pipeHolders = GameObject.FindGameObjectsWithTag (“PipeHolder”);
pipeHolders = pipeHolders.OrderBy (pipeHolder => pipeHolder.transform.position.x).ToArray();

*****
public List points = new List();
****
List colors = new List();
colors.Add(“Red”);
colors.Add(“Blue”);
colors.Add(“Green”);

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http://answers.unity3d.com/questions/1112497/adding-gameobjects-to-an-existing-array.html

http://csharp.net-informations.com/collection/list.htm