URLSession + Combine

ViewController.swift

import UIKit
import Combine
import PlaygroundSupport

let label = UILabel(frame: .init(origin: .zero, size: CGSize(width: 100, height: 100)))
let url = URL(string: "https://api.mocki.io/v1/aebff128")!
var cancellables = Set<AnyCancellable>()

URLSession
  .shared
  .dataTaskPublisher(for: url) // 1
  .map(\.data) // 2
  .decode(type: [String: [String]].self, decoder: JSONDecoder()) // 3
  .compactMap(\.["results"]) // 4
  .replaceError(with: []) // 5
  .map { $0.joined(separator: " ") } 
  .receive(on: DispatchQueue.main) // 6
  .assign(to: \.text, on: label) // 7
  .store(in: &cancellables) // 8

PlaygroundSupport.PlaygroundPage.current.liveView = label