Do you know of a good quick reference guide for a number of programming languages?

Question

In the course of my job I am maintaining code in a number of programming languages (listed below). As I haven't mastered most of them I keep forgetting the differences in syntax between them. Is there a good reference which covers (preferably for all of them on a side of A4, in a table) the basic features of the language e.g.

• conditional statements (if (something) {} or not?)
• comparison operators (is it =, ==, or sometimes ===? Is it <> or !=)
• Are variables case sensitive?
• How do you concatenate strings? ( . & or + ?)

I would like this for:

• Python
• PHP
• Perl
• Javscript
• ASP

Answer 1

DZone has quite a few.

Answer 2

gotapi is a nice place

http://www.gotapi.com/html

I would definetely have a look at it

you should also visit dzone's refcardz

http://refcardz.dzone.com/

they have a lot of useful reference cards...

like this one

http://refcardz.dzone.com/announcements/php

Answer 3

http://rosettacode.org/wiki/Main_Page is your friend :)

Answer 4

I would start by looking for programming cheat sheets. Here's one pretty good selection.

Answer 5

http://pleac.sourceforge.net/ this one is good to :)

Answer 6

PHP:

Conditional statements

• if ($cond)
• $cond ? $value_if_true : $value_if_false;

Comparison operators

PHP supports the following basic comparison operators:

• ==
• !=

It also contains type-safe operators:

• ===
• !==

Expressions can be negated using the unary ! operator.

Boolean operators

The basic boolean operators are:

• && / and
• || / or

Case sensitivity

PHP variables are case sensitive. So are associative array keys.

String concatenation

. (dot) is used for string concatenation in PHP.

Answer 7

http://www.cheat-sheets.org/

Answer 8

http://merd.sourceforge.net/pixel/language-study/syntax-across-languages/ has more languages than you want, but at least it is focused on syntax. No single page, either.

Answer 9

Smashing mag has always good links for that ;)

http://www.smashingmagazine.com/2006/10/30/cheat-sheet-round-up-ajax-css-latex-ruby/

Answer 10

asp classic:

Conditional statements

if (cond) then

else

end if

Comparison operators

ASP classic supports the following basic comparison operators:

=

!=

Expressions can be negated using the unary ! operator.

Boolean operators

The basic boolean operators are:

and

or

not

Case sensitivity

ASP classic variables are NOT case sensitive.

String concatenation

& (ampersand) is used for string concatenation, you can also use "+".