title: How to initialize a Map in ES6/ES2015 similar to an Object expression?
body: <p>What is the equivalent of</p>
  
  <pre><code>var object = {
    'foo': 'bar',
    1: 42
  }
  </code></pre>
  
  <p>using an ES6 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map" rel="noreferrer">Map</a>?</p>