Why is my code working?

[Stoltverd]

So in the video, the answer to the challenge about changing the text when an incorrect answer is given was:

correctAnswerIndex = question.GetCorrectAnswerIndex();
string correctAnswer = question.GetAnswer(correctAnswerIndex);
questionText.text = correctAnswer;

However, since there was already a class variable called correctAnswerIndex, I had:

questionText.text = question.GetAnswer(correctAnswerIndex);

It worked!!!
And after thinking, I can’t understand why!!!
correctAnswerIndex should be 0 every time because I’m not initializing it!
I’m not feeding it the data from the SO. But I tested by changing the SO data and it worked!!! HOW???

[bixarrio]

Without seeing the code, it would be quite difficult to say. Show us the class and we might be able to tell you

[Stoltverd]

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;
using UnityEngine.UI;

public class Quiz : MonoBehaviour
{
    [SerializeField] TextMeshProUGUI questionText;
    [SerializeField] QuestionSO question;
    [SerializeField] GameObject[] answerButtons;
    int correctAnswerIndex;
    [SerializeField] Sprite defaultAnswerSprite;
    [SerializeField] Sprite correctAnswerSprite;
    void Start()
    {
        questionText.text = question.GetQuestion();

        for(int i = 0;  i < answerButtons.Length; i++)
        {
            TextMeshProUGUI buttonText = answerButtons[i].GetComponentInChildren<TextMeshProUGUI>();
            buttonText.text = question.GetAnswer(i);
        }

    }

    public void OnAnswerSelected(int index)
    {
        Image buttonImage;
        if (index == question.GetCorrectAnswerIndex())
        {
            questionText.text = "Correct!";
            buttonImage = answerButtons[index].GetComponent<Image>();
            buttonImage.sprite = correctAnswerSprite;
        }
        else
        {
            //questionText.text = question.GetAnswer(correctAnswerIndex); This WORKS, but I'm commenting it to match the course
            correctAnswerIndex = question.GetCorrectAnswerIndex();//Part of the changes added by the course, the "correct way" to do it.
            string correctAnswer = question.GetAnswer(correctAnswerIndex);//Part of the changes added by the course, the "correct way" to do it.
            questionText.text = "Sorry, the correct answer was;\n" + correctAnswer;//Part of the changes added by the course, the "correct way" to do it.

            buttonImage = answerButtons[correctAnswerIndex].GetComponent<Image>();
            buttonImage.sprite = correctAnswerSprite;
        }
    }
}

[bixarrio]

Hmmm, yes. That would only work if the correct answer was always at index 0.

[Stoltverd]

Thank you!