title: Comparing 2 observable array object values and returning the filtered observable
body: <p>need a little help her with observables again. I had 2 observables with the respective data structures below.</p>
  <p>Observable 1</p>
  <pre><code>[{application: &quot;&quot;, dateCreated: &quot;&quot;,dateUpdated: &quot;&quot;,id: &quot;&quot;,module: &quot;&quot;,resource:&quot;&quot;}, {application: &quot;&quot;, dateCreated: &quot;&quot;,dateUpdated: &quot;&quot;,id: &quot;&quot;,module: &quot;&quot;,resource:&quot;&quot;}, ...]
  </code></pre>
  <p>Observable 2</p>
  <pre><code>{status: XXX, data: [{Id: '', userId: '', permissionId: '', projectId: '', priority: 0, …}]}
  </code></pre>
  <p>How do i compare the item of observable 1 <strong>Id</strong> with observable 2 <strong>permissionId</strong>? And if both ids tally, how do i also return with a <strong>new object property called &quot;checked:true&quot;</strong> inside the first observable? Much help appreciated. Thanks.</p>