BackButtonHandler.Update C# (CSharp) Method

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            if (currentScene.Equals(LoadingScreen1) || currentScene.Equals(LoadingScreen2) || currentScene.Equals(LoadingScreen3)) ;
            else if (currentScene.Equals(mainScene)) mainMenuActions();
            else if (currentScene.Equals("BackButtonTest")) Application.Quit();
            else if (currentScene.Equals(levelSelectScene)) Application.LoadLevel(mainScene);
            else defaultAction();
        }
    }