Gain insights into building real-world components using JavaScript. Delve into dropdown menus, auto-validating forms, autocomplete search, infinite scroll, and tooltips to tackle common frontend challenges seamlessly.

Learn to apply your introductory knowledge of HTML, CSS, and JavaScript to build beautiful, real-world components. In this course, you'll go through the process of developing several complex components, including:

- eBay's dropdown menu
- Gmail's auto-validating form
- Google's main autocomplete enabled search
- Twitter's infinitely scrolling list
- Medium's tooltips

You'll learn how to approach common frontend challenges, what questions to ask yourself, how to design solutions once you've thought of them, how to debug and work with mistakes, and more.

The end-goal is to empower you to look at anything you see on a website and be able to say, "I can build that!"

Intermediate JavaScript: Building Frontend Components

# What are integration tests?

Integration tests are extremely similar to unit tests. You write integration tests to test that functions work well together. It's possible to have functions that pass comprehensive sets of unit tests but be part of failing integration tests. They usually involve multiple systems interacting together. 

# Example
Consider our form and how it might be sent to a server. We can have a function called `serialize`, which gives a representation that can be stored as a string and a `deserialize` function, which reads data in that form and populates our field with that data.

In this lesson, we'll learn what integration tests are and see one in practice.

Welcome

Building a Dropdown Menu

Building the Autocomplete Search

Building Tooltips

Building an Autovalidating Form

Building an Infinite List

From Toy Components to Production

Integration Tests

What are integration tests?