title: Searching array key with reserved keyword
body: <p>I have created array as below</p>
  <p><code>[&quot;lists&quot;, { &quot;getByTitle&quot;: &quot;CardOperation&quot; }, &quot;items&quot;, { &quot;filter&quot;: &quot;Id eq 1&quot; }, { &quot;select&quot;: [&quot;Title&quot;, &quot;CustomerAge&quot;] }];</code></p>
  <p>Now one key as <strong>filter</strong> I want find it to know it is exists in array but as it is reserved keyword i cannot search it</p>
  <p>I tired</p>
  <pre><code>array.filter //not working
  
  array[&quot;filter&quot;] // not working
  </code></pre>
  <p>what should i do in this case, I am trying to find out if the array has an object with a key of filter at any index</p>