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

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

There are two common ways to redirect the browser in JavaScript. Both use `window.location` but they differ in how they interact with Session History (and hence, the browser's back button). In this lesson, you'll learn how they're different and how to use each of them.

Redirect the browser using JavaScript

`JSON` (JavaScript Object Notation) is a standard method to serialize JavaScript objects and is commonly used to transfer data from the server to the browser. The browser has a `JSON` API that allows you to serialize a JavaScript object or array into a `JSON` string. This API allows you to customize the serialization very specifically as well.

The JSON.stringify API

In JavaScript, you can change the content of a string using the `replace` method. This method signature is overloaded with a bunch of different ways to do string replacement in JavaScript. This lesson covers the entire API (including an interesting [DSL](https://en.wikipedia.org/wiki/Domain-specific_language) for the replacement string).

How to use JavaScript's String.replace

`JSON` (JavaScript Object Notation) is a standard method to serialize JavaScript objects and is commonly used to transfer data from the server to the browser. The browser has a `JSON` API that allows you to parse the `JSON` string into a JavaScript object. This API allows you to customize the parsing behavior very specifically as well.

The JSON.parse API

There are four common ways to get a substring from a string in JavaScript, `substring`, `substr`, `slice`, and `split` + `join`. In this lesson you'll learn what the API to each of these methods is and how they compare.

4 common ways to get a substring from a string in JavaScript

A JavaScript Proxy allows you to intercept operations performed on objects, arrays, or functions like property lookup, assignment, invocation, property deletion, and more to add custom behavior. In this lesson we look at how to intercept property lookup with the `get` "trap" that will allow us to get items starting from the end of the array with ease.

Use ES6 Proxies

[Public Class Fields](https://tc39.github.io/proposal-class-public-fields/) allow you to add instance properties to the class definition with the assignment operator (`=`). In this lesson, we'll look at their use case for simplifying event callbacks and state initialization with a React component.

JavaScript from Kent

Kent C. Dodds

Course Content