Array index out of range(C#)

Questions & Answers
1

Hey :slight_smile: I have seen this problem in many other cases, but I haven’t been able to use those fixes on my problem. I get IndexOutOfRangeExeption: Array index is out of range and it points to line 44. The

Instantiate(challanges [Random.Range(0, challanges.Length)], challengesSpawnPoint.position, Quaternion.identity);

public float scrollSpeed = 5.0f;
public GameObject[] challanges;
public float frequency = 0.5f;
float counter = 0.0f;
public Transform challengesSpawnPoint;

// Use this for initialization
void Start () {
	GenerateRandomChallange ();
}

// Update is called once per frame
void Update () {

	//GenerateObjects
	if (counter <= 0.0f) {
		GenerateRandomChallange ();
	} else {
		counter -= Time.deltaTime * frequency;
	}

	//Scrooling
	GameObject currentChild;
	for (int i = 0; i < transform.childCount; i++) {
		currentChild = transform.GetChild (i).gameObject;
		ScrollChallange(currentChild);
		if (currentChild.transform.position.x <= -15.0f) {
			Destroy (currentChild);
		}
	}

}

void ScrollChallange (GameObject currentChallange){
	currentChallange.transform.position -= Vector3.right * (scrollSpeed * Time.deltaTime);
}

void GenerateRandomChallange(){
	Instantiate(challanges [Random.Range(0, challanges.Length)], challengesSpawnPoint.position, Quaternion.identity);
	counter = 1.0f;
}

}
I’m watching a tutorial where he changes the size from 0 to 1 and Gameobjects into the “challenges”, but when i try to change it from 0 to 1. It just changes itself back to 0. Does anybody know how to fix this? Thanks in advance!

2

To complete doublemax with a simple correction, try this :

	if(challanges.Length > 0){
		Instantiate(challanges [Random.Range(0, challanges.Length -1)], challengesSpawnPoint.position, Quaternion.identity);
	}

Remember that Array.Length returns the total amount in the array. So, if you got 4 challanges (funny typo error there btw) in the array, Random.Range(0, challanges.Length) will return a number between 0 and 4 while you’re actually looking for a random number between 0 (1st challanges) and 3 (4th challange)

Arrays’ ID always starts at 0 with its first “member” while while Array.Length and List.Count return the total members.