ARTICLE Function Composing Swift 2.0 - 3

article-function-composing-3.swift

// Function might throw errors like this:
func parseJSONFromNSData(data: NSData) throws -> JSON {
    // Try to parse but fails ...
    throw JSONParseError.InvalideJSON
}

func handleResponse<T : Unmarshallable>(data: NSDate) -> T {

    let data = ("{'somejson':true'}" as NSString).dataUsingEncoding(NSUTF8StringEncoding)!
    
    do {
        let json            = try parseJSONFromNSData(data)
        let validatedJSON   = try validateJSONResponse(json)
        let model           = try unmarshalJSON(validatedJSON, type: Model.self)
        return model
    } catch JSONParseError.InvalideJSON {
        print("Your JSON looks unreal")
    } catch ServerResponseError.ErrorResponse {
        print("Server didn't like your request")
    } catch let error {
        print("Seriosly unknown error: \(error)")
    }
    
}