title: const vs. var in nodejs require statement
body: <p>I am importing library in my nodeJS code using const or var, want to know which is a better approach and memory efficient?  </p>
  
  <p>Option 1:</p>
  
  <pre><code>const _ = require('lodash');
  </code></pre>
  
  <p>Option 2:</p>
  
  <pre><code>var _ = require('lodash');
  </code></pre>
  
  <p>Which is better? Option-1 or Option-2 ?</p>