Modify object using jQuery.map?
<p>I have a key-value pair like</p>

<p><code>var classes = { red: 'Red', green: 'Green' };</code></p>

<p>How can I prepend each of the keys with a specific value? Could this be done using jQuery.map?</p>

<p>The final result I'm looking for is</p>

<p><code>classes = { 'a-red': 'Red', 'a-green': 'Green' };</code></p>
