An Open Challenge

[wtd]

For those looking for a language to learn who aren't enthralled with nostalgia by my recent C and Pascal tours, give Erlang a try.

My first Erlang program:

code:

-module(hello). -export([hello/1]). -import(io). hello(Name) ->    io:format("Hello, ~s!~n", [Name]).

This was tested in the interpreter with:

code:

1> c(hello). {ok,hello} 2> hello:hello("wtd"). Hello, wtd! ok

And a modification that uses pattern matching:

code:

-module(hello). -export([hello/1]). -import(io). hello("wtd") ->    io:format("That cur!~n", []) ; hello(Name) ->    io:format("Hello, ~s!~n", [Name]).

A little more pattern matching, and recursion:

code:

-module(hello). -export([hello/1, greet/2]). -import(io). hello("wtd") ->    io:format("That cur!~n", []) ; hello(Name) ->    io:format("Hello, ~s!~n", [Name]). greet(_, []) ->    {ok} ; greet(Greeting, ["wtd"|Rest]) ->    hello("wtd") ,    greet(Greeting, Rest) ; greet(Greeting, [First|Rest]) ->    io:format("~s, ~s!~n", [Greeting, First]) ,    greet(Greeting, Rest).

Some first-class functions:

code:

Factorial = fun(N) ->                lists:foldl(fun(A, B) ->                               A * B                            end,                            1, lists:seq(1, N))                end.