# Introduction

Free, good online Book:

+ <http://eloquentjavascript.net/>

If you are an experienced programmer, a quick guide to JavaScript is the following:

1. JavaScript is loosely-typed, and variables are defined with the `var`
	 keyword. ES6/ES2015 introduces the `const` and `let` keywords.
2. Functions are first-class objects, meaning they can be saved to variables.

Bra generellt:

+ <http://bonsaiden.github.io/JavaScript-Garden/>
+ <http://www.improgrammer.net/simple-yet-powerful-javascript-tips/>
+ <http://jstherightway.org/>