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

Fast random integers May 12, 2022 by Raimo Niskanen: When you need “random” integers, and it is essential to generate them fast and cheap; then maybe the full featured Pseudo Random Number Generators in the rand module are overkill. This blog post will dive in to new additions to the said module, ho...
Type-Based Optimizations in the JIT April 26, 2022 by Björn Gustavsson: This post explores the new type-based optimizations in Erlang/OTP 25 where the compiler embeds type information in the BEAM files to help the JIT (Just-In-Time compiler) to generate better code.
OTP 25 Release candidate 3 April 13, 2022 by Henrik Nord: Erlang/OTP 25 rc3 is the third and final release candidate before the OTP 25.0 release.

Practical functional programming
for a parallel world

What is Erlang?

What is OTP?

News

Fast random integers

Type-Based Optimizations in the JIT

OTP 25 Release candidate 3

Participate

Practical functional programming for a parallel world

What is Erlang?

What is OTP?

News

Fast random integers

Type-Based Optimizations in the JIT

OTP 25 Release candidate 3

Participate

Practical functional programming
for a parallel world