title: Best way to replace key of array in JavaScript?
body: <p>This is my array:</p>
  
  <pre><code>data = [{"src": 'a'},
          {'src': 'b'},
          {'src': 'c'}];
  </code></pre>
  
  <p>But I want to change key like this:</p>
  
  <pre><code>data = [{"letter": 'a'},
          {'letter': 'b'},
          {'letter': 'c'}];
  </code></pre>