「サイコロを転がす」をErlangで(横へな12) ref: http://qiita.com/pazworld/items/53d3bf2ca4216cae27f0

dice.erl

-module(dice).
-export([tests/0, test/2, solve/1]).

solve(Data) ->
  {_Dice, L} = lists:foldl(fun rotate_add/2, {{1,2,3}, [1]}, Data),
  [Digit + $0 || Digit <- lists:reverse(L)].

rotate_add(Dir, {Dice, L}) ->
  NewDice = rotate(Dir, Dice),
  {NewDice, [element(1, NewDice) | L]}.

rotate($N, {Face, Upper, Left}) -> {7 - Upper, Face, Left};
rotate($S, {Face, Upper, Left}) -> {Upper, 7 - Face, Left};
rotate($W, {Face, Upper, Left}) -> {7 - Left, Upper, Face};
rotate($E, {Face, Upper, Left}) -> {Left, Upper, 7 - Face}.

tests() ->
  test("NNESWWS", "15635624"), %0
  test("EEEE", "13641"), %1
  test("WWWW", "14631"), %2
  test("SSSS", "12651"), %3
  test("NNNN", "15621"), %4
  test("EENN", "13651"), %5
  test("WWNN", "14651"), %6
  test("SSNN", "12621"), %7
  test("NENNN", "153641"), %8
  test("NWNNN", "154631"), %9
  test("SWWWSNEEEN", "12453635421"), %10
  test("SENWSWSNSWE", "123123656545"), %11
  test("SSSWNNNE", "126546315"), %12
  test("SWNWSSSWWE", "12415423646"), %13
  test("ENNWWS", "1354135"), %14
  test("ESWNNW", "1321365"), %15
  test("NWSSE", "154135"), %16
  test("SWNWEWSEEN", "12415154135"), %17
  test("EWNWEEEEWN", "13154532426"), %18
  test("WNEWEWWWSNW", "145151562421"), %19
  test("NNEE", "15631"), %20
  test("EEEEWNWSW", "1364145642"), %21
  test("SENNWWES", "123142321"), %22
  test("SWWWSNSNESWW", "1245363635631"), %23
  test("WESSENSE", "141263231"), %24
  test("SWNSSESESSS", "124146231562"), %25
  test("ENS", "1353"), %26
  test("WNN", "1453"), %27
  test("SSEENEEEN", "1263124536"), %28
  test("NWSNNNW", "15414632"), %29
  test("ESSSSSWW", "132453215"), %30
  test("ESE", "1326"), %31
  test("SNWNWWNSSSS", "121456232453"), %32
  test("SWEESEN", "12423653"), %33
  test("NEEWNSSWWW", "15323631562"), %34
  test("WSEW", "14212"), %35
  test("SWSNNNSNWE", "12464131353"), %36
  test("ENWEWSEEW", "1351513545"), %37
  test("WSEWN", "142124"), %38
  test("EWNEESEWE", "1315321414"), %39
  test("NESEEN", "1531263"), %40
  test("WSW", "1426"), %41
  test("ENEWE", "135656"). %42

test(Data, Expected) ->
  Result = solve(Data),
  OkNg = case Result =:= Expected of
    true -> ok;
    false -> ng
  end,
  io:fwrite("~w: ~s -> ~s~n", [OkNg, Data, Result]).