State synchronization in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a synchronized variable in Unity using Mirror.

Unity

[SyncVar] private [1] playerHealth = 100;

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Aint

Bstring

Cbool

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string or bool type for health causes errors or unexpected behavior.

The [SyncVar] attribute is used to mark variables that should be synchronized across the network. Here, int is the correct type for health.

2fill in blank

medium

Complete the code to send a command from the client to the server in Unity Mirror.

Unity

[Command] public void CmdChangeColor(Color [1]) { playerColor = color; }

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Achange

BnewColor

Ccolor

Dcol

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name that doesn't match the variable inside the method causes errors.

The parameter name color matches the variable used inside the method to update playerColor.

3fill in blank

hard

Fix the error in the code to properly synchronize a player's score using SyncVar hook.

Unity

[SyncVar(hook = nameof(OnScoreChanged))] private int [1];

void OnScoreChanged(int oldScore, int newScore) {
    scoreText.text = newScore.ToString();
}

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AscoreValue

BplayerScore

Cpoints

Dscore

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that doesn't match the hook method causes synchronization issues.

The variable name score matches the hook method's expected parameter and usage.

4fill in blank

hard

Fill both blanks to create a filtered dictionary for high scores (above 10).

Unity

private Dictionary<string, int> playerScores = new Dictionary<string, int>();

var highScores = playerScores.Where(kvp => kvp.Value > 10).ToDictionary(kvp => kvp.[1], kvp => kvp.[2]);

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AKey

BValue

Cvar

DplayerScores

Attempts:

3 left

💡 Hint

Common Mistakes

Using the whole variable instead of .Key or .Value causes errors.

To create a filtered dictionary using LINQ, use Key for keys and Value for values, filtering scores greater than 10.

5fill in blank

hard

Fill all three blanks to correctly update and synchronize a player's position on the server.

Unity

[Command]
public void CmdUpdatePosition(Vector3 [1]) {
    transform.[2] = [3];
}

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AnewPosition

Bposition

DlocalPosition

Attempts:

3 left

💡 Hint

Common Mistakes

Using localPosition instead of position changes local space, not world space.

The method receives newPosition, which is assigned to transform.position to update the player's position on the server.