A question about IEnumerator

Unity Engine
1

Hi,

I’m a begineer, there is a puzzle to me. please see below:

style1： void Update () {
transform.Translate(Vector3.forwardspeedTime.deltaTime);
}

style2: void Start(){
StartCoroutine(forward());
}

IEnumerator forward() {
while(true){
transform.Translate(Vector3.forwardspeedTime.deltaTime);
yield return null;
}
}

Is there something difference between these two style?

2

The 2nd method runs in parallel to your main update loops. The yields in it are set to delay minimally, so that loop will move your object far more quickly.

3

That is not true! Coroutines do not run in parallel. They are executed after Update.
http://docs.unity3d.com/Documentation/Manual/ExecutionOrder.html

In this example, they are identical.

4

Another difference to watch for with coroutines:
If the game object is ever disabled, the Coroutine will be killed. If the game object is then re-enabled, the Coroutine will not resume unless you start it up again manually. That would not be an issue when moving the object within Update().