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Question by beagrie83 · Jan 02, 2017 at 02:14 AM · listsindexcustom class

Custom Class List - Passing the Class Vs Passing an Index

Hi,

I'm currently working on something using Lists and custom classes. I was just curious if it is better to pass the class itself over to the various functions, or pass the index in the list. Or is there another better way I haven't seen yet?

Here's an example of what I mean.

 public List<CustomClass> customClass;
 
 void Start() {
 
 editListItem (customClass[3]);
 
 }
 
 void editListItem (CustomClass cc) {
 
 // do stuff with cc.
 
 }

Vs. doing it like this

 public List<CustomClass> customClass;
 
 void Start() {
 
 editListItem (3);
 
 }
 
 void editListItem (int ccIndex) {
 
 // do stuff with customClass[ccIndex].
 
 }

I've used both and both work, but is one better than the other and why? The only obvious pro/con I can see is that passing an index can start to get a bit much when you're dealing with nested lists and the call to your list item can be 3 pages wide!

I have no knowledge of memory handling in Unity beyond beginner level, but I always intuitively felt that passing a whole class might be bad from an efficiency standpoint. Am I way off?

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avatar image TBruce · Jan 02, 2017 at 02:44 AM 0
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I would personally do the latter like so

 public List<CustomClass> customClass;
 
 void Start() {
     editListItem (3);
 }
 
 void editListItem (int ccIndex) {
     if ((ccIndex < customClass.Count) && (customClass[ccIndex] != null))
     {
         // do stuff with customClass[ccIndex]
     }
 }

But like you said either way works.

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