struct ExtremeModel {
    var trick: String!
    var definition: String!
    var extremeSport: Sport!
    enum Sport {
        case bmx
        case skateboarding
        case snowboarding
    }
}
struct Sections {
    var sectionName: String!
    var Objects: [ExtremeModel]!
}

struct Data {
    static func allTricks() -> [Sections] {
        return [
            Sections(sectionName: "A", Objects: [
                ExtremeModel(trick: "Acid Drop", definition: "Lorem ipsum", extremeSport: .skateboarding),
                ExtremeModel(trick: "Axel Stall", definition: "Lorem ipsum", extremeSport: .skateboarding)
            ]),
            Sections(sectionName: "B", Objects: [
                ExtremeModel(trick: "Back Flip", definition: "Lorem ipsum", extremeSport: .snowboarding),
                ExtremeModel(trick: "Bar Spin", definition: "Lorem ipsum", extremeSport: .bmx),
                ExtremeModel(trick: "Bunny Hop", definition: "Lorem ipsum", extremeSport: .bmx)
            ]),
            Sections(sectionName: "S", Objects: [
                ExtremeModel(trick: "Shifty", definition: "Lorem ipsum", extremeSport: .snowboarding),
                ExtremeModel(trick: "Shuvit", definition: "Lorem ipsum", extremeSport: .skateboarding),
                ExtremeModel(trick: "Stalefish", definition: "Lorem ipsum", extremeSport: .snowboarding)
            ]),
        ]
    }
}

let allTerms = Data.allTricks()

// Here, I am filtering by Section Name. I want to filter by extremeSport, so I can update the view based on sports.
let filteredSports = allTerms.filter { (sport:Sections) -> Bool in
    return sport.sectionName == "A"
}