title: How to get certain part of object array as a new array?
body: <p>I have an Object array:</p>
  
  <pre><code>let products = [{ code: 'a', num: 1 }, { code: 'b', num: 2 }];
  </code></pre>
  
  <p>I want to get the <strong>codes</strong> array: <code>['a', 'b']</code>.</p>
  
  <p>This is how I am doing now using <strong>lodash</strong>:</p>
  
  <pre><code>let codes = [];
  _.forEach(products, (product) =&gt; {
    codes.push(product.code);
  });
  </code></pre>
  
  <p>Is there any smart way to do this?</p>