A re-introduction to JavaScript

Why a re-introduction? Because JavaScript is notorious for being the world’s most misunderstood programming language. It is often derided as being a toy, but beneath its layer of deceptive simplicity, powerful language features await. JavaScript is now used by an incredible number of high-profile applications, showing that deeper knowledge of this technology is an important skill for any web or mobile developer.

— Read on developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript