Is there a Swift Array equivalent for NSArray.arrayByAddingObjectsFromArray()?
<p>I would like to gain a new array by appending elements to an existing array without modifying it. <code>NSArray</code> has <code>arrayByAddingObjectsFromArray()</code>, e.g.:</p>

<pre><code>let numbers = (["one", "two", "three"] as NSArray).arrayByAddingObjectsFromArray(["four", "five"]) as! [String]
</code></pre>

<p>Is there an equivalent for Swift's <code>Array</code> struct that would make bridging to <code>NSArray</code> unnecessary?</p>