title: Map Reducing object with underscore
body: <p>I want to reduce this object to just an object containing product name and average price. What's the fastest way to do it?</p>
  
  <pre><code>var foo = { group1: [
          {
              name: "one",
              price: 100
          },
          {
              name: "two",
              price: 100
          }],
         group2: [
          {
              name: "one",
              price: 200
          },
          {
              name: "two",
              price: 200
          }],
         group3: [
          {
              name: "one",
              price: 300
          },
          {
              name: "two",
              price: 300
          }]
        }
  </code></pre>
  
  <p>resulting in </p>
  
  <pre><code>var foo2 = [{  
                 name: 'one',  
                 price: 200
              },{
                 name: 'two', 
                 price: 200
              }];
  </code></pre>
  
  <p>Thanks!</p>