DontDestroyOnLoad usage in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to prevent the GameObject from being destroyed when loading a new scene.

Unity

void Awake() {
    [1](gameObject);
}

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ADestroy

BDontDestroyOnLoad

CLoadScene

DInstantiate

Attempts:

3 left

💡 Hint

Common Mistakes

Using Destroy instead of DontDestroyOnLoad

Calling LoadScene inside Awake

Forgetting to pass the GameObject as parameter

The DontDestroyOnLoad method keeps the GameObject alive across scene loads.

2fill in blank

medium

Complete the code to ensure only one instance of the GameObject persists using DontDestroyOnLoad.

Unity

void Awake() {
    if (FindObjectsOfType<[1]> ().Length > 1) {
        Destroy(gameObject);
    } else {
        DontDestroyOnLoad(gameObject);
    }
}

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AGameManager

BTransform

CRigidbody

DCamera

Attempts:

3 left

💡 Hint

Common Mistakes

Using a Unity component like Transform instead of the script class

Not checking the length of found objects

Not calling Destroy on duplicates

This code checks if more than one GameManager exists and destroys duplicates, keeping only one persistent instance.

3fill in blank

hard

Fix the error in the code that tries to use DontDestroyOnLoad incorrectly.

Unity

void Start() {
    [1];
}

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ADontDestroyOnLoad

BDestroy

CDontDestroyOnLoad(gameObject)

DDontDestroyOnLoad(this.gameObject)

Attempts:

3 left

💡 Hint

Common Mistakes

Passing 'this' instead of 'this.gameObject'

Calling DontDestroyOnLoad without parameters

Using Destroy instead of DontDestroyOnLoad

The DontDestroyOnLoad method requires a GameObject as parameter, so this.gameObject is correct.

4fill in blank

hard

Fill both blanks to create a singleton pattern that uses DontDestroyOnLoad correctly.

Unity

public class GameManager : MonoBehaviour {
    private static GameManager [1];

    void Awake() {
        if ([2] != null && [2] != this) {
            Destroy(gameObject);
            return;
        }
        [2] = this;
        DontDestroyOnLoad(gameObject);
    }
}

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Ainstance

BgameObject

Cthis

Dmanager

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for check and assignment

Using 'gameObject' instead of the static instance variable

Not making the variable static

The static variable instance holds the singleton reference. The code checks if instance exists and assigns this to it if not.

5fill in blank

hard

Fill all three blanks to complete the code that prevents multiple instances and uses DontDestroyOnLoad.

Unity

public class AudioManager : MonoBehaviour {
    private static AudioManager [1];

    void Awake() {
        if ([2] != null && [2] != this) {
            [3](gameObject);
            return;
        }
        [2] = this;
        DontDestroyOnLoad(gameObject);
    }
}

Drag options to blanks, or click blank then click option'

Ainstance

CDestroy

DDontDestroyOnLoad

Attempts:

3 left

💡 Hint

Common Mistakes

Using DontDestroyOnLoad instead of Destroy to remove duplicates

Using different variable names for the static instance

Not making the variable static

The static variable instance is used to track the singleton. Duplicate objects are destroyed using Destroy(gameObject).