title: Meteor callbacks returning undefined
body: <p>So I've recently started using Meteor.js, and although I appreciate its power, I'm having some issues with the way some of it works. I have a very basic couple of functions that I'm trying to use to get the hang of returning data to the client.</p>
  
  <p>In my server folder:</p>
  
  <pre><code>Meteor.methods({
  "thing": (number) =&gt; {
      return number;
  }
  });
  </code></pre>
  
  <p>And then when it is used:</p>
  
  <pre><code>const five = Meteor.call("thing", 5);
  console.log(five);
  </code></pre>
  
  <p>But all I get is <code>undefined</code></p>
  
  <p>This is so basic, I assume I must have a fundamental misunderstanding about how this process is supposed to work. I have tried reading up on similar questions, but they mostly reference asynchronous processes, whereas this shouldn't wait on anything. </p>