Index - Erlang/OTP

fact(0) -> 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

Erlang.org planned downtime March 13, 2025 by Henrik Nord: Erlang.org webpage will be down
Erlang/OTP 27.3 Release March 05, 2025 by Björn Gustavsson: Erlang/OTP 27.3 is the second maintenance patch package for OTP 27, with mostly bug fixes.
Erlang/OTP 28.0 Release Candidate 1 February 12, 2025 by Björn Gustavsson: Erlang/OTP 28.0-rc1 is the first release candidate for OTP 28

Practical functional programming
for a parallel world

What is Erlang?

What is OTP?

News

Erlang.org planned downtime

Erlang/OTP 27.3 Release

Erlang/OTP 28.0 Release Candidate 1

Participate

Practical functional programming for a parallel world

What is Erlang?

What is OTP?

News

Erlang.org planned downtime

Erlang/OTP 27.3 Release

Erlang/OTP 28.0 Release Candidate 1

Participate

Practical functional programming
for a parallel world