title: forEach and map function to iterate through nested json arrays of objects and create a new array
body: <pre><code>var res=[
        {
           "id":1,
           "type_name":"Weight",
           "type_abbr":"wt",
           "uoms":[
              {
                 "id":1,
                 "unit_abbr":"sh tn",
                 "unit_name":"Short Tons",
                 "created_at":"2017-06-07 00:35:06",
                 "updated_at":"2018-05-24 23:34:25",
                 "uom_type_id":1
              },
              {
                 "id":3,
                 "unit_abbr":"g",
                 "unit_name":"Grams",
                 "created_at":"2017-06-07 00:35:06",
                 "updated_at":"2018-05-24 23:34:25",
                 "uom_type_id":1
              }
           ]
        }
     ]
  </code></pre>
  
  <p>I am trying to iterate through each result and grab the nested <code>uoms.unit_name</code> and inject them into a new array. Below is my non-working code. Thank you in advance.</p>
  
  <pre><code>res.forEach((uom) =&gt; {
    const uomsArr = uom.uoms.map(uoms =&gt; uoms.uoms);
  });
  </code></pre>