title: Access a char in a string, Swift 3.x
body: <p>I can not find documentation on Apple's developer site. I have also been searching for the past few hours without a well-explained answer. I am trying to learn swift currently and I am trying to access a nth char in a string. In c++ I know you can do this with str[int value] ie. </p>
  
  <p><code>string str = "This is a test string";
  cout &lt;&lt; str[2] &lt;&lt; endl;</code> </p>
  
  <p>should print out "i" if I counted right. I am trying to do/find a way to do this in Swift and have not found an easy or way to do this. Is anyone able to help give some input?</p>