Find children by tag from Player

Here's a project I wrote a while ago:

The cube is the "Player", the spheres are the item holders, and the cilinder is the GameObject that uses a script to get the children (I called it ChildFinder).

In case you need it, I wrote it both in C# and... Unity Script ;)

// JavaScript

 #pragma strict
 
 var _itemHoldersWithFor : ArrayList;
 var _itemHoldersWithForEach : ArrayList;
 var _player : GameObject;
 
 function Awake () {
     _player = GameObject.Find("Player");
     _itemHoldersWithFor = new ArrayList();
     _itemHoldersWithForEach = new ArrayList();
 }
 
 function PrintArrayList (name : String, array : ArrayList) {
     Debug.Log("ArrayList: "+name);
     for (item in array) {
         var gobj : GameObject = item as GameObject;
         Debug.Log("Child: "+gobj.name);
     }
     Debug.Log("***********");
 }
 
 function Start () {
     if (_player != null) {    
 
         var childrenTransforms : Transform[];
         childrenTransforms = _player.GetComponentsInChildren.<Transform>();
         
         // 1. 
 
         var childCount = childrenTransforms.Length;
         
         if (childrenTransforms != null) {
             for(var i = childCount - 1; i >= 0; i--) {
                 if (childrenTransforms[i].gameObject.tag == "ItemHolder")
                     _itemHoldersWithFor.Add(childrenTransforms[i].gameObject);
             }
         }
 
         PrintArrayList("ItemHolders with FOR", _itemHoldersWithFor);
         
         // 2.
         
         for (item in childrenTransforms) {
             var childTransform : Transform = item as Transform;
             if (childTransform != null && childTransform.gameObject.tag.Equals("ItemHolder"))
                 _itemHoldersWithForEach.Add(childTransform.gameObject);
         }
 
         PrintArrayList("ItemHolders with FOREACH", _itemHoldersWithForEach);
     }
 }
 
 function Update () {
 
 }

// C#

 using UnityEngine;
 using System.Collections;
 
 public class ChildFinder : MonoBehaviour {
 
     private ArrayList _itemHoldersWithFor;
     private ArrayList _itemHoldersWithForEach;
     private GameObject _player;
 
     void Awake () {
         _player = GameObject.Find("Player");
         _itemHoldersWithFor = new ArrayList();
         _itemHoldersWithForEach = new ArrayList();
     }
 
     void PrintArrayList (string name, ArrayList array) {
         Debug.Log("ArrayList: "+name);
         foreach (GameObject gobj in array) {
             Debug.Log("Child: "+gobj.name);
         }
         Debug.Log("***********");
     }
 
     // Use this for initialization
     void Start () {
         if (_player != null) {    
 
             Transform[] childrenTransforms = _player.GetComponentsInChildren<Transform>();
             
             // 1. 
 
             int childCount = childrenTransforms.Length;
             
             if (childrenTransforms != null) {
                 for(int i = childCount - 1; i >= 0; i--) {
                     if (childrenTransforms[i].gameObject.tag == "ItemHolder")
                         _itemHoldersWithFor.Add(childrenTransforms[i].gameObject);
                 }
             }
 
             PrintArrayList("ItemHolders with FOR", _itemHoldersWithFor);
             
             // 2.
             
             foreach (Transform childTransform in childrenTransforms) {
                 if (childTransform != null && childTransform.gameObject.tag.Equals("ItemHolder"))
                     _itemHoldersWithForEach.Add(childTransform.gameObject);
             }
 
             PrintArrayList("ItemHolders with FOREACH", _itemHoldersWithForEach);
         }
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 }
 

In both cases, the Start method has two parts: "1." and "2.". The former uses "for" and the other uses "foreach" (in JavaScript, the "for" keyword is used as well).

You may have noticed I added a function called "PrintArrayList". After I ran the program, it showed these results:

Both cases printed all the children's names.

There you have it. I hope this helps.

By the way, I read in this post that it's recommended to use "List" instead of "ArrayList", but I didn't have time to make the changes:

Unless you have something forcing you to use ArrayList you should use a List instead. ArrayList is only included in C# for backwards compatibility

If you need to use "List", this post might help (it's in C#, though)