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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Range-extraction/Erlang/range-extraction.erl Normal file
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-module( range ).
-export( [extraction/1, task/0] ).
extraction( [H | T] ) when is_integer(H) ->
Reversed_extracts = extraction_acc( lists:foldl(fun extraction/2, {H, []}, T) ),
string:join( lists:reverse(Reversed_extracts), "," ).
task() ->
io:fwrite( "~p~n", [extraction([0, 1, 2, 4, 6, 7, 8, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39])] ).
extraction( N, {Start, Acc} ) when N =:= Start + 1 -> {Start, N, Acc};
extraction( N, {Start, Acc} ) -> {N, extraction_acc( {Start, Acc} )};
extraction( N, {Start, Stop, Acc} ) when N =:= Stop + 1 -> {Start, N, Acc};
extraction( N, {Start, Stop, Acc} ) -> {N, extraction_acc( {Start, Stop, Acc} )}.
extraction_acc( {N, Acc} ) -> [erlang:integer_to_list(N) | Acc];
extraction_acc( {Start, Stop, Acc} ) when Stop > Start + 1 -> [erlang:integer_to_list(Start) ++ "-" ++ erlang:integer_to_list(Stop) | Acc];
extraction_acc( {Start, Stop, Acc} ) -> [erlang:integer_to_list(Stop), erlang:integer_to_list(Start) | Acc]. % Reversed