title: returning function instead of value
body: <p>im tring to format some values and also creating a if statement in case that the value is null, but is returning me a function instead of a value.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>var data = _.map(information).map(function(x) {
    return _.assign(x, {
      age: function() {
        if (x.age != null) {
          x.age.toString();
        }
      }
    });
  });
  </code></pre>