Coroutine chaining in Unity - Mini Project: Build & Apply

Coroutine chaining

📖 Scenario: You are creating a simple Unity game where you want to show messages one after another with delays in between. You will use coroutines to chain these messages smoothly.

🎯 Goal: Build a Unity script that uses coroutine chaining to display three messages in order, each after a delay.

📋 What You'll Learn

Create a coroutine that shows a message and waits for 1 second

Chain three coroutines so messages appear one after another

Use StartCoroutine and yield return properly

Print messages to the Unity Console

💡 Why This Matters

🌍 Real World

In games, you often want to show instructions, dialogues, or animations one after another with delays. Coroutine chaining helps you do this easily.

💼 Career

Understanding coroutine chaining is important for Unity developers to create smooth gameplay sequences and timed events.

1

Create the first coroutine to show a message

Create a coroutine method called ShowMessageOne that prints "Message One" to the console and then waits for 1 second using yield return new WaitForSeconds(1f).

Unity

using UnityEngine;
using System.Collections;

public class MessageChain : MonoBehaviour
{
    // Create coroutine ShowMessageOne here
    // Your code here
}

Need a hint?

Remember, a coroutine method returns IEnumerator and uses yield return to wait.

2

Create the second coroutine to show the next message

Add a coroutine method called ShowMessageTwo that prints "Message Two" and waits for 1 second using yield return new WaitForSeconds(1f).

Unity

using UnityEngine;
using System.Collections;

public class MessageChain : MonoBehaviour
{
    IEnumerator ShowMessageOne()
    {
        Debug.Log("Message One");
        yield return new WaitForSeconds(1f);
    }

    // Create coroutine ShowMessageTwo here
    // Your code here
}

Need a hint?

Follow the same pattern as ShowMessageOne but change the message text.

3

Create the third coroutine to show the final message

Add a coroutine method called ShowMessageThree that prints "Message Three" and waits for 1 second using yield return new WaitForSeconds(1f).

Unity

using UnityEngine;
using System.Collections;

public class MessageChain : MonoBehaviour
{
    IEnumerator ShowMessageOne()
    {
        Debug.Log("Message One");
        yield return new WaitForSeconds(1f);
    }

    IEnumerator ShowMessageTwo()
    {
        Debug.Log("Message Two");
        yield return new WaitForSeconds(1f);
    }

    // Create coroutine ShowMessageThree here
    // Your code here
}

Need a hint?

Use the same structure as the previous coroutines but print "Message Three".

4

Chain the coroutines to run one after another

Create a coroutine method called StartMessageChain that uses yield return StartCoroutine(ShowMessageOne()), then yield return StartCoroutine(ShowMessageTwo()), and finally yield return StartCoroutine(ShowMessageThree()). In the Start() method, start the StartMessageChain coroutine using StartCoroutine(StartMessageChain()).

Unity

using UnityEngine;
using System.Collections;

public class MessageChain : MonoBehaviour
{
    IEnumerator ShowMessageOne()
    {
        Debug.Log("Message One");
        yield return new WaitForSeconds(1f);
    }

    IEnumerator ShowMessageTwo()
    {
        Debug.Log("Message Two");
        yield return new WaitForSeconds(1f);
    }

    IEnumerator ShowMessageThree()
    {
        Debug.Log("Message Three");
        yield return new WaitForSeconds(1f);
    }

    // Create StartMessageChain coroutine and Start method
    // Your code here
}

Need a hint?

Use yield return StartCoroutine() to wait for each coroutine to finish before starting the next.

Start the chain in the Start() method.