Erlang (programming language)/Tutorials: Difference between revisions

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imported>Eric Evers
imported>Eric Evers
Line 28: Line 28:
  fact(N) when is_integer(N) ->  
  fact(N) when is_integer(N) ->  
     fact(N-1)*N.
     fact(N-1)*N.
:[[Erlang_programming_language/Tutorials/Advanced_syntax|Advanced Syntax]]


==Simple Types==
==Simple Types==

Revision as of 18:29, 1 September 2008

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Tutorials relating to the topic of Erlang (programming language).

Erlang Language Programming Tutorials

Overview

Basic Erlang

Get to know the Command Line
Terms
Pattern Matching
Expressions
Functions
Guards
Modules
Errors
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.

Popular Modules

math
lists
regexp: Regular Expressions

Example programs

Hello World (Serial)
Hello World (parallel)
Prime Sieve with Linda
Autonomous Agents in Erlang -- def: Autonomous Agent.

Advanced OTP

Databases

ETS programming
DETS programming
Mnesia database

Mnesia

Advanced Erlang

Making parsers with yecc
Evaluation

Projects using erlang

  • CouchDB - a scalable database for Apache
  • Wings3D - a 3-D editor

References

1 - Erlang Man Pages at Erlang,org