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Question by FA22X · Dec 05, 2016 at 03:13 AM · c#array-out-of-range-except

array index out of range

using UnityEngine; using System.Collections;

public class Patrol : MonoBehaviour { public Transform[] patrolPoints; public float moveSpeed; private int currentPoint;

 // Use this for initialization
 void Start () {
     transform.position = patrolPoints[0].position;
     currentPoint = 0;
 
 }
 
 // Update is called once per frame
 void Update () {
     if (transform.position == patrolPoints[currentPoint].position)
         {
             currentPoint ++;
         
         }
     transform.position = Vector3.MoveTowards (transform.position, patrolPoints [currentPoint].position, moveSpeed * Time.deltaTime);
 }

}

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avatar image TBruce · Dec 05, 2016 at 03:16 AM 1
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You did not give me anything to go on. The only this that I could do was fix it so thet you dont get the error anymore by perfor$$anonymous$$g range checking

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Patrol : $$anonymous$$onoBehaviour
 {
     public List<Transform> patrolPoints = new List<Transform>();
     public float moveSpeed;
     private int currentPoint;
 
     // Use this for initialization
     void Start ()
     {
         if (patrolPoints.Count > 0)
         {
             transform.position = patrolPoints[0].position;
         }
         currentPoint = 0;
     }
 
     // Update is called once per frame
     void Update ()
     {
         if (patrolPoints.Count > currentPoint)
         {
             if (transform.position == patrolPoints[currentPoint].position)
             {
                 currentPoint ++;
             }
             transform.position = Vector3.$$anonymous$$oveTowards (transform.position, patrolPoints [currentPoint].position, moveSpeed * Time.deltaTime);
         }
     }
 }
avatar image Orami TBruce · Dec 05, 2016 at 03:32 AM 0
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It is likely the reason he is having that issue. I agree. If he is using a list and not an array he can use patrolPoints.Count or an array would would be patrolPoints.Length. Either way he just wasn't checking for OOB

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Answer by iAmAwsum · Dec 05, 2016 at 03:17 PM

You're not checking if the index entered is larger than your array and so it gives you an error. Just simply add another if statement:

 if (transform.position == patrolPoints[currentPoint].position && currentPoint <= patrolPoints.Length)
          {
              currentPoint ++;
          
          }
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avatar image TBruce · Dec 05, 2016 at 06:29 PM 0
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Scenario

  1. currentPoint is equal to patrolPoints.Length

  2. (currentPoint <= patrolPoints.Length) == true == error the next time transform.position == patrolPoints[currentPoint].position occurs

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