title: How to join arrays using Lo-Dash
body: <p>Since I’m trying out Lo-Dash, I’m wondering how to join and sort two arrays?  </p>
  
  <p><code>A1: [ 3, 1 ]</code></p>
  
  <p><code>A2: [ { 1: ‘val 1’ }, { 2: ‘val 2’ }, { 3: ‘val 3’ }, { 4: ‘val 4’ }, … ]</code></p>
  
  <p><code>A1 join A2 orderBy Vals: [ { 1: ‘val 1’ }, { 3: ‘val 3’ }]</code></p>
  
  <p>Sorting seems straightforward using <code>_.sortBy</code>.  But how can a join be performed?</p>