Learn Flexbox, Flux-architecture and Mocha

It's tempting to pick up a framework which has preselected flexbox or grid as the layout tool of choice, but it's important to learn when and why to use each method. This leads to slimmer stylesheets which results in better site performance, and less likelihood for "hacks" to make one method do what the other does inherently better. 

Throughout this collection, we will be progressively styling a responsive landing page template while building your knowledge on when to select grid or flexbox for any layout scenario. Spoiler alert: sometimes the best solution is using both!

The specification describes a CSS box model optimized for user interface design. In the flex layout model, the children of a flex container can be laid out in any direction, and can “flex” their sizes, either growing to fill unused space or shrinking to avoid overflowing the parent.

flexbox

Create a Landing Page with CSS Grid and Flexbox

Flexbox is a powerful way to layout HTML so that elements can grow to fit the size of their container.  It can also control how the elements are positioned within a flexed container.  

Once you start thinking in `rows` and `columns`, you can control almost any flexed layout with just a few simple flexbox layout primitives.

Get Started with Flexbox CSS Layouts

Flexbox is a wonderful tool built into the CSS specification. Using flexbox doesn't require any special framework or library, just a browser with CSS3 support. It is so awesome, and makes the arranging elements on a page almost fun!

Flexbox Fundamentals

Demystifying alignment in flexbox children

Flexbox makes it easier to create layouts that can adjust depending on the content that is added and the space available. In this lesson we look at a couple real-world applications of Flexbox in an application and website.

Using Flexbox in Websites and Applications

The flex-basis property allows us to define the dimension (along the flex-direction axis) that a flexbox child should ideally have.

Defining dimensions on flexbox children using flex-basis

Flex-basis lets us set the ideal dimensions for a flexbox child, but flex-shrink lets us define what should happen if there isn't enough room, and flex-grow can define what happens when there is too much room.

Using flex-shrink and flex-grow to make flexbox children resize correctly

Using the `order` property we alter the order in which flexbox children appear on the page, without making changes to the dom.

Using order to rearrange flexbox children

The flex shorthand makes it easier to declare flex-shrink, flex-grow, and flex-basis, but it sometimes has unexpected results because the defaults differ.

Combining the flexbox sizing properties using the flex shorthand

The Flexbox css spec allows for more adjustable layouts. The `flex-direction` property allows you to easily change the layout on the children of an element without making any changes to the dom, which is particularly useful when combined with media queries.

Using flex-direction to layout content horizontally and vertically

Adding flex-wrap to a flexbox container allows the items to form a grid. The content can then be aligned and distributed along the grid using justify-content and align-content.

Turning a flexbox into a grid using flex-wrap and align-content

Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework.

chai

Every dependable library needs to have tests to ensure that you don't push accidental bugs. In this lesson, see how you can set up mocha and chai to start testing your library.

Setting up Unit Testing with Mocha and Chai

Now that you've got everything set up with mocha and chai, it's time to actually write tests. In this lesson you'll learn how to use `describe` and `it` to outline your tests and make sure you don't break your library in the future.

Unit Testing with Mocha and Chai

Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases.

mocha

Mocha is a testing framework that provides structure for unit tests. In this lesson, we will be setting up Mocha with npm and npm scripts, writing a "Hello World" unit test, then writing the code to make the test pass (as an example of Test Driven Development (TDD), with the "red-green-refactor" workflow).

JavaScript Testing Fundamentals: Hello world unit test with Mocha (in ES6)

In this lesson, we will use Chai's request method to test our Node application's API responses.
By the end of this lesson, you will know how to:
- install the prerequisites to use mocha and chai in your application
- test for HTTP status response codes
- test for a string of text on a page
- test for a json response and validate the properties of the object
- write tests that not only verify the response of your application, but the behavior as well


Test Node RESTful API with Mocha and Chai

React Native lets you build mobile apps using only JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components.

react-native

React Native utilizes flexbox for layout, and you can apply styles inline, or via external stylesheets. We will learn about both approaches, and create some basic styles for a native application.

For getting your application setup, you might want to checkout [this lesson](https://egghead.io/lessons/react-react-native-up-and-running?course=react-native-fundamentals&from=react-applying-styles-in-react-native)

Applying Basic Styles in React Native

Writing great ES6 style Promises for Node.js is only half the battle. Your great modules must include tests as well to ensure future iterations don't break them. In this lesson, I show you a simple ES6 Promise in Node.js, then walk you through creating tests in Mocha using chai and chai-as-promised to test both resolve and reject methods.

Testing ES6 Promises in Node.js using Mocha and Chai

In this lesson, you will learn how to verify your API server is returning HTTP 400 responses when clients submit incorrect data. Returning HTTP 400 ensures that your clients are notified of the incorrect usage. Testing for them ensures your API returns errors instead of incorrect responses when supplied with incorrect data.

Test for HTTP 400 responses with Mocha and Chai

After setting `display: flex` on a parent element, you can use `flex-direction` to switch the container to be either a `row` or a `column`.

We also switch the body between `row` and `column`.

Flex into a Row or a Column with flex-direction

We can space items inside of a flexed component in the "on-axis" direction, with `justify-content`.

Justify content can take the following values: `flex-start`, `flex-end`, `center`, `space-between`, `space-around`, or `space-evenly`

Change the Spacing of Flexed Components with justify-content

We changed the axis layout with 'justify-content', and the "off axis" layout is controlled by 'align-items'.  The most common values are `flex-start`, `flex-end`, or `center`.

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