Loop through a list of Vector3's and see if it is another vector3 and remove it from the list

Question

so I have a list of Vector3's and I would like to loop through it and see if it equals another Vector3.
I've tried to do this but it won't work i get an error that says
Index was out of range. Must be non-negative and less than the size of the collection.

Here is my code:

int n = GameManager.instance.blocks.Count;
                while (n > 1) 
                {
                    if (GameManager.instance.blocks[n] == new Vector3(Mathf.RoundToInt(this.transform.position.x), Mathf.RoundToInt(this.transform.position.y), 0))
                    {
                        GameManager.instance.blocks.Remove(new Vector3(Mathf.RoundToInt(this.transform.position.x), Mathf.RoundToInt(this.transform.position.y), 0));
                    }
                    n--;
                }

But i get the error previously stated, what would I change here?

Thanks

Answer 1

You shouldn't set n to your array size it must be n-1 of your total item size.

int n = GameManager.instance.blocks.Count-1;//last index is n-1
while (n >= 0)//0 is the first index 
{
    if (GameManager.instance.blocks[n] == new 
    Vector3(Mathf.RoundToInt(this.transform.position.x), 
      Mathf.RoundToInt(this.transform.position.y), 0))
      {
          GameManager.instance.blocks.Remove(new Vector3(Mathf.RoundToInt(this.transform.position.x), Mathf.RoundToInt(this.transform.position.y), 0));
      }
      n--;
 }

Answer 2

You shouldn't use "while" loops with Unity.

Vector3 vectorToRemove = new Vector3(Mathf.RoundToInt(this.transform.position.x), Mathf.RoundToInt(this.transform.position.y), 0);

for(int i = GameManager.instance.blocks.Count - 1; i >= 0; --i) 
{
    if(GameManager.instance.blocks[i] == vectorToRemove) GameManager.instance.blocks.Remove(vectorToRemove);
}