How can I change the speed mode in Update?

Question

I want to decide if the speed will be randomly or constant.

In the top of script:

[Header("Speed")]
public float constantSpeed;
public float minRandomSpeed, maxRandomSpeed;
public bool randomSpeed = false;

In Start:

private void Start()
    {
     RandomSpeed();
    }

In Update

private void Update()
    {
        RandomSpeed();
    }

RandomSpeed:

private void RandomSpeed()
    {
        for (int i = 0; i < instancesToMove.Length; i++)
        {
            if (randomSpeed)
            {
                movementSpeeds[i] = Random.Range(minRandomSpeed, maxRandomSpeed);
            }
            else
            {
                movementSpeeds[i] = constantSpeed;
            }
        }
    }

The problem is in the RandomSpeed if randomSpeed is true it will keep giving the movementSpeeds each frame a new random values. But I want that when randomSpeed is true give movementSpeeds new speed values only once. Then if I will set the randomSpeed false then true again then give again new random speed values.

Answer 1

Don't do this:

private void Update()
{
    RandomSpeed();
}

The only thing you should do during Update() regarding speeds is to check to see if the value of randomSpeed has changed, and if so, generate new values (assuming that you want the boolean to change at runtime). You do not, and should not, generate new speed values every frame.