Learn Flux, React-native and Scss

A skeleton loader is a popular UI pattern for loading screens: instead of a spinner, we show static or an animated placeholder for the information that is still loading. 

In this course, we go through 3 instrumental libraries for React Native - Linear Gradient, Masked View, and Reanimated 2 - and in the end, we use them in tandem to build a Skeleton Loader.

**Linear Gradient** [Expo](https://docs.expo.dev/versions/latest/sdk/linear-gradient/) | [Pure React Native](https://github.com/react-native-linear-gradient/react-native-linear-gradient)

**Masked View** [Expo](https://docs.expo.dev/versions/latest/sdk/masked-view/) | [Pure React Native](https://github.com/react-native-masked-view/masked-view)

**Reanimated 2** [Expo](https://docs.expo.dev/versions/latest/sdk/reanimated/) | [Pure React Native](https://github.com/software-mansion/react-native-reanimated/)

This course is built using an iOS simulator on plain React Native. Still, it will work on Expo and Android (you'll need to follow the relevant installation instructions available in the documentation).

The finished code for the skeleton loader (last 2 lessons) is available on [Expo Snack](https://snack.expo.dev/@kadikraman/animated-skeleton-loader).

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

Building a Customizable Animated Skeleton Loader in React Native

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

How to create buttons in React Native depending on the level of desired customisability: the quick and simple Button, a more customisable Touchable, and the most customisable Pressable.

Button component is useful for quick prototyping.

TouchableOpacity is the most common way of creating buttons and other touchable areas, and is suitable for most use cases.

Pressable gives you the most control over the look and feel of your button, including customising the pressed state and text, as well as handling long presses separately from regular presses.

Creating Buttons in React Native with Three Levels of Customization

If you already know React, then React Native is a great way to build mobile apps for iOS and Android. Of course, web and mobile apps are very different to build — but this course serves as your guide.

In this course, we’ll build a mobile app from start to release with React Native for both iOS and Android. Prior React experience is required, but you don’t have to know anything about mobile development to participate.

Throughout the course, we’ll be building a “Restaurant Review” app. We’ll use all the standard mobile UI elements like text, images, form inputs, buttons, scroll views, and icons, and we’ll show several navigation techniques like push, modal, and tabs. The app will make HTTP API calls to a server and will store data on the device with AsyncStorage. Finally, we’ll specify a custom app icon and splash screen, deploy the app to a physical device, and prepare the app for release to the App Store and Play Store or for ad-hoc release.

Build a React Native Application for iOS and Android from Start to Finish

React makes it intuitive to build real-world web application. But in reality, you need to use a host of other services to get the app in front of real users. 

This course walks you through setup and implementation to get your cloud-based application up and running. 

You’ll learn to set up:
* a new project in AWS Amplify configured to your React app
* user authentication with Amazon Cognito 
* managed GraphQL with AWS AppSync
* image storage and retrieval with Amazon S3
* text translation via Lambda functions
* and finally, deployment of your application on AWS using Amazon S3

You’ll finish the course ready to quickly and easily deploy your serverless React application, so users can start using and enjoying it right away.

Building Serverless Web Applications with React & AWS Amplify

React Navigation makes the easy things easy and the hard things possible. This course will help you understand how to customize and use React Navigation for more complex navigation patterns.

You'll learn different ways to display content within the navigators, which demonstrates the built-in customizations within React Navigation. As well as learn how to interact with different UI components within React navigation, which will help you structure your application. 

Building off this, you'll learn how you can customize the default navigator behavior to provide a custom look and feel to your React Navigation application

To succeed in this course, you’ll want a basic understanding of the React Navigation API and how to use the default navigators.

Note: React Navigation has been updated to v2. This course was recorded on v1.x and the lesson code has been updated to reflect v2. The principles and patterns taught in the videos remain valid.

React Navigation for Native Mobile Applications

CSS uses a global namespace for CSS Selectors that can easily result in style conflicts throughout your application when building an application using modern web components. You can avoid this problem by nesting CSS selectors or use a styling convention like BEM but this becomes complicated quickly and won’t scale.

CSS-in-JS avoids these problems entirely by generating unique class names when styles are converted to CSS. This allows you to think about styles on a component level with out worrying about styles defined elsewhere.

In this course, you will learn how to express popular SCSS (Sass) language features using latest JavaScript features. We will convert simple examples from SCSS to CSS-in-JS. As a designer or (S)CSS developer, you should be able to follow without extensive JavaScript knowledge, understanding SCSS is required though. We will not be using any particular CSSinJS libraries. Instead, we will focus on a base knowledge you need later if you use any CSSinJS library.

Sass is the most mature, stable, and powerful professional grade CSS extension language in the world.

scss

Convert SCSS (Sass) to CSS-in-JS

React Native Video is a community supported video element for React Native. It allows for remote loading of videos and also works with the React Native asset management system to load videos. Having a flexible video component is essential to developing and enhancing your application.
Like many React Native elements, the video element is very basic and doesn't ship with anything besides a flexible API. This allows you to develop the exact layout, controls, and custom overlays to match your application.

In this course we'll take a look at a basic setup. Then explore the different ways we can load and show videos. We'll show how to use a few of the custom callbacks to overlay errors and buffering elements. Because there are no controls shipped with `react-native-video` we'll show how to write custom video controls and animate them when the video has not been interacted with.

Finally we'll cover a few common paradigms found in the wild. Including repeating background cover videos, auto-playing videos when they scroll onto the screen and auto-stopping them when they are scrolled away from.

Fundamentals of React Native Video

In this course we'll explore how to create many popular animated concepts in applications across web and mobile applications. We'll look at both simple, complex, and subtle interactions that you can use to enhance your React Native application.


This course should empower you to look at an animation in an application, break down the effect, and rebuild it in your own application.


The ultimate goal is to show how using the basic Animated calls we can build out effective and complex animations that take your application to the next level.

Real World React Native Animations

Have you ever wished for access to conditionals or iteration when writing styles? How cool would it be to use functions to write styles? SCSS has that and more! SCSS is a superset of CSS. Any valid CSS is SCSS, they even have the same syntax. SCSS borrows features from other languages to write smarter, reusable and more readable styles. This course will focus on how to use SCSS’s more useful features, compare them against each other and assess when their usage is appropriate.

Learn the Best and Most Useful SCSS

In this course, we will be building a React Native news app that is read-only when offline. 

The videos are recorded on a Mac with an iPhone 13 Simulator using plain React Native, but you can do this course using Android, Windows and even the Expo managed workflow. See the lesson description for platform-specific instructions. The solutions repo has been verified to work on a Pixel 3a Emulator on Mac.

The completed app for this course is available [here](https://github.com/kadikraman/news-flash) and each lesson will include a link to the commit that added the code so you can check your work.

After we build our news app, we're going to enhance it to make it read-only when offline using urql'g GraphCache.

This course will require you to run the api locally on your device. The api repo is available [here](https://github.com/kadikraman/news-flash-api).

**Resources:**
- urql: https://formidable.com/open-source/urql/docs/
- Insomnia: https://insomnia.rest/
- Async Storage: https://github.com/react-native-async-storage/async-storage
- React Native Netinfo: https://github.com/react-native-netinfo/react-native-netinfo

Build a News App with React Native, GraphQL and TypeScript

In this course we will learn and demonstrate the basic concepts of the React Native Animated API. We'll use Animated calls like `timing` and `spring` to animate style properties, and learn how to combine animations to create more complex effects. We'll learn about more advanced interactions like animations with touch events, interpolation, and flip animations. The ultimate goal is to gain an understanding of how to animate React Native Views, how you can apply them to many different types of styles, and how to enhance the experience in your application.

React is one of the web’s most popular frameworks for building JavaScript applications. 

If you know what you’re doing, React can drastically simplify how you build, use, and maintain code.

Whether you’re a React newbie or you’re ready for advanced techniques, you can level-up with egghead. Explore our in-depth courses, lessons, and community resources to build more powerful applications and crack open your career.

react

Animate React Native UI Elements

In this course we’ll explore getting started with a basic React Native application on both iOS and Android. We’ll learn about using React Native components, how to build custom components, how to layout an application using Flexbox, and how to style components.


We’ll also focus on how to use state to control components, how to persist information across application reloads with AsyncStorage, and how to inline edit in a ListView.

The ultimate goal is to gain an understanding of how to get started building simple React Native applications.

Build a React Native Todo Application

Techniques to improve your CSS, Sass, and HTML implementations for everyday scenarios. 

Learn the Fundamentals of CSS and Sass to Create Modern and Responsive Layouts 

In this lesson we'll use the ListView component to render a list of items that were entered. We'll show how to setup a ListView.DataSource and how to render custom rows with performance in mind.

Create a List of Items with a React Native ListView

Copy/pasting the same code is redundant and updating copy/pasted code slows development velocity. Mixins are reusable chunks of code that are included, similar to calling a function, instead of copy/pasted.

Mixins have some nice features:
- Arguments just like functions.
- Arguments can have default values and optional values.
- Named arguments allow us to use optional and default arguments when the mixin is included.
- Variable arguments allow us to have a dynamic number of arguments when the mixin is included.
- The @content directive allow us to add additional styles when the mixin is included.

In this lesson we learn how to DRY up the code with the SCSS @mixin directive and make copy/paste a thing of the past.

Reuse Styles with the SCSS @mixin Directive

Updating the same color or metric multiple times is no fun. SCSS variables improve maintainability by allowing one name to represent a value that can be used anywhere. SCSS variables also give us the power of creating our own naming conventions to express the intent of specific values. In this lesson we learn how to use SCSS variables to assign user friendly names to colors/metrics so one value change will update that value in all the right places.

Use SCSS Variables for Readable and Maintainable Stylesheets

SCSS nesting can produce DRYer code by targeting child elements without having to write the parent class. Nesting up to 3 levels deep can help us understand relationships between styles. The SCSS parent selector represents the parent class, so it can DRY up targeting pseudo-elements/classes and be an asset for naming conventions. In this lesson we learn how to remove the redundancy of targeting pseudo-elements/classes, and child elements by taking advantage of SCSS’s nesting and parent selectors.

Organize Styles with SCSS Nesting and the Parent Selector

In this lesson we learn how to set up SCSS  and transpile your SCSS code into CSS with node-sass.

Transpile SCSS to CSS using node-sass

Tired of dealing with monolithic CSS files? Are requests for multiple CSS files hurting your performance? In this lesson we learn how to separate our styles with SCSS partials, and how SCSS imports compile to one file so there's only one request.

Organize SCSS into Multiple Files with Partials

We can write reusable styles with the SCSS @extend or @mixin directives. Which one is better? It depends. A better question is, how do they differ?
Extends:
change the source order, mixins don’t.
maintain relationships, mixins don’t.
share inherited traits, mixins don’t.
can extend multiple classes, mixins don’t.
can create multiple class declarations in the compiled CSS, mixins don’t.
can use the placeholder selector, mixins don’t.

Mixins:
can accept arguments, extends don’t.
can pass additional content, extends don’t.
repeat code when compiled, extends group class names together.
work well wIth media queries, extends have a limited interaction wIth media queries.

In this lesson we learn about writing reusable styles with the @extend directive and how it compares to the @mixin directive.


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