Parsing parallel arrays of the Wikipedia API with Codable

WikiParser_playground.swift

import Foundation

struct WikipediaEntry {
    let title: String
    let summary: String
    let link: URL?
}

struct WikipediaSearchResults: Decodable {
    let term: String
    let entries: [WikipediaEntry]

    init(from decoder: Decoder) throws {
        var uc = try decoder.unkeyedContainer()

        self.term = try uc.decode(String.self)

        let titles = try uc.decode([String].self)
        let summaries = try uc.decode([String].self)
        let urls = try uc.decode([String].self)
            .map { URL(string: $0 )}

        entries = zip(zip(titles, summaries), urls)
            .map { WikipediaEntry(title: $0.0.0, summary: $0.0.1, link: $0.1) }

    }
}

URLSession.shared.dataTask(with: URL(string: "https://en.wikipedia.org/w/api.php?action=opensearch&search=Man&format=json")!) { data, resp, error in
    guard let data = data else {
        return
    }

    let decoder = JSONDecoder()
    let results = try? decoder.decode(WikipediaSearchResults.self, from: data)

    print(results)
}.resume()