title: Javascript add same property to all objects in array
body: <p>I am working in node without angular or underscore and am looking for an efficient plain javascript answer (perhaps avoiding loops).  I have the following array of JSON objects:</p>
  
  <pre><code>object = [
      {account:2423, user:1564},
      {account:1235, user:1564}
  ]
  </code></pre>
  
  <p>I want to add the following to each array within the object:</p>
  
  <pre><code>username:"clientname" 
  </code></pre>
  
  <p>So that it looks like this in the end:</p>
  
  <pre><code>object = [
      {account:2423, user:1564, username:"clientname"},
      {account:1235, user:1564, username:"clientname"}
  ]
  </code></pre>
  
  <p>This question requests the avoidance of loops.</p>