Introducing Lo-Dash

In order to do the intersection, we need one more library – Lo-Dash.

Lo-Dash is good for collection manipulation.

What Lo-Dash can do?

1. Looping a collection
2. Make collection items unique
3. Check if collection contians a given item
4. Union collections
5. Intersection collections

Why using Lo-Dash but not Underscore? Consistancy and performance. Check this post Say "Hello" to Lo-Dash from the core Lo-Dash team for the consintancy reason. And this post for performance reason.

What’s next? We’re going to take a look at “Listing all the tags”.