How instance works?

Questions & Answers
1

hey guys new to unity here, i want to make a game and after searching for script with audio manager in it there is this piece of code that I don’t understand

void Awake() {
if (instance == null)
instance = this;
else if (instance != this)
Destroy(gameObject);
DontDestroyOnLoad(gameObject);
}

I read some web article in google but still doesn’t understand it, whats the use of this code and how does it works. thank you for your time answering

2

This is the basic way of creating a singleton. In other words, having a single instance of the class, and ensuring that any potential duplicates are prevented.

// This is the single instance of this script, accessed using
// ThisScript.instance from anywhere, at any time
public static MyScript instance;

// Runs when the GameObject is activated/initialized
void Awake()
{
	// If instance is not already set...
	if(instance == null)
	{
		// Set "instance" to be the currently-running script
		instance = this;
	}
	// In case this script runs again on this same GameObject,
	// Check whether the "instance" is THIS instance of this script...
	else if(instance != this)
	{
		// Destroy any GameObject using this script that ISN'T the
		// stored "instance" of the script
		destroy(gameObject);
	}
	// Set this GameObject to persist between scenes
	DontDestroyOnLoad(gameObject);
}

Then, to use it from another class…

// Rather than having to keep finding/saving references to the singleton...
MyScript script = GameObject.FindObjectOfType<MyScript>();
script.DoSomething();

// Instead, call the singleton version of that script...
MyScript.instance.DoSomething();