JavaScript Guide – Basic JavaScript Concepts with Code Examples from Coding compiler. Pareto Guide: 20% of the language you need in 80% of cases. Only basic javascript concepts with code examples. Since the advent of JavaScript 20 years ago, it has come a long way from a modest tool for simple animations to the top ten of the Tiobe rating. It is a language with a high level of abstraction, which allows you to focus on the code, and not on the low-level implementation of the program. It has weak dynamic typing and supports various programming paradigms.