Hello World
No programming language should be published without a customary Hello World program—why should this book be any different?
Type (don't copy and paste) the following code in JS Bin:
function sayHello(what) { return "Hello " + what; } console.log(sayHello("world"));
Your screen should look something as follows:

An overview of JavaScript
In a nutshell, JavaScript is a prototype-based scripting language with dynamic typing and first-class function support. JavaScript borrows most of its syntax from Java, but is also influenced by Awk, Perl, and Python. JavaScript is case-sensitive and white space-agnostic.
Comments
JavaScript allows single line ...
Get JavaScript : Object-Oriented Programming now with the O’Reilly learning platform.
O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.