How to generate prefabs of the random map one by one

Apologies in advance if the question seems silly as I am a very new Unity user.
This is the code for the random generation of the map i am working with

Code (CSharp):

1. public class LevelGeneration : MonoBehaviour
2.     {
3.         public GameObject[] objArray;
4.         void Start()
5.         {
6.             //generate a random object from our array (of prefabs of sprites) using this variable
7.             int ranNumBwZeroAndArrayLen = Random.Range(0, objArray.Length);
8.             //Instantiate gets the object that has the index equal to the random variable
9.             //the second parameter is the location of the new object
10.             //the third means the object wil be generated with no rotation
11.             Instantiate(objArray[ranNumBwZeroAndArrayLen], transform.position, Quaternion.identity);
12.  
13.         }
14.     }

which produces a random map as such



Just as the pictures above, different combinations will be produced.
My question is: how can I modify the code/project to make sure that this random sequence is displayed one by one?
Any suggestion will be much appreciated!

 

You can use a coroutine and wait some time before spawning the next part.
https://docs.unity3d.com/ScriptReference/Coroutine.html

 

Thank you!
The problem seems to be now that I realized that Instantiate() in my code

Code (CSharp):

1.             Instantiate(objArray[ranNumBwZeroAndArrayLen], transform.position, Quaternion.identity);
2.  

is actually looping the objArray that has the prefabs.
How do I manually do this loop with each element of the array showing one by one so that I can insert the coroutine method in it?
Or, how do I loop the Instantiate() inside the coroutine method?
I couldn't find anything to learn the connection between Instantate() and coroutines used together yet

 

Code (CSharp):

1. IEnumerator Example() {
2.    WaitForSeconds wait = new WaitForSeconds(1f);
3.  
4.    for(int i = 0; i < yourArray.Length; i++) {
5.       Instantate(yourArray[i]);
6.       yield return wait;
7.    }
8. }

The above example will instantiate every object in an array on a 1-second delay between each loop.
You can change the parameter in the

WaitForSeconds

constructor to increase/decrease the delay.

 

thank you so much!!