title: How to add nil into Array?
body: <p>I'd like to add nil into Array,set as answersBody.</p>
  
  <pre><code>var answersBody = [String]()
  </code></pre>
  
  <p>When answer_body is nil, it returns error.Could you tell me how to solve the problem?</p>
  
  <pre><code>  Alamofire.request(.GET, "http://localhost:3000/api/v1/questions/index",parameters: nil, encoding: .JSON)
          .responseJSON { (request, response, data, error) in
              var jsonObj = JSON(data!)
              var questions_count = jsonObj["questions"].count
  
              for var index = 0; index &lt; questions_count; index++ {
                  let answer_body = jsonObj["questions"][index]["answers"]["body"].string
                  self.answersBody.append(answer_body!)
              }
              self.tableView.reloadData()
      }
  </code></pre>