title: Decoding a JSON without keys in Swift 4
body: <p>I'm using an API that returns this pretty horrible JSON:</p>
  
  <pre><code>[
    "A string",
    [
      "A string",
      "A string",
      "A string",
      "A string",
      …
    ]
  ]
  </code></pre>
  
  <p>I'm trying to decode the nested array using JSONDecoder, but it doesn't have a single key and I really don't know where to start… Do you have any idea?</p>
  
  <p>Thanks a lot!</p>