title: Filter only few elements from an object by a specific key
body: <p>I'm working on something like this:</p>
  
  <p>my object looks like that:</p>
  
  <pre><code>{
    a: 1,
    b: 2,
    c: 3,
    game01: 1,
    game02: 2,
    game03: 3
  }
  </code></pre>
  
  <p>what I need to do is to return from it an object containing only last 3 pairs so it'd look like that:</p>
  
  <pre><code>{
    game01: 1,
    game02: 2,
    game03: 3
  }
  </code></pre>
  
  <p>I would prefer not to do that manually but it'd be the best to use a something similar as filtering an array. </p>
  
  <p>Thanks!</p>