How can I set AnimationCurve by script?

Question

In the top of the script:

public AnimationCurve curve;

Then the object in the editor have AnimationCurve but without any curve yet:

I want to set one of the curves via the script in the Start.

For example to select this one the most one in the right:

Answer 1

In top of script:

public AnimationCurve curve;

In Start:

public void Start()
    {
      if(curve == null)
        {
          curve = new AnimationCurve(new Keyframe(0, 0), new Keyframe(1, 1));
        }
        curve.preWrapMode = WrapMode.Clamp;
        curve.postWrapMode = WrapMode.Clamp;
    }