If you hold down button *BUTTON*, speed boost.

Questions & Answers
1

Hello.
I’m working on my game and I’m new to scripting.Like, just learned a few things with the help of Jonathan Weinberger and I’m trying to make my own game now.

So I have a small problem.
I have the player movement script and I want that, when I hold down the button Left Alt, add +10 speed while holding it down but just once, not every frame and when I release the button, get the normal value again.Here’s the script.

		I have a public float called playerSpeed and it's value is 7, I thought this would do the job but it's not working like I wanted to.
----------------------------------------------------------|
		if(Input.GetKeyDown(KeyCode.LeftAlt)){        |
			playerSpeed += 10;                    |
		}                                             |
                                                          |
		else if(Input.GetKeyUp(KeyCode.LeftAlt)){     | 
			playerSpeed -=10;                     |
		}                                             |
  --------------------------------------------------------|

So what I want to happen when I hold Left Alt down is, speed +10, if you release the Left Alt, speed back to 7.
What should I do?
I used GetKeyUp there because I think that’s when you release the button (or am I wrong?).
Help me please, thanks.

2

Alright what I did was to make a new script and copy the script there, I made the playerSpeed float static and added this code.

void Update () {

		if(Input.GetKeyDown(KeyCode.LeftAlt)){
			playerMovement.playerSpeed += 10;
		}
		
		else if(Input.GetKeyUp(KeyCode.LeftAlt)){
			playerMovement.playerSpeed -= 10;
		}
	
	}

Problem is , if I press Alt the ship goes down for some reason, why?