Question Call function only once in Coroutine

Hey, I am pretty new to Unity and all, I've been playing around with it in school for last 2-3 weeks.
I am creating a game that spawns enemies and counts your score for every enemy killed. I am using a coroutine to spawn the enemies, but now I wanted to change the amount of enemies spawned per second, after you killed a few of them. Problem is if I try to use the line "
ScoreManager testScore = GameObject.Find("Scores").GetComponent<ScoreManager>(); "
it calls it infinite amount of times and it eats up my ram until I go into Task Manager and turn it off.
So the question I have is how can I call the ScoreManager line only once?

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class SpawnManager : MonoBehaviour
6. {
7.     [SerializeField]
8.     private GameObject _enemyPrefab;
9.     void Start()
10.    
11.     {
12.         StartCoroutine(SpawnRoutine());
13.     }
14.  
15.    
16.     private IEnumerator SpawnRoutine()
17.     {
18.         while (true)
19.         {
20.             float randomX = Random.Range(-21f, 21f);
21.             Instantiate(_enemyPrefab, new Vector3(randomX, 15f, 0),
22.                 Quaternion.identity);
23.             ScoreManager testScore = GameObject.Find("Scores").GetComponent<ScoreManager>();
24.             if ((testScore.score > 0) && (testScore.score < 10))
25.             {
26.             yield return new WaitForSeconds(1.5f);
27.             }
28.             if ((testScore.score > 10) && (testScore.score < 20))
29.             {
30.             yield return new WaitForSeconds(1f);
31.             }

 

Find your object/component once and cache it from the

Start

method:

Code (CSharp):

1. private ScoreManager _testScore;
2.  
3. void Start()
4. {
5.   _testScore = GameObject.Find("Scores").GetComponent<ScoreManager>();
6. }

Or even better, ditch

GameObject.Find

and just expose

_testScore

in the inspector, then drag/drop the reference to it.

 

You probably have a case of an infinite loop.
It seems you do not have a

yield return

instruction if your test score is 0, 10, or 20 and above. You need to make sure that a

yield return

instruction is executed in every single iteration of the loop.