Binding to an Entire Sequence, How?

Question

I would like to know if ANY member of a sequence updates.
For example:
public class Subject {
    var students: Student[];
}Then I wanted to do an "all student" calculation, this if any are added or removed work do the calculation again).
public class AverageStudentScore {
    var subject: Subject;
    var student: bind getAverageStudentScore(subject.students);
    function getAverageStudentScore(s: Students[]):Number {
        .....do calculation here and return.
}The examples I have found online only show a sequence bound to a sequence and a var bound to an individual (known)

Answer 1

Hey dgreive.
Actually, my problem is a little more complex than I had anticipated. I will change the example so that it's a little easier to explain...
Each 'Person' exists in a sequence of 'people' and has a bound on replace listener hoping to discover friends amounst the 'people' as they are inserted.
public class SocialScene {
    public var people: Person[];
    init {
        insert Person{name:"Fred", socialScene: this, friends: ["Jane","Pete"]} into people
        insert Person{name:"Jane", socialScene: this, friends: ["Fred"]} into people       
        insert Person{name:"Pete", socialScene: this, friends: ["Fred"]} into people               
public class Person {
    public var name: String;
    public var friends: String[];
    public var socialScene: SocialScene;
    var people: Person[] = bind socialScene.people on replace {
        //do whatever you do with friends as they appear
}The real problem is that as a person is a bound listener on the people sequence. When the binding is fired (initially by a new person insert) for some reason the 'replace' bind firing then causes another 'replace' bind firing on sequence, and another bind on replace is fired. This results in more or less and infinite loop and I get a lovely stack overflow. Can a member of a sequence be a bound listener on the sequence it exists within? I guess I don't understand the rules here.