Comparing struct values which are inside class - swift

Question

I've class and inside of a class got struct GoalsDifference, in that struct there are two propertys: scoredGoal and passedGoal which's value is passed by me.
I've declared two variables with this class and struct and put them in array.
Now I want to get into the array and compare the first variable's scoredGoal to the other one ( as well as passedGoals to each other )
class Team: Base {
var goalsDifference: GoalsDifference?
override init(name:String){
super.init(name: name)
}
convenience init(name:String, goalsDifference:GoalsDifference){
self.init(name:name)
self.goalsDifference = goalsDifference
}
struct GoalsDifference {
var scoredGoal:Int
var passedGoal:Int
}
}
var team1 = Team(name:"Team one", goalsDifference: .init(scoredGoal: 3, passedGoal: 5))
var team2 = Team(name:"Team two", goalsDifference: .init(scoredGoal: 3, passedGoal: 2))
var twoTeams = [team1,team2]
I tried to do it with .filter method but it returns an error : Contextual closure type '(Team) throws -> Bool' expects 1 argument, but 2 were used in closure body
twoTeams[0..<teamsCount].filter { $0.goalsDifference?.scoredGoal ?? "" > $1.goalsDifference?.scoredGoal ?? ""}

Answer 1

This gets a little cumbersome since goalDifference is optional but here is a solution with a function that compares self with another team. I assume that this is sports related and that goals always start at 0.
extension Team {
private static let emptyGoalsDifferenc = GoalsDifference(scoredGoal: .zero, passedGoal: .zero)
func best(goals: KeyPath<GoalsDifference, Int>, comparing other: Team) -> Team? {
let ownDifference = self.goalsDifference ?? Self.emptyGoalsDifferenc
let otherDifference = other.goalsDifference ?? Self.emptyGoalsDifferenc
let ownGoals = ownDifference[keyPath: goals]
let otherGoals = otherDifference[keyPath: goals]
if ownGoals == otherGoals { return nil }
return ownGoals > otherGoals ? self : other
}
}
Example
var team1 = Team(name:"Team one", goalsDifference: .init(scoredGoal: 3, passedGoal: 5))
var team2 = Team(name:"Team two", goalsDifference: .init(scoredGoal: 3, passedGoal: 2))
let bestScored = team1.best(goals: \.scoredGoal, comparing: team2)
let bestPassed = team1.best(goals: \.passedGoal, comparing: team2)