title: Where can I find the "math, strings, etc... libraries" for Swift?
body: <p>I am looking at the Swift documentation, but I can't find reference to what there's in other languages...</p>
  
  <p>Examples: <code>sin()</code>, <code>cos()</code>, <code>abs()</code> for math, <code>uppercase()</code>, <code>lowercase()</code> for strings, <code>sort()</code>, <code>pop()</code>, <code>push()</code> for arrays etc...</p>
  
  <p>For strings I've found this <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/StringsAndCharacters.html#//apple_ref/doc/uid/TP40014097-CH7-XID_368">in the docs</a>:</p>
  
  <blockquote>
    <p>Swift’s String type is bridged seamlessly to Foundation’s NSString
    class. If you are working with the Foundation framework in Cocoa or
    Cocoa Touch, the entire NSString API is available to call on any
    String value you create, in addition to the String features described
    in this chapter. You can also use a String value with any API that
    requires an NSString instance.</p>
  </blockquote>
  
  <p>Could you point me to some doc or where can I find those functions listed?</p>