How does putting return; at line 12 solve my prob of creating an xtra gameObj ,script is attached to

Code (CSharp):

1. public class MainManager : MonoBehaviour
2. {
3.     public static MainManager Instance;
4.  
5.     public Color TeamColor;
6.  
7.     private void Awake()
8.     {
9.         if (Instance != null)
10.         {
11.             Destroy(gameObject);
12.             return;
13.         }
14.  
15.         Instance = this;
16.         DontDestroyOnLoad(gameObject);
17.  
18.         LoadColor();
19.     }

 

What?

 

When I put return; at line12 , the gameobject this script is attached to is not created extra times during scene change.How?

 

If you don't return there, then here's what happens:

1) Object A starts, sets "instance" to itself, and runs as expected.
2) Object B starts. It sees "instance", so destroys itself. But because it continues running, it also sets "instance" to itself. So you now have object A (exists, but is not "instance") and object B is destroyed (leaving "instance" to point to nothing)
3) Object C starts. Because B was destroyed, it sees that "instance" is null, and sets "instance" to itself. You now have A nd C in the scene, with C being "instance".
4) Object D starts, and does the same thing as B did. You now have objects A and C, neither of which is "instance".

And so on. So basically, every other copy of this will be left behind.

 

So basically what did return; do here.

 

return; exits out of the current method and doesn't execute any code in the method after that line.
https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/return