 <p>Try this:</p> <p>It was initial created.</p> <pre><code>let string : String = "danial" let characters = Array(string) println(characters) //["d","a","n","i","a","l"] </code></pre> <p>String conforms to the <code>SequenceType</code> protocol, and its sequence generator enumerates the characters.</p> <p><strong>Swift 2</strong>, String does no longer conform to <code>SequenceType</code>, but the characters property provides a sequence of the Unicode characters:</p> <pre><code>let string = "danial" let characters = Array(string.characters) print(characters) //["d","a","n","i","a","l"] </code></pre>