Erlang is an open source programming language created in 1986 by Joe Armstrong and Robert Virding and Mike Williams.
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Erlang ( ER-lang) is a general-purpose, concurrent, functional programming language, as well as a garbage-collected runtime system. The term Erlang is used interchangeably with Erlang/OTP, or OTP, which consists of the Erlang runtime system, a number of ready-to-use components mainly written in Erlang, and a set of design principles for Erlang programs. The Erlang runtime system is known for its designs that are well suited for systems with the following characteristics: Distributed Fault-tolerant Soft real-time, Highly available, non-stop applications Hot swapping, where code can be changed without stopping a system. Read more on Wikipedia...
-module(square).
-export([square/1]).
square(A) -> A*A.
-module(main).
-export([main/0]).
main() ->
io:fwrite("Hello, world!\n").
-module(erlang_hw).
-export([start/0]).
start() ->
io:format("Hello World~n").%% Hello World in Erlang
-module(hello).
-export([hello/0]).
hello() ->
io:format("Hello World!~n", []).
#!/usr/bin/env escript
-export([main/1]).
main([]) -> io:format("Hello, World!~n").
%% Second version
-module(counter).
-export([start/0, codeswitch/1]).
start() -> loop(0).
loop(Sum) ->
receive
{increment, Count} ->
loop(Sum+Count);
reset ->
loop(0);
{counter, Pid} ->
Pid ! {counter, Sum},
loop(Sum);
code_switch ->
?MODULE:codeswitch(Sum)
end.
codeswitch(Sum) -> loop(Sum).after and andalso begin bnot bor bsl bsr bxor case catch cond div end fun if let not of or orelse receive rem try when xor| Feature | Supported | Token | Example |
|---|---|---|---|
| Integers | ✓ | % [+-]?(?:[2-9]|[12][0-9]|3[0-6])#[0-9a-zA-Z]+ |
|
| Floats | ✓ | % [+-]?\d+.\d+ |
|
| Conditionals | ✓ | ||
| Functions | ✓ | ||
| Print() Debugging | ✓ | io:format | |
| Message Passing | ✓ | ||
| Line Comments | ✓ | % | % A comment |
| Macros | ✓ | -define(Const, Replacement). -define(Func(Var1,...,VarN), Replacement). |
|
| hasExports | ✓ | -export([start/0, codeswitch/1]). |
|
| File Imports | ✓ | -include("my_records.hrl").
-include("incdir/my_records.hrl").
-include("/home/user/proj/my_records.hrl").
-include("$PROJ_ROOT/my_records.hrl").
-include_lib("kernel/include/file.hrl"). |
|
| Directives | ✓ | -define(TIMEOUT, 200). ... call(Request) -> server:call(refserver, Request, ?TIMEOUT). -undef(Macro). |
|
| Comments | ✓ | % hello world program |
|
| Shebang | ✓ | #!/usr/bin/env escript |
|
| Strings | ✓ | "hello world" |
|
| Case Insensitive Identifiers | X | ||
| Semantic Indentation | X | ||
| MultiLine Comments | X |