Swift JSON / Rx utils

JSON+Util.swift

import RxSwift

public protocol StringProtocol {}
extension String : StringProtocol {}

public typealias JSON = [String : AnyObject]

extension ObservableType where Self.E == Any? {
    
    public func mapToJSON() -> RxSwift.Observable<JSON> {
        return self.map { $0 as! JSON }
    }
}

extension Dictionary where Key : StringProtocol, Value : AnyObject {
    
    public func val<T>(_ type : T.Type, _ path : String, _ converter : ((AnyObject) -> T?)? = nil) -> T? {
        
        let components = path.components(separatedBy: ".")
        if components.isEmpty { return nil }
        
        let selfDict = (self as AnyObject) as? JSON
        if components.count == 1 {
            let raw : AnyObject? = selfDict?[components[0]]
            if raw == nil || converter == nil { return raw as? T }
            return converter!(raw!)
        }
        
        let nextDict = selfDict?[components[0]] as? JSON
        return nextDict?.val(type, components
            .suffix(from: 1)
            .joined(separator: "."))
    }
}

well my formatting got all screwed up, but you can use guard statements instead of nil checking.

guard let raw =  selfDict?[components[0]], let converter = converter else { return raw as? T }
return converter(raw)