Erlang (programming language)/Tutorials

Erlang Language Programming Tutorials

Basic Erlang

Terms

Pattern Matching

Expressions

Functions

Guards

Modules

Errors

Processes and Messages

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.

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
• 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

Popular Modules

lists

regexp: Regular Expressions

Example programs

Hello World (Serial)

Hello World (parallel)

Prime Sieve with Linda

Autonomous Agents in Erlang -- def: Autonomous Agent.

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