Compare Enum with Associated Value Short Syntax

Question

I'm trying to simplify

var isReachable = {
    switch status {
    case .reachable: return true
    default: return false
    }
}()

to something like

var isReachable = (case status == .reachable)

Here is the full example:

enum NetworkReachabilityStatus {
    case unknown
    case notReachable
    case reachable(Alamofire.NetworkReachabilityManager.ConnectionType)
}

NetworkReachabilityManager().listener = { status in
    var isReachable = {
        switch status {
        case .reachable: return true
        default: return false
        }
    }()
}

This is only an issue when you are dealing with enums with associated values. Any suggestions?

Hardly simpler, but this is the best I could do: var isReachable: Bool = { if case .reachable = status { return true }; return false }() — vacawama
– vacawama, Commented Nov 15, 2016 at 22:50

kevin · Accepted Answer · 2016-11-16 01:09:29Z

2

An extension on NetworkReachabilityStatus can make this work.

extension NetworkReachabilityStatus {
    var isReachable: Bool {
        switch self {
            case .reachable(_): return true
            default: return false
        }
    }
}

NetworkReachabilityManager().listener = { status in
    var isReachable = status.isReachable
}

answered Nov 16, 2016 at 1:09

kevin

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Comments

PDK · Accepted Answer · 2016-11-16 21:29:49Z

0

(Since your full example doesn't do anything) If your motivation for this question is that you only want to perform some operation when the listener is called with "reachable" (similar to a completion being called with success: Bool), you can write:

NetworkReachabilityManager().listener = { status in
    if case .reachable(_) = status {
       // perform some operation
    }
}

If you wouldn't be satisfied with the readability—Yoda condition anyone?—you could combine it with kkoltzau's answer, which would allow you to write:

NetworkReachabilityManager().listener = { status in
    if status.isReachable {
       // perform some operation
    }
}

answered Nov 16, 2016 at 21:29

PDK

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1 Comment

efremidze Over a year ago

this was only an example, the full implementation looks different. I was just trying to ask a swift 3 related question about enums with associated values and equality.

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