title: Using Lodash `_.get` to access object key using bracket notation
body: <p>I have the following</p>
  
  <pre><code>const key = 'foo';
  const test = { foo: { bar: 23 } };
  </code></pre>
  
  <p>and I'd like to use lodash <code>get</code> to access the value of <code>test[key].bar</code>.</p>
  
  <p>I want to use the bracket notation on the first indicator...</p>
  
  <pre><code>_.get(test, '[key].bar'); // results in undefined
  </code></pre>
  
  <p>Surely there's a way...</p>