JavaScript

� �

Contents:
��Number �
�� String
�� Number <–> String
�� Boolean
�� Date
��Math
��Array
��Function
� logic
��Object
��type
� object-orientation
� Error (exceptions)
��LEGEND

�� Operator Precedence

More content is in the
product closeups, especially:

����DOM�(Document�
��� Object Model)

����Regular Expressions

The information here�
is part of two printed
references, that
VisiBone makes, the
JavaScript Card:

a dense, laminated,
four-page 8.5x11 book

and also the
JavaScript�Foldouts:
��
a set of three fan-fold
booklets with larger
print and smaller
folded size.

�
Does it look busy?
Well, it wasn't meant
for idle people!

Here are all the
features of client-side
JavaScript, in
living code.

English takes a
back seat here.��
To make solid�
code, learn to�
read, think and�
write in
JavaScript.
Fluency will
serve you best
in the end.

The assert()
function is the best
invention for
programming
since the subroutine.

Not only will its
proper use make
your software
test itself, earning
and protecting
reliability from the
start.

But it's a clear,
concise way to
describe exactly
what all the features
of JavaScript do.

�

Did I mention?
Feedback�
form below!

�

Regular Expressions
are very versatile for
validating or
analyzing strings.

See the JavaScript
Regular Expressions
reference.

If you are looking to
establish or extend
your business in
international markets,
it is very important to
ground your company's
brand and presence in
targeted countries. The
first step in a successful
strategy is to register
an international domain
for your company.
International domain
registration can be
tricky, so use a
registrar that knows
the requirements and
process is important.
Check out godaddy
for the widest selection
and best prices on
international domains.

�

�

�
The assert() function
is like a video camera.�
Hold on now, this will�
make sense in a sec.

Think how you first learn�
human language. You�
observe words spoken�
and their effects.�
Person A: "I'm hungry"�
Person B gives A food.�
You infer an association�
between making the�
sound "hungry" and�
getting fed.

This card can teach you�
JavaScript not by talking�
about it but by doing it�
and (here's the part I'm�
smug about) showing�
you the effects. The�
assert() function is a�
great way of showing�
you what JavaScript�
code does.

Imagine, instead of a�
dead-tree dictionary�
that defines words in�
terms of ... other words,�
it would instead show�
a video clip of people�
using and responding
to those words.

Assert makes the�
effects of JavaScript�
code visible, just like�
this video-dictionary�
would make the�
effects of human�
words visible.

�
�

�

�

VisiBone also makes
several printed web
color references.

Posters & Charts

Laminated Cards

that match the�
"VisiBone2"
swatch collection�
in Adobe
Illustrator and�
Photoshop.

�

Plus two varieties�
of Mouse Pads.

�

And a chart with�
1068 non-web-safe
colors:

Guaranteed compatible
with walls in Asia,
Europe, the Americas,
Africa, Australia and
California.

�

�

�

�

�


�

Thank you, and good luck building!
—

        
         
                IE   IE   IE   IE  IE  IE  IE  IE
                PC   Mac  PC   PC  Mac Mac PC  PC    Netscape   Mozilla   Opera
                4.01 4.01 4.01 5.0 5.0 5.1 5.5 6     4.7  6.0   0.9-1.0   6.03

JavaScript      X    X    X    X   X   X   X   X     X    X        X      X
JavaScript1.0   X    X    X    X   X   X   X   X     X    X        X      X

JavaScript1.1   X    X    X    X   X   X   X   X     X    X        X      X
JavaScript1.2   X    X    X    X   X   X   X   X     X    X        X      X
JavaScript1.3             X    X   X   X   X   X     X    X        X      X
JavaScript1.4                      X   X                  X        X      X
JavaScript1.5                                             X        X

Jscript         X    X    X    X   X   X   X   X

EcmaScript                X    X           X   X                          X

exceptions      no   no   yes  yes yes yes yes yes   no   yes     yes     yes
supported?


An "X" in row "Yyyyy" means code under <script language="Yyyyy"> will run
in the browser for that column.  For example:

     IE6/PC
     ------
     <script language="JavaScript 1.3">
          // runs
     </script>

     Netscape 6
     ----------
     <script language="EcmaScript">
          // ignored
     </script>

(Yes, there are two radically different browsers both claiming to be IE4.01,
one claims to support JavaScript 1.3 and EcmaScript, and exceptions work
perfectly, and the other not.)

See the Error section for a trick on how to include code with exceptions.