title: How can i filter a big Array of Arrays for a unique value?
body: <p>I have an Array of 241 items, which have many properties, and one of them, i need to check for duplicates and if they exist i want to retrieve them</p>
  
  <pre><code>[{
  0: { archived: false,
       codes: ["8051827900013"]},
  1: { archived: false
       codes: ["8051827900013", "8052333451"]}
  }]
  </code></pre>
  
  <p>i tried to map the array to retrieve only the codes but then how does i filter for duplicates?</p>
  
  <p>sorry for such a newbie question around here.</p>