Articles, podcasts and news about Swift development, by John Sundell.

Avoiding manual Codable implementations

Published on 16 Aug 2018
Basics article available: Codable

When I use Codable in Swift, I want to avoid manual implementations as much as possible, even when there's a mismatch between my code structure and the JSON I'm decoding.

One way that can often be achieved is to use private data containers combined with computed properties.

struct User: Codable {
    let name: String
    let age: Int

    var homeTown: String { return originPlace.name }

    private let originPlace: Place
}

private extension User {
    struct Place: Codable {
        let name: String
    }
}

extension User {
    struct Container: Codable {
        let user: User
    }
}

Support Swift by Sundell by checking out this sponsor:

RevenueCat

RevenueCat: Easily build and manage iOS and Android in-app purchases. With just a few lines of code RevenueCat provides IAP infrastructure, customer analytics, data integrations, and gives you time back from dealing with edge cases and updates across all platforms.