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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

Announcing the new Erlang Forums September 21, 2021 by Kenneth Lundin: We are pleased to announce the launch of the brand new Erlang Forums.
OTP 24.1 Release September 21, 2021 by Kenneth Lundin: Erlang/OTP 24.1 is the first maintenance patch release for OTP 24, with mostly bug fixes as well as a few improvements.
Decentralized ETS Counters for Better Scalability August 03, 2021 by Kjell Winblad: A shared Erlang Term Storage (ETS) table is often an excellent place to store data that is updated and read from multiple Erlang processes frequently. ETS provides key-value stores to Erlang processes. When the write_concurrency option is activate...

Practical functional programming
for a parallel world

What is Erlang?

What is OTP?

News

Announcing the new Erlang Forums

OTP 24.1 Release

Decentralized ETS Counters for Better Scalability

Participate

Practical functional programming for a parallel world

What is Erlang?

What is OTP?

News

Announcing the new Erlang Forums

OTP 24.1 Release

Decentralized ETS Counters for Better Scalability

Participate

Practical functional programming
for a parallel world