Although variables are a fairly simple aspect of JavaScript, they are also universal and essential. Knowing how to work with them is like mastering the basic moves of a martial art: practice pays off.

So how do you putt a variable to your code (or declare a variable, as it's more traditionally called)? In JavaScript ... Writing a simple program that says "Hello world!" is generally the first ...

The result is "3" in this simple example. Add numbers in JavaScript by placing a plus sign between them. You can also use the following syntax to perform addition: var x+=y; The "+=" operator ...