The following is an example of how easy it is to convert your Unity C# code to Unity JavaScript code and vice versa. You can find on the web a lot of different automatic tools that you can use for free in order get conversation between Unity Scripts done as early as possible. As an example, you can convert Unity JS to Unity C# on this http://www.m2h.nl/files/js_to_c.php.
By default, the Unity JS code variables are public and visible in Unity Inspector. In order to hide your variables from Unity inspector or from other classes, you should mark all those variables with a private keyword as shown in the following simple examples:
// private variables are invisible in Unity Inspector private var length : float = 2.9; // visible in Unity Inspector var title : String = "Title"; // visible in Unity Inspector var isLoop : boolean = false;