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typealias JSON = AnyObject

protocol JSONParsable {
    init(json: JSON)
}

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extension Profile:JSONParsable {
    init(json: JSON) {
        if let id:Int = json["id"] as? Int {
            identifier = id
        }
        if let n:String = json["name"] as? String {
            name = n
        }
    }
}

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struct Profile {
    var identifier = 0
    var name = ""
}

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infix operator <-- {}
func <-- <T>(inout left: T, right: AnyObject?) {
    if let v: T = right as? T {
        left = v
    }
}

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extension Profile:JSONParsable {
    init(json: JSON) {
        identifier <-- json["id"]
        name <-- json["name"]
    }
}

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func <-- <T>(inout left: T?, right: AnyObject?) {
    if let v: T = right as? T {
        left = v
    }
}

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infix operator <== {}
func <== <T:JSONParsable>(inout left:T, right: AnyObject?) {
    if let r: AnyObject = right {
        left = T.self(json:r)
    }
}

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extension Stats:JSONParsable {
    init(json: JSON) {
        numberOfFollowers <-- json["numberOfFollowers"]
        numberOfFollowing <-- json["numberOfFollowing"]
    }
}

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extension Profile:JSONParsable {
    init(json: JSON) {
        identifier <-- json["id"]
        name <-- json["name"]
        stats <== json["stats"]
    }
}

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{
    "id": 15678,
    "name": "John Doe",
    "stats": {
        "numberOfFollowers": 163,
        "numberOfFollowing": 10987
    }
}