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Chapter 19 Mediator Pattern

I’m lost as to what the colleague’s computed property does in the Mediator wrapper class. It says in your book that is “uses a filter to find colleagues from colleagueWrappers that have already been released and then returns an array of non-nil colleagues”

What has been released though? For reference, I mean this computer property:

public var colleagues: [ColleagueType] {
	var colleagues: [ColleagueType] = []
	colleagueWrappers = colleagueWrappers.filter {
		guard let colleague = $0.colleague else { return false }
		colleagues.append(colleague)
		return true
	}
	return colleagues
}

An explanation as to what the colleague wrapper class does would be really helpful too, it doesn’t really explain in the book what its purpose is.