Search function resusable

search.swift

func search (searchString: String, type: SearchType, completionHandler: (returnedArray: [AnyObject], errorDescription: String?) -> Void) {
        let searchReposURL = "https://api.github.com/search/repositories?q="
        let searchUsersURL = "https://api.github.com/search/users?q="
        let cleanedSearch = searchString.stringByReplacingOccurrencesOfString(" ", withString: "+", options: nil, range: nil)
        var url : NSURL?
        switch type {
        case .Repos:
            url = NSURL(string: (searchReposURL + cleanedSearch))?
        case .Users:
            url = NSURL(string: (searchUsersURL + cleanedSearch))?
        default:
            println("That is not a valid search type")
        }
        
        let task = self.networkSession!.dataTaskWithURL(url!, completionHandler: { (data, response, error) -> Void in
            if let httpResponse = response as? NSHTTPURLResponse {
                if error != nil {
                    // If there is an error in the web request, print to console
                    println(error.localizedDescription)
                }
                
                switch httpResponse.statusCode {
                case 200...299:
                    println("Success!!")
                    var returnedArray : [AnyObject]?
                    switch type {
                    case .Repos:
                        let returnedArray = Repo.parseJSONDataIntoRepos(data)
                    case .Users:
                        let returnedArray = User.parseJSONDataIntoUsers(data)
                    default:
                        println("Something bad happened")
                    }
                    NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
                        completionHandler(returnedArray: returnedArray!, errorDescription: nil)
                    })
                case 400...499:
                    println("error on the client")
                    println(httpResponse.description)
                    
                case 500...599:
                    println("error on the server")
                default:
                    println("something bad happened")
                }
            }
            else {
                println("Something bad happened")
            }
        })
        
        task.resume()
    }