll see you there.