title: Sort array of arrays by index
body: <p>I have the following multidimensional array: </p>
  
  <pre><code>const users = [
    [
      1020,
      "10-FEB-2019",
      "ajd",
      "Mary",
      "jones",
      "a@gmail.com",
      "25 main Lane",
      "brooklyn",
      "NY",
      "11210",
      "5165551212",
      "MEMB",
      "alk",
      "14-FEB-2019",
      93.35
    ],
    [
      1010,
      "08-FEB-2019",
      "dak",
      "Daisy",
      "smith",
      "d@gmail.com",
      "62 stone Drive",
      "brooklyn",
      "NY",
      "11210",
      "5165551212",
      "ADMIN",
      "ERR",
      "19-MAR-2019",
      71.487
    ],
    [
      1000,
      "05-FEB-2019",
      "alk",
      "Arnold",
      "smith",
      "a@gmail.com",
      "62 stone Drive",
      "brooklyn",
      "NY",
      "11210",
      "5165551212",
      "ADMIN",
      "alk",
      "14-FEB-2019",
      203.41
    ]
  ]
  </code></pre>
  
  <p>I want to sort this array by last name (index 4) - jones, smith, smith.
  I tried this <code>var sorted = _.sortBy(users[4]);</code> but it didn't work.</p>