Revision as of 14:48, 12 May 2009

Main Article

Discussion

Erlang Language Programming Tutorials

History

Overview

Basic Erlang

Get to know the Command Line

Errors - working with exceptions

Processes and Messages

Trapping Exit Signals

Timeouts

Macros

Techniques of Recursion

List Comprehensions

List Comments

Syntax

Functions are defined by the domain of the arguments and the number of arguemnts. A function ends with a period. A function over a particular domain of values is separated by a semicolon.

fact(0) -> 1;
fact(N) when is_integer(N) -> 
    fact(N-1)*N.

Advanced Syntax

Simple Types

Basic types in erlang include:

atom - alice
integer - 3
float - 3.1415
pid - a process id number <0.42.0>
list - [ things in square brackets ]
tuple - { things in curly braces }

Advanced Types

binary - a binary data block, <<42>>
function - a function, F = fun(X) -> X*X end.
port - a path for data to flow to the outside world
reference - a unique id over all processes
record - the standard erlang data structure

Modules

Adding/Replacing Modules

Erlang is picky about updating or replacing modules of the same name. You should completely remove the old module code from the directory tree, not just rename the containing directory.