State machines for AI behavior in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an enum for AI states.

Unity

public enum AIState { Idle, [1], Attack }

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APatrol

BRun

CJump

DSleep

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated states like 'Run' or 'Jump' which are not typical AI states here.

The enum AIState defines different states for the AI. 'Patrol' is a common state between Idle and Attack.

2fill in blank

medium

Complete the code to set the initial AI state to Idle.

Unity

private AIState currentState = [1];

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AAIState.Patrol

BAIState.Attack

CAIState.Idle

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the state to Patrol or Attack initially without reason.

The AI starts in the Idle state, so we assign currentState to AIState.Idle.

3fill in blank

hard

Fix the error in the switch statement to handle the AI states correctly.

Unity

switch (currentState) {
    case AIState.Idle:
        IdleBehavior();
        break;
    case AIState.Patrol:
        [1]();
        break;
    case AIState.Attack:
        AttackBehavior();
        break;
}

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APatrolBehavior

BIdleBehavior

CAttackBehavior

DRunBehavior

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the wrong behavior method like IdleBehavior or AttackBehavior in the Patrol case.

For the Patrol state, the method PatrolBehavior() should be called to define its behavior.

4fill in blank

hard

Fill both blanks to update the AI state from Idle to Patrol when a condition is met.

Unity

if (currentState == [1] && seesEnemy == false) {
    currentState = [2];
}

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AAIState.Idle

BAIState.Attack

CAIState.Patrol

DAIState.Sleep

Attempts:

3 left

💡 Hint

Common Mistakes

Using Attack or Sleep states incorrectly in this condition.

The AI changes from Idle to Patrol when it does not see an enemy.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping AI states to their behavior methods.

Unity

private Dictionary<AIState, Action> stateActions = new Dictionary<AIState, Action>() {
    { [1], IdleBehavior },
    { [2], PatrolBehavior },
    { [3], AttackBehavior }
};

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AAIState.Idle

BAIState.Patrol

CAIState.Attack

DAIState.Sleep

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong states like Sleep or mismatching keys and methods.

The dictionary links each AIState to its corresponding behavior method.