Auto-type text does not change to the next sentence

Question

 using UnityEngine;
 using System.Collections;
 
 
 //How to Use
 //Add this script to GUITEXT
 
 public class autoType : MonoBehaviour {
 
     //speed
     public float letterPause = 0.1f;
     //public AudioClip sound;
 
     //declare stanzas
     string stanza,stanza2,stanza3,stanza4;
     int where;
     
     // Use this for initialization
     void Start () {
         //put sentences here
         stanza = "THIS IS IT";
         stanza2 = "new Message";
         stanza3 = "hello World";
         stanza4 = "next stanza";
     }
 
     void Update()
     {
         //start auto type
         SetText(stanza);
         //condition to change
         if(where == 1)
         {
             stanza = "";
             stanza = stanza2;
         }
         if(where == 2)
         {
             stanza = "";
             stanza = stanza3;
         }
         if(where == 3)
         {
             stanza = "";
             stanza = stanza4;
         }
 
     }
     
     IEnumerator TypeText () {
         foreach (char letter in stanza.ToCharArray()) {
             guiText.text += letter;
             yield return 0;
             yield return new WaitForSeconds (letterPause);
         }
         //new stanza condition
         where++;
         Debug.Log (where);
     }
     void SetText(string text)
     {
         //StopCoroutine("TypeText");
         stanza = text;
         guiText.text = "";
         StartCoroutine("TypeText");
     }
 }

As the title says, the text does not change to the next stanza.

Answer 1

this will work, but it's not very friendly with the garbage collector - string concatenation, foreach, etc. but i'm guessing that getting it working is the most important to you right now ;)

 using UnityEngine;
 using System.Collections;

  public class AutoType : MonoBehaviour
 {
     public float LetterPause = 0.1f;
 
     private bool _textFinished;
     private int _textIndex;
     private string[] _stanzas;
 
     public void Start()
     {
         _stanzas = new []{ "THIS IS IT", "new Message", "hello world", "next stanza", "you're welcome!" };
 
         _textFinished = true;
         _textIndex = -1;
     }
 
     public void Update()
     {
         if (_textFinished)
         {
             if (_textIndex++ >= (_stanzas.Length - 1))
             {
                 _textIndex = 0;
             }
 
             SetText(_stanzas[_textIndex]);
         }
     }
 
     private IEnumerator TypeText(float waitTime, string text)
     {
         _textFinished = false;
 
         guiText.text = "";
 
         foreach (var letter in text)
         {
             guiText.text += letter;
 
             yield return new WaitForSeconds (waitTime);
         }
 
         _textFinished = true;
     }
 
     private void SetText(string text)
     {
         StartCoroutine(TypeText(LetterPause, text));
     }
 
     public void OnGUI()
     {
         GUI.Label(new Rect(10, 10, 150, 100), "Text:" + guiText.text);
     }
 }

Auto-type text does not change to the next sentence

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