title: how to get the value of the only key-value pair in object
body: <p>I have a javascript object like below, <strong><code>a</code> has only one key-value pair</strong>, how could I get the value of a1 <strong>without using iteration</strong> and also without knowing the key name(i.e a1) ?</p>
  
  <pre><code>a: {
              a1:"hello"
          }
  </code></pre>