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Introduction to the JavaScript Programming Language

Published Jan 26 2018

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JavaScript is one of the most popular programming languages in the world.

Created in 1995, it’s gone a very long way since its humble beginnings.

Being the first - and the only - scripting language that was supported natively by web browsers, it just stuck.

In the beginnings, it was not nearly powerful as it is today, and it was mainly used for fancy animations and the marvel known at the time as DHTML.

With the growing needs that the web platform demands, JavaScript had the responsibility to grow as well, to accommodate the needs of one of the most widely used ecosystems of the world.

Many things were introduced in the platform, with browser APIs, but the language grew quite a lot as well.

JavaScript is now widely used also outside of the browser. The rise of Node.js in the last few years unlocked backend development, once the domain of Java, Ruby, Python and PHP and more traditional server-side languages.

JavaScript is now also the language powering databases and many more applications, and it’s even possible to develop embedded applications, mobile apps, TV sets apps and much more. What started as a tiny language inside the browser is now the most popular language in the world.

A basic definition of JavaScript

JavaScript is a programming language that is:

In case you’re wondering, JavaScript has nothing to do with Java, it’s a poor name choice but we have to live with it.

JavaScript versions

Let me introduce the term ECMAScript here. We have a complete guide dedicated to ECMAScript where you can dive into it more, but to start with, you just need to know that ECMAScript (also called ES) is the name of the JavaScript standard.

JavaScript is an implementation of that standard. That’s why you’ll hear about ES6, ES2015, ES2016, ES2017, ES2018 and so on.

For a very long time, the version of JavaScript that all browsers ran was ECMAScript 3. Version 4 was canceled due to feature creep (they were trying to add too many things at once), while ES5 was a huge version for JS.

ES2015, also called ES6, was huge as well.

Since then, the ones in charge decided to release one version per year, to avoid having too much time idle between releases, and have a faster feedback loop.

Currently, the latest approved JavaScript version is ES2017.

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