Scratch To Unity: Control

This post provides a handy reference guide to go from Scratch’s “Control” category of code blocks to C# with Unity.

Code Blocks
Click on the picture of any of these Scratch code blocks to see how to write similar code statements in C#.

IEnumerator Start()
{
// Optional code here
yield return new WaitForSeconds(1f);
// Optional code here
}

for (int i = 0; i < 10; ++i)
{
// Code to repeat
}

You can simply use the “Update” method of a “MonoBehaviour”:

void Update()
{
// Code to repeat per frame
}

Or, you can use a “while” loop. Make sure to provide some way to pause execution (like a yield statement in a Coroutine) or you will lock up Unity.

IEnumerator Start()
{
while(true)
{
// Optional code here
yield return null; // wait a frame
// Optional code here
}
}

// "condition" is anything that evaluates to true or false
if (condition)
{
// Code to execute when condition is true
}

// "condition" is anything that evaluates to true or false
if (condition)
{
// Code to execute when condition is true
}
else
{
// Code to execute when condition is false
}

// Optional code here
// "condition" is anything that evaluates to true or false
yield return new WaitUntil(() => condition);
// Optional code here

This is basically a “while” loop where you want the condition to be false:

// "condition" is anything that evaluates to true or false
while (!condition)
{
// Code to repeat
}

You can stop a script by disabling it.

enabled = false;

Or, if you were running a Coroutine you could stop it:

var coroutine = SomeCoroutine();
StartCoroutine(coroutine);
StopCoroutine(coroutine);

There isn’t a “good” equivalent for this, but a possible solution exists based on a pattern Unity has implemented. Whenever a clone is instantiated, the name of the clone will have “(Clone)” added to the end of its name. I only say it isn’t a “good” solution because you can rename an instantiated clone and then wouldn’t have any way to determine that status.

void Start()
{
if (name.Contains("Clone"))
{
Debug.Log("I'm a clone!");
}
}

Instantiate(gameObject);

Destroy(gameObject);

Summary
This should cover all of the code blocks in Scratch’s “Control” category. If you have any questions about this reference guide feel free to ask below.
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