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gleam_stdlib

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A standard library for the Gleam programming language

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gleam_stdlib gen src gleam@set.erl
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gen/src/gleam@set.erl 

-module(gleam@set).

-compile(no_auto_import).



-export([new/0, size/1, insert/2, contains/2, delete/2, to_list/1, from_list/1, fold/3, filter/2, take/2, union/2, intersection/2]).



new() ->

    {set, gleam@map:new()}.



size(Set) ->

    gleam@map:size(erlang:element(2, Set)).



insert(Set, Member) ->

    {set, gleam@map:insert(erlang:element(2, Set), Member, [])}.



contains(Set, Member) ->

    gleam@result:is_ok(gleam@map:get(erlang:element(2, Set), Member)).



delete(Set, Member) ->

    {set, gleam@map:delete(erlang:element(2, Set), Member)}.



to_list(Set) ->

    gleam@map:keys(erlang:element(2, Set)).



from_list(Members) ->

    Map = gleam@list:fold(

        Members,

        gleam@map:new(),

        fun(K, M) -> gleam@map:insert(M, K, []) end

    ),

    {set, Map}.



fold(Set, Initial, Reducer) ->

    gleam@map:fold(

        erlang:element(2, Set),

        Initial,

        fun(K, _, A) -> Reducer(K, A) end

    ).



filter(Set, Property) ->

    {set,

     gleam@map:filter(erlang:element(2, Set), fun(M, _) -> Property(M) end)}.



take(Set, Desired) ->

    {set, gleam@map:take(erlang:element(2, Set), Desired)}.



order(First, Second) ->

    case gleam@map:size(erlang:element(2, First))

    > gleam@map:size(erlang:element(2, Second)) of

        true ->

            {First, Second};



        false ->

            {Second, First}

    end.



union(First, Second) ->

    {Larger, Smaller} = order(First, Second),

    fold(Smaller, Larger, fun(M, A) -> insert(A, M) end).



intersection(First, Second) ->

    {Larger, Smaller} = order(First, Second),

    take(Larger, to_list(Smaller)).