title: How to Filter data using lodash conditionally
body: <p>How to get the ids as array from this list conditionally.
  If the level is one then the user_id otherwise admin_id.  </p>
  
  <pre><code>var users = [
        { 'user': 'barney', 'age': 36, 'active': true  , level:1, 'user_id':'1', admin_id:'11'},
        { 'user': 'fred',   'age': 40, 'active': false , level:2, 'user_id':'2', admin_id:'22'},
        { 'user': 'barney', 'age': 36, 'active': true , level:1, 'user_id':'3', admin_id:'33'},
        { 'user': 'barney', 'age': 36, 'active': true , level:2, 'user_id':'4', admin_id:'44'},
        { 'user': 'barney', 'age': 36, 'active': true , level:1, 'user_id':'5', admin_id:'55'}
      ];
  </code></pre>
  
  <p>Expected array : <strong>[1,22,3,44,5]</strong></p>