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There's a quick piece of tidy up that I want to do, and I'm going to set this to you as a nice, meaty

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challenge.

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And that is when we bump on the ground, we no longer have control.

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But if we bounce twice, then it plays the sound effect twice and plays the particle effect twice as

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well.

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So that's something that I want us not to have when you bounce.

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Once we have one particle effect, we have one sound effect, but it doesn't trigger for the second

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time or the third time or the fifth time, depending upon where you're crashing and how you crash.

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So I'm going to give this to you as a challenge to stop the double plays, implement some code so that

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the crash, sound effects and particle effect can only be triggered once.

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And if you'd like some hints, then hang around.

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If you don't need any hints, pause a video and dive into that.

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Now see if you can figure it out.

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And I encourage you to give it at least a bit of a try before you listen to the hints here.

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Give it a go.

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But if you do want some hints, here they are, consider using a bull.

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We used a bull in the last lecture, so that's fresh in our memory and also consider using the and operator

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which is these two ampersand that's the name of this sign these two ampersand together to see if something

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and something is true.

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So there's a couple of hints for you.

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Pause the video, take on that challenge.

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See you back here when you're done.

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Right.

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So I need to be in crash detector.

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And within here, I'm going to set myself up a bull.

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That will be.

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Let's see, something.

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As long as I bull has crashed, I think because that will signal that it's the end of what's going on

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here has crashed and we're going to initialize that at false because you haven't crashed as a default.

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It's only once you crash that you crash.

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And then when we bounce into the ground, the first thing I'm going to do is say, well, you have crash,

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you now have officially have crash.

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So has crashed equals true.

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We're going to change our ball.

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And now the most important part of this is is to say, don't do all this stuff if you've already crashed.

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And the way we can do that is pretty simple.

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In our if statement here we've got if we've bumped into the ground, we can add in here and has crashed

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is what is equal false.

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So I could type it like this equals equals false or we could do it a slightly quicker way, which is

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to put an exclamation mark in front of has crashed, which means not has crashed.

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So if you have not crashed already then do these things.

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The first thing we'll do is change it over to be true.

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So yeah, you have now actually crashed, but go ahead and finish what is in this method.

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We haven't talked about this much, but all of the code within a block, a code block here will execute

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before any of those things is going to change our if statement.

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So yes I've got has crashed equals true but it's not then going to change the fact that we are executing

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our code block.

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It's going to execute this and this and this and that.

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And then if we bump into the ground again, it will come back and say, okay, are these conditions

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being met?

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Yes or no?

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So just to be clear on that, that this will all be executing, despite the fact that we've got this

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at the top, it doesn't change it and exit out of our method.

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Now let's save and see if this works.

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If I've got all the steps or if I've missed any of the steps bounce.

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And you can see I bounce a couple of times after that, but there was no extra sound effect and no practical

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effect.

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So that was exactly what I was going for, just to tidy up that little double bounce thing.

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So that was a very quick one, quick little exercise there and tidying up our code, nothing more.

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In this lecture.

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I will see you in the next one.