title: Populate a map with a default value
body: <p>I want to create a map of 48 default key value pairs.
  This code works fine:</p>
  
  <pre><code>var m = new Map();
  
  for(var i=1; i &lt;= 48 ; i++) {
    m.set(i,'0')
  }
  </code></pre>
  
  <p>But, I want to know if this can be done without using for loop.</p>