title: How to merge two object data become one
body: <p>I two data need to merge become one. My example data like this..</p>
  
  <p><strong>First data</strong></p>
  
  <pre><code>{Address: "Test", City: "test", State: "Test"}
  </code></pre>
  
  <p><strong>Second Data</strong></p>
  
  <pre><code>{UserId:"John", Name: "John"}
  </code></pre>
  
  <p>When I use this method <code>const a = [].concat(this.firstData, this.secondData);</code> it become in array not combine become one, example like bellow:</p>
  
  <pre><code>(2)[{…}, {…}]
  
  [0]{Address: "Test", City: "test", State: "Test", …}
  [1]{UserId:"John", Name: "John", …}
  </code></pre>
  
  <p>What method should I use to merge become one</p>