HTML and CSS Reference
In-Depth Information
A FEW LANGUAGE
ESSENTIALS
A brief appendix isn't enough to cover any language,
even one as straightforward as JavaScript. However, the
following sections will fill you in on a few language essen-
tials that you'll need to digest the examples elsewhere in
this topic.
Variables
Every programming language has the concept of
vari-
ables
—containers that you can use to store bits of in-
formation in memory. In JavaScript, every variable is
created the same way, by declaring it with the
var
