title: How to assign the value in a key to a constant name using Swift?
body: <p>Here's my code</p>
  
  <pre><code>let currencies = ["US": "Dollar", "UK": "Pound", "JP": "Yen"]
  </code></pre>
  
  <p>Now, from here, I'd like assign the value for key "UK" to a constant named ukCurrency.</p>