title: array.includes(element) is giving false only in Angular 8(typescript)
body: <p>I am having an array as :</p>
  <pre><code>const ELEMENT_DATA: any[] =[
        {first:'1001', second:'john', third:'India'}, 
        {first:'1002', second:'Mack', third:'US'}]
  </code></pre>
  <p>Now, I want to check if my array is having an element named &quot;first&quot; or not. simply I want to get the names of elements only or just want to check if my array contains the required element or not in angular 8.</p>
  <p>I have tried everything like <code>array.includes(arr)</code>, <code>array.find(arr=&gt;....)</code>, <code>array.some(...)</code> etc. But for everything it's giving false value only. even if the element is present then also it's giving false only.</p>