如何比较对象在数组中的位置？

Question

so i was trying to compare a position of an object within an array with an int variable that i have

I have this variable called stagePos, and i wanna use it to find an object that has the same value for its position in an array

If the stagePos is 1, then i want to find an object that has the position of [1] in an array and do something with it as well as do something with the other object in that array because they don't have the same value as stagePos

if(stage[i] != stage[stagePos]){
     Vector3 pos = stage[i].transform.position;
     pos += new Vector3(0f, -4f * Time.deltaTime , 0f);
     stage[i].transform.position = pos;
     stageScript.Invinsible(true);
}
else if(stage[i] == stage[stagePos]){
     Vector3 pos = stage[i].transform.position;
     pos += new Vector3(0f, 4f * Time.deltaTime, 0f);
     stage[i].transform.position = pos;
     stageScript.Invinsible(false);
}

Answer 1

i want the code to just sit there and wait until there's a change with the stagePos value

So basically there is no issue in your code you just want it to be event driven instead of using Update . We don't see how and where exactly you change the value of stagePos but I would either use a method like

public void SetStagePos(int value)
{
    // ignore if same value
    if(stagePos == value) return;

    stagePos = value;

    for(var i = 0; i < stage.Length; i++)
    {
        // This could be actually done in one line
        stage[i].transform.position += new Vector3(0f,(i == stagePos ? 1 : -1) * 4f * Time.deltaTime , 0f);

        //Note: it is unclear where you want to go with the 
        //stageScript.Invisible()
        // since currently you anyway call it for all objects
        // so this will always end up with the value of
        // stageScript.Invisible(i == stage.Length - 1);
    }
}

This you would use like eg

private void Update()
{
    if(Input.GetKeyDown(KeyCode.NumPad1))
    {
        SetStagePos(1);
    }
    //etc.
}

or alternatively make stagePos a property with backing field like

private int _stagePos;
private int stagePos
{
    get => _stagePos;
    set =>
    {
        _stagePos = value;
        for(var i = 0; i < stage.Length; i++)
        {
            stage[i].transform.position += new Vector3(0f,(i == stagePos? 1 : -1) * 4f * Time.deltaTime , 0f);

            ....
        }
    }
}

Now everytime you assign a new value to stagePos the setter is called

private void Update()
{
    if(Input.GetKeyDown(KeyCode.NumPad1))
    {
        stagePos = 1;
    }
    //etc.
}

---

Note however that in general your usage of Time.deltaTime really makes only sense in the case this is called every frame!

Depends ofcourse also on how you get the user input which you didn't show.