A couple of useful Vector extension methods for creating Vectors based on other vectors

CopyWith.cs

public static class ExtensionMethods
{
    public static Vector2 CopyWith(this Vector2 vector, float? x = null, float? y = null)
    {
        return new Vector2(x ?? vector.x, y ?? vector.y);
    }

    public static Vector3 CopyWith(this Vector3 vector, float? x = null, float? y = null, float? z = null)
    {
        return new Vector3(x ?? vector.x, y ?? vector.y, z ?? vector.z);
    }
}

// Example Usage: transform.localPosition = targetPosition.CopyWith(x: targetPosition.x + 30, y: targetPosition.y - 15);