Loops

Checked with version: 4

-

Difficulty: Beginner

How to use the For, While, Do-While, and For Each Loops to repeat actions in code.

Loops

Beginner Scripting

ForLoop

Code snippet

using UnityEngine;
using System.Collections;

public class ForLoop : MonoBehaviour
{
    int numEnemies = 3;
    
    
    void Start ()
    {
        for(int i = 0; i < numEnemies; i++)
        {
            Debug.Log("Creating enemy number: " + i);
        }
    }
}
#pragma strict

var numEnemies : int = 3;


function Start ()
{
    for(var i : int = 0; i < numEnemies; i++)
    {
        Debug.Log("Creating enemy number: " + i);
    }
}
import UnityEngine
import System.Collections


public class ForLoop(MonoBehaviour):

    private numEnemies = 3

    
    
    private def Start():
        for i in range(0, numEnemies):
            Debug.Log(('Creating enemy number: ' + i))

WhileLoop

Code snippet

using UnityEngine;
using System.Collections;

public class WhileLoop : MonoBehaviour
{
    int cupsInTheSink = 4;
    
    
    void Start ()
    {
        while(cupsInTheSink > 0)
        {
            Debug.Log ("I've washed a cup!");
            cupsInTheSink--;
        }
    }
}
#pragma strict

var cupsInTheSink : int = 4;


function Start ()
{
    while(cupsInTheSink > 0)
    {
        Debug.Log ("I've washed a cup!");
        cupsInTheSink--;
    }
}
import UnityEngine
import System.Collections


public class WhileLoop(MonoBehaviour):

    private cupsInTheSink = 4

    
    
    private def Start():
        while cupsInTheSink > 0:
            Debug.Log('I\'ve washed a cup!')
            cupsInTheSink -= 1

DoWhileLoop

Code snippet

using UnityEngine;
using System.Collections;

public class DoWhileLoop : MonoBehaviour 
{
    void Start()
    {
        bool shouldContinue = false;
        
        do
        {
            print ("Hello World");
            
        }while(shouldContinue == true);
    }
}
#pragma strict

function Start()
{
    var shouldContinue : Boolean = false;
        
    do
    {
        print ("Hello World");
            
    }while(shouldContinue == true);
}
import UnityEngine
import System.Collections


public class DoWhileLoop(MonoBehaviour):

    private def Start():
        shouldContinue = false
        
        while true:
            print('Hello World')
            break  unless (shouldContinue == true)

ForeachLoop

Code snippet

using UnityEngine;
using System.Collections;

public class ForeachLoop : MonoBehaviour 
{   
    void Start () 
    {
        string[] strings = new string[3];
        
        strings[0] = "First string";
        strings[1] = "Second string";
        strings[2] = "Third string";
        
        foreach(string item in strings)
        {
            print (item);
        }
    }
}
#pragma strict

function Start () 
{
    var strings = ["First string", "Second string", "Third string"];
    
    for(var item : String in strings)
    {
        print (item);
    }
}
import UnityEngine
import System.Collections


public class ForeachLoop(MonoBehaviour):

    private def Start():
        strings as (string) = array(string, 3)
        
        strings[0] = 'First string'
        strings[1] = 'Second string'
        strings[2] = 'Third string'
        
        for item as string in strings:
            print(item)
IF Statements
Scope and Access Modifiers

Related tutorials

Scripting

Beginner Gameplay Scripting

  1. Scripts as Behaviour Components
  2. Variables and Functions
  3. Conventions and Syntax
  4. C# vs JS syntax
  5. IF Statements
  6. Loops
  7. Scope and Access Modifiers
  8. Awake and Start
  9. Update and FixedUpdate
  10. Vector Maths
  11. Enabling and Disabling Components
  12. Activating GameObjects
  13. Translate and Rotate
  14. Look At
  15. Linear Interpolation
  16. Destroy
  17. GetButton and GetKey
  18. GetAxis
  19. OnMouseDown
  20. GetComponent
  21. Delta Time
  22. Data Types
  23. Classes
  24. Instantiate
  25. Arrays
  26. Invoke
  27. Enumerations
  28. Switch Statements

Intermediate Gameplay Scripting

  1. Properties
  2. Ternary Operator
  3. Statics
  4. Method Overloading
  5. Generics
  6. Inheritance
  7. Polymorphism
  8. Member Hiding
  9. Overriding
  10. Interfaces
  11. Extension Methods
  12. Namespaces
  13. Lists and Dictionaries
  14. Coroutines
  15. Quaternions
  16. Delegates
  17. Attributes
  18. Events

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