Loading current scene in Unity 5.5

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from: http://answers.unity3d.com/questions/1109497/unity-53-how-to-load-current-level.html

In “Unity 5.x By Example”, I met Application.LoadLevel (Application.loadedLevel) but it is obsolete according to the documentation and proposed to use SceneManager. Here is how to use SceneManager to load currently active scene (level).

using UnityEngine;
using System.Collections;
using UnityEngine.SceneManagement;

public class Timer : MonoBehaviour
{
    void Update () {
        CountDown-= Time.deltaTime;
        if (CountDown <= 0)
            SceneManager.LoadScene (SceneManager.GetActiveScene ().name);
    }
}

GetActiveScene()  returns the current scene object and then you can use .name  or .buildindex  in LoadScene() .