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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<script src="https://cdn.rawgit.com/lodash/lodash/4.5.1/dist/lodash.min.js"></script>
  <script>
  
  
  
  </script>
</body>
</html>
 
const api = [
    {
        "id": 1,
        "name": "John Coltrane",
        "albums": [
            { "title": "Giant Steps" },
            { "title": "A Love Supreme"},
            { "title": "Tenor Madness"}
        ],
        "instrument": "Saxophone"
    },
    {
        "id": 2,
        "name": "Sonny Rollins",
        "albums": [
            { "title": "Saxophone Colossus" },
            { "title": "The Bridge"},
            { "title": "Tenor Madness"}
        ],
        "instrument": "Saxophone"
    }
];
    
  const ret =  _(api)
    .map(x=>x.albums)
     .flatten()
    .map(x=>x.title)
     .uniq()
    .value();
    
    console.log(ret)
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