title: Swift equivalent of Array.componentsJoinedByString?
body: <p>In Objective-C we can call <code>componentsJoinedByString</code> to produce a string with each element of the array separated by the supplied string. While Swift has a <code>componentsSeparatedByString</code> method on String, there doesn't appear to be the inverse of this on Array:</p>
  
  <pre><code>'Array&lt;String&gt;' does not have a member named 'componentsJoinedByString'
  </code></pre>
  
  <p>What is the inverse of <code>componentsSeparatedByString</code> in Swift?</p>