Index - Erlang/OTP

fact(1) -> 1; %% Pattern matching for control-flow fact(N) -> N * fact(N-1). %% Recursion to create loops > example:fact(10). %% Interactive shell for fast iterations 3628800 > [{I, example:fact(I)} || I <- lists:seq(1,10)]. [{1, 1}, {2, 2}, {3, 6}, {4, 24}, {5, 120}, {6, 720}, {7, 5040}, {8, 40320}, {9, 362880}, {10, 3628800}]

> Fruits = ["banana","monkey","jungle"]. %% Immutable variables ["banana","monkey","jungle"] > lists:map(fun string:uppercase/1, Fruits). %% Map values using stdlib functions ["BANANA","MONKEY","JUNGLE"] %% Fold over lists using custom functions > lists:foldl(fun(Str, Cnt) -> string:length(Str) + Cnt end, 0, Fruits). 18

> Parent = self(). %% Get own process id <0.376.0> > Child = spawn(fun() -> receive go -> Parent ! lists:seq(1,100) end end). <0.930.0> > Child ! go. %% Send message to child go > receive Reply -> Reply end. %% Receive response from child [1,2,3,4,5,6,7,8,9,10,11|...]

-spec even(list(integer())) -> list(integer()). even(Numbers) -> mapreduce(Numbers, fun(Number) -> Number rem 2 == 0 end). mapreduce(Numbers, Function) -> Parent = self(), [spawn(fun() -> Parent ! {Number, Function(Number)} end) || Number <- Numbers], lists:flatten( [receive {Number, true} -> Number; _ -> [] end || Number <- Numbers]).

What is Erlang?

Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Some of its uses are in telecoms, banking, e-commerce, computer telephony and instant messaging. Erlang's runtime system has built-in support for concurrency, distribution and fault tolerance.

Erlang Quickstart

What is OTP?

OTP is set of Erlang libraries and design principles providing middle-ware to develop these systems. It includes its own distributed database, applications to interface towards other languages, debugging and release handling tools.

Getting Started with OTP

News

OTP 25 Release candidate 1 February 16, 2022 by Kenneth Lundin: Erlang/OTP 25 rc1 is the first release candidate of three before the OTP 25.0 release.
OTP 24.2 Release December 15, 2021 by Kenneth Lundin: Erlang/OTP 24.2 is the second maintenance patch release for OTP 24, with mostly bug fixes as well as a few improvements.
The Many-to-One Parallel Signal Sending Optimization November 05, 2021 by Kjell Winblad: This blog post discusses the parallel signal sending optimization that recently got merged into the master branch (scheduled to be included in Erlang/OTP 25). The optimization improves signal sending throughput when several processes send signals ...

Practical functional programming
for a parallel world

What is Erlang?

What is OTP?

News

OTP 25 Release candidate 1

OTP 24.2 Release

The Many-to-One Parallel Signal Sending Optimization

Participate

Practical functional programming for a parallel world

What is Erlang?

What is OTP?

News

OTP 25 Release candidate 1

OTP 24.2 Release

The Many-to-One Parallel Signal Sending Optimization

Participate

Practical functional programming
for a parallel world