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# Erlang Cheatsheet

## Overview of unique features

- Functional programming language
- Designed for building concurrent and distributed systems
- Uses lightweight processes instead of threads
- Supports hot-swapping of code
- Can be used for building telecom and messaging systems

## Variables

% Declare a variable

X = 42.

% Declare a constant

- define(Y, 10).

% Declare a tuple

MyTuple = {apple, 3}.

% Declare a list

MyList = [1, 2, 3].

## Functions

% Define a function

add(X, Y) ->

X + Y.

% Call a function

Result = add(3, 4).

## Loops

% Define a loop

my_loop(I) ->

case I > 10 of

true -> done;

false -> my_loop(I + 1)

end.

## Conditionals

% Define an if-else statement

max(X, Y) ->

if X > Y ->

X;

true ->

Y

end.

## Processes

% Define a process

my_process() ->

receive

{From, Message} ->

From ! {ok, Message},

my_process()

end.

% Start a process

Pid = spawn(my_module, my_process, []).

% Send a message to a process

Pid ! {self(), "hello"}.

% Receive a message from a process

receive

{ok, Message} -> io:format("Received ~p", [Message])

end.

## Resources

- [Erlang documentation](https://www.erlang.org/docs)
- [Erlang tutorial](https://learnyousomeerlang.com/content)
- [Erlang forum](https://stackoverflow.com/questions/tagged/erlang) for community support and troubleshooting.