JavaScript® (often shortened to JS) is a lightweight, interpreted, object-oriented language with first-class functions, most known as the scripting language for Web pages, but used in many non-browser environments as well such as node.js or Apache CouchDB. It is a prototype-based, multi-paradigm scripting language that is dynamic, and supports object-oriented, imperative, and functional programming styles.

javascript

Learn Javascript

Most examples for reduce show you how to take an array of numbers and reduce them to a simple sum. Reduce is a great tool for this, but it can do so much more. It is a powerful tool, and essential to functional programming techniques.

This course will dig deep into the Array#reduce in JavaScript and give you a solid understanding to start using it today.

Reduce Data with Javascript Array#reduce

Stimulus is self-described as "A modest JavaScript framework for the HTML you already have".

This collection will show you how to build a Stimulus controller that allows a user to filter a collection of DOM elements based on a variety of inputs.

You'll learn:

* How to connect a Stimulus controller
* What an `action` and a `target` are, and how they work
* Modern JavaScript to make filtering a collection simple
* Techniques to make your code extensible and reusable

Filter a Collection Using Stimulus

Regular expressions are a useful tool for dealing with text data. They allow us to slice and dice strings, and useful extract information in our applications.

Regex is also complex, and many developers will spend their entire career looking up even the most trivial of regex operations.

This course will help improve your regex skills, and teach a solid core of useful tools that you can use every day with confidence!

Regex in Javascript

Miscellaneous one-off lessons on debugging, productivity hacks, and JavaScript tricks.

Tips and Tricks

Nodejs

This playlist will guide you trough short circuit operators in JavaScript. In the first video you will get an introduction to what short circuits are proceeded with some of the most popular practical applications of it.

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

Learn Practical Application of Short Circuits in JavaScript

This course takes a look at some of the new features that JavaScript has available with ES6 (ECMAScript 2015). It is a "montage" from several instructors.

Learn ES6 (ECMAScript 2015)

im·mu·ta·ble i(m)ˈmyo͞odəb(ə)l/ adjective - **unchanging over time or unable to be changed**.

Mutating data is the source of never ending headaches in software systems, and JavaScript code is no exception. Immutable data structures, pure functions, uni-directional data flow... you've probably been hearing these terms.

Immutable.js provides us the data structures and utilities that we need to start introducing this powerful concept of immutability into our applications.

Immutable.js provides many Persistent Immutable data structures including: List, Stack, Map, OrderedMap, Set, OrderedSet and Record.

immutable

Learn how to use Immutable.js

Stimulus is a JavaScript framework that is purposed to enhance your HTML. Stimulus will monitor your HTML and wait for its `data-controller` attribute to be declared on an element. Thats when you controller JavaScript is connected and its methods triggered.

Intro to Stimulus

The underpinnings of tools like Babel and ESLint, Abstract Syntax Trees (or ASTs) are not nearly as scary as you might think. This is a collection of all the egghead.io lessons I (Kent) have put out there.

Abstract Syntax Trees

Lessons based on posts from my blog - https://kyleshevlin.com

Kyle Shevlin's Blog Lessons

This collection of videos teaches you how to use [KeystoneJS](https://v5.keystonejs.com) to build a CRUD-ready GraphQL API, coming with an automatically generated Admin UI. 

Starting with a blank file, we will create an API by:
- defining "Lists" as content types
- adding fields (Select, Text, Checkbox, ...) to our lists
- customising access control to define what users can (and cannot!) do with our API.

GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.

graphql

Build a CRUD-ready GraphQL API + Admin UI with KeystoneJS

***Note: Some of the RxJS syntax used in this course is outdated, but the concepts taught on arrays, async, and observables are still reliable and applicable.***

Async programming may seem daunting. How can we write programs that accept user input, run animations, and send server requests over the same period? How do we keep the code clear and concise? How do we gracefully propagate and handle asynchronous errors? How can we avoid memory leaks caused by dangling event handlers? JavaScript's loops and try/catch keywords are no help - they only work on synchronous functions.

Here's the good news: Asynchronous programming is much easier than it seems. The key is to think differently about events. It is possible to build most asynchronous programs using a handful of simple functions. We will learn why most JavaScript developers approach asynchronous programming the wrong way, and how to avoid these common mistakes. 

RxJS is a library for composing asynchronous and event-based programs by using observable sequences. 


rxjs

Asynchronous Programming: The End of The Loop

Examples on how to use the contentful-migration tool to change content models programmatically 

Contentful migration tool in action

Learn the main additions. Including flat, flatMap and Object.fromEntries.

ES2019 Additions to JavaScript

With the release of the React Hooks API, it is now possible to store state in functional components. In this playlist, we'll take an initial look at the `useState` hook as well as a few others. In one of the later lessons, we'll build a custom hook, a tool for easily sharing functionality with more that one component.

An Introduction to React Hooks

These are some of my egghead.io lessons that are focused on JavaScript.

JavaScript from Kent

This is a small collection of videos to help you get familiar with Chrome browser's performance oriented developer tools.
In this collection, learn how to record a performance profile, tweak the settings to get the most relevant profile and finally a look into the different sections of the performance data visualisation.

Basics of Chrome's Performance Devtools

Anything related to JavaScript performance

Javascript Performance

Learn how to create a simple grid-based game with React, CSS Grid, and `useReducer`.

Check out the [accompanying article](https://kyleshevlin.com/tic-tac-toe)!

Tic Tac Toe in React

Javascript offers different ways to work with arrays one of the most used data structure out there.
Learn some of this methods and functions to improve the way you manipulate arrays in your code.

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