Duplicate elements of array in the same array : <p>I got this array of objects</p>

<pre><code>let item = [
  { a: 1 },
  { b: 2 }
]
</code></pre>

<p>and would like to duplicate array's elements to the same array. Output should be:</p>

<pre><code>[
  { a: 1 },
  { b: 2 },
  { a: 1 },
  { b: 2 }
] 
</code></pre>

<p>Can you help?</p>
