title: Dictionary print key and value in Swift 4
body: <p>Hello I tried a print dictionary items at Xcode9. Like this:</p>
  
  <pre><code>var items = ["Bear":"0", "Glass":"1", "Car":"2"]
  
  for (key,value) in items{
  
  print("\(key) : \(value)")
  
  }
  </code></pre>
  
  <p>output: </p>
  
  <pre><code>Glass : 1
  Bear : 0
  Car : 2
  </code></pre>
  
  <p>Why output not like this: Bear: 0, Glass:1, Car:2 
  I dont understand this output reason.</p>