Now that we have the nice logic of lazy loading in place, let's take a look at what happens here under the hood.

The .autorun() function , which we created earlier, will run the first time the code gets executed, subscribing us to the lazyload-posts publication. Meteor then sends the first two documents of the Posts collection, as the limit we first sent is 2.

The next time we change the lazyloadLimit session, it changes the subscription by changing the limit to the value we passed to the publication function.

Meteor then checks which documents exist in our client-side database in the background and requests to download the missing ones.

This will also work the other way when we decrease the session value. Meteor removes the documents that don't match the current subscription/subscriptions.

So, we can try this; we open the console of our browser and set the session limit to 5:

Session.set('lazyloadLimit', 5);

This will immediately display all five example posts in our list...