title: Updating a model attribute
body: <p>I am practising Backbone js. I have a collection consisting of 10 models. In just one model, I want to change 2 of the attributes. I am using the device local storage. I have tried the following code (this is just part of the larger script):</p>
  
  <pre><code>this.collection.forEach(function(user) {
                      if (user.get('subject') === 'Physics') {
                          user.set({'title': 'hdrodynamics'});
                          user.save();
                          console.log(JSON.stringify(user));
                          return;
                      }
                  });
  </code></pre>
  
  <p>I consider this method inefficient. What happens as the collection length increases. I believe there is a better way than this. </p>