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gleam_stdlib
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retired
A standard library for the Gleam programming language
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Files
src/gleam@list.erl
-module(gleam@list).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function]).
-export([length/1, reverse/1, is_empty/1, contains/2, first/1, rest/1, filter/2, filter_map/2, map/2, map2/3, index_map/2, try_map/2, drop/2, take/2, new/0, append/2, prepend/2, concat/1, flatten/1, flat_map/2, fold/3, group/2, map_fold/3, fold_right/3, index_fold/3, try_fold/3, fold_until/3, find/2, find_map/2, all/2, any/2, zip/2, strict_zip/2, unzip/1, intersperse/2, at/2, unique/1, sort/2, range/2, repeat/2, split/2, split_while/2, key_find/2, key_filter/2, pop/2, pop_map/2, key_pop/2, key_set/3, each/2, try_each/2, partition/2, permutations/1, window/2, window_by_2/1, drop_while/2, take_while/2, chunk/2, sized_chunk/2, reduce/2, scan/3, last/1, combinations/2, combination_pairs/1, transpose/1, interleave/1, shuffle/1]).
-export_type([length_mismatch/0, continue_or_stop/1]).
-type length_mismatch() :: length_mismatch.
-type continue_or_stop(UD) :: {continue, UD} | {stop, UD}.
-spec length(list(any())) -> integer().
length(List) ->
erlang:length(List).
-spec reverse(list(UI)) -> list(UI).
reverse(Xs) ->
lists:reverse(Xs).
-spec is_empty(list(any())) -> boolean().
is_empty(List) ->
List =:= [].
-spec contains(list(UQ), UQ) -> boolean().
contains(List, Elem) ->
case List of
[] ->
false;
[First | _] when First =:= Elem ->
true;
[_ | Rest] ->
contains(Rest, Elem)
end.
-spec first(list(US)) -> {ok, US} | {error, nil}.
first(List) ->
case List of
[] ->
{error, nil};
[X | _] ->
{ok, X}
end.
-spec rest(list(UW)) -> {ok, list(UW)} | {error, nil}.
rest(List) ->
case List of
[] ->
{error, nil};
[_ | Xs] ->
{ok, Xs}
end.
-spec update_group(fun((VB) -> VC)) -> fun((gleam@dict:dict(VC, list(VB)), VB) -> gleam@dict:dict(VC, list(VB))).
update_group(F) ->
fun(Groups, Elem) -> case gleam@dict:get(Groups, F(Elem)) of
{ok, Existing} ->
gleam@dict:insert(Groups, F(Elem), [Elem | Existing]);
{error, _} ->
gleam@dict:insert(Groups, F(Elem), [Elem])
end end.
-spec do_filter(list(VP), fun((VP) -> boolean()), list(VP)) -> list(VP).
do_filter(List, Fun, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
New_acc = case Fun(X) of
true ->
[X | Acc];
false ->
Acc
end,
do_filter(Xs, Fun, New_acc)
end.
-spec filter(list(VT), fun((VT) -> boolean())) -> list(VT).
filter(List, Predicate) ->
do_filter(List, Predicate, []).
-spec do_filter_map(list(VW), fun((VW) -> {ok, VY} | {error, any()}), list(VY)) -> list(VY).
do_filter_map(List, Fun, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
New_acc = case Fun(X) of
{ok, X@1} ->
[X@1 | Acc];
{error, _} ->
Acc
end,
do_filter_map(Xs, Fun, New_acc)
end.
-spec filter_map(list(WE), fun((WE) -> {ok, WG} | {error, any()})) -> list(WG).
filter_map(List, Fun) ->
do_filter_map(List, Fun, []).
-spec do_map(list(WL), fun((WL) -> WN), list(WN)) -> list(WN).
do_map(List, Fun, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
do_map(Xs, Fun, [Fun(X) | Acc])
end.
-spec map(list(WQ), fun((WQ) -> WS)) -> list(WS).
map(List, Fun) ->
do_map(List, Fun, []).
-spec do_map2(list(XA), list(XC), fun((XA, XC) -> XE), list(XE)) -> list(XE).
do_map2(List1, List2, Fun, Acc) ->
case {List1, List2} of
{[], _} ->
reverse(Acc);
{_, []} ->
reverse(Acc);
{[A | As_], [B | Bs]} ->
do_map2(As_, Bs, Fun, [Fun(A, B) | Acc])
end.
-spec map2(list(WU), list(WW), fun((WU, WW) -> WY)) -> list(WY).
map2(List1, List2, Fun) ->
do_map2(List1, List2, Fun, []).
-spec do_index_map(list(XM), fun((integer(), XM) -> XO), integer(), list(XO)) -> list(XO).
do_index_map(List, Fun, Index, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
Acc@1 = [Fun(Index, X) | Acc],
do_index_map(Xs, Fun, Index + 1, Acc@1)
end.
-spec index_map(list(XR), fun((integer(), XR) -> XT)) -> list(XT).
index_map(List, Fun) ->
do_index_map(List, Fun, 0, []).
-spec do_try_map(list(XV), fun((XV) -> {ok, XX} | {error, XY}), list(XX)) -> {ok,
list(XX)} |
{error, XY}.
do_try_map(List, Fun, Acc) ->
case List of
[] ->
{ok, reverse(Acc)};
[X | Xs] ->
case Fun(X) of
{ok, Y} ->
do_try_map(Xs, Fun, [Y | Acc]);
{error, Error} ->
{error, Error}
end
end.
-spec try_map(list(YF), fun((YF) -> {ok, YH} | {error, YI})) -> {ok, list(YH)} |
{error, YI}.
try_map(List, Fun) ->
do_try_map(List, Fun, []).
-spec drop(list(YO), integer()) -> list(YO).
drop(List, N) ->
case N =< 0 of
true ->
List;
false ->
case List of
[] ->
[];
[_ | Xs] ->
drop(Xs, N - 1)
end
end.
-spec do_take(list(YR), integer(), list(YR)) -> list(YR).
do_take(List, N, Acc) ->
case N =< 0 of
true ->
reverse(Acc);
false ->
case List of
[] ->
reverse(Acc);
[X | Xs] ->
do_take(Xs, N - 1, [X | Acc])
end
end.
-spec take(list(YV), integer()) -> list(YV).
take(List, N) ->
do_take(List, N, []).
-spec new() -> list(any()).
new() ->
[].
-spec append(list(AAA), list(AAA)) -> list(AAA).
append(First, Second) ->
lists:append(First, Second).
-spec prepend(list(AAI), AAI) -> list(AAI).
prepend(List, Item) ->
[Item | List].
-spec reverse_and_prepend(list(AAL), list(AAL)) -> list(AAL).
reverse_and_prepend(Prefix, Suffix) ->
case Prefix of
[] ->
Suffix;
[First | Rest] ->
reverse_and_prepend(Rest, [First | Suffix])
end.
-spec do_concat(list(list(AAP)), list(AAP)) -> list(AAP).
do_concat(Lists, Acc) ->
case Lists of
[] ->
reverse(Acc);
[List | Further_lists] ->
do_concat(Further_lists, reverse_and_prepend(List, Acc))
end.
-spec concat(list(list(AAU))) -> list(AAU).
concat(Lists) ->
do_concat(Lists, []).
-spec flatten(list(list(AAY))) -> list(AAY).
flatten(Lists) ->
do_concat(Lists, []).
-spec flat_map(list(ABC), fun((ABC) -> list(ABE))) -> list(ABE).
flat_map(List, Fun) ->
_pipe = map(List, Fun),
concat(_pipe).
-spec fold(list(ABH), ABJ, fun((ABJ, ABH) -> ABJ)) -> ABJ.
fold(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
fold(Rest, Fun(Initial, X), Fun)
end.
-spec group(list(VJ), fun((VJ) -> VL)) -> gleam@dict:dict(VL, list(VJ)).
group(List, Key) ->
fold(List, gleam@dict:new(), update_group(Key)).
-spec map_fold(list(XH), XJ, fun((XJ, XH) -> {XJ, XK})) -> {XJ, list(XK)}.
map_fold(List, Acc, Fun) ->
_pipe = fold(
List,
{Acc, []},
fun(Acc@1, Item) ->
{Current_acc, Items} = Acc@1,
{Next_acc, Next_item} = Fun(Current_acc, Item),
{Next_acc, [Next_item | Items]}
end
),
gleam@pair:map_second(_pipe, fun reverse/1).
-spec fold_right(list(ABK), ABM, fun((ABM, ABK) -> ABM)) -> ABM.
fold_right(List, Initial, Fun) ->
case List of
[] ->
Initial;
[X | Rest] ->
Fun(fold_right(Rest, Initial, Fun), X)
end.
-spec do_index_fold(
list(ABN),
ABP,
fun((ABP, ABN, integer()) -> ABP),
integer()
) -> ABP.
do_index_fold(Over, Acc, With, Index) ->
case Over of
[] ->
Acc;
[First | Rest] ->
do_index_fold(Rest, With(Acc, First, Index), With, Index + 1)
end.
-spec index_fold(list(ABQ), ABS, fun((ABS, ABQ, integer()) -> ABS)) -> ABS.
index_fold(Over, Initial, Fun) ->
do_index_fold(Over, Initial, Fun, 0).
-spec try_fold(list(ABT), ABV, fun((ABV, ABT) -> {ok, ABV} | {error, ABW})) -> {ok,
ABV} |
{error, ABW}.
try_fold(Collection, Accumulator, Fun) ->
case Collection of
[] ->
{ok, Accumulator};
[First | Rest] ->
case Fun(Accumulator, First) of
{ok, Result} ->
try_fold(Rest, Result, Fun);
{error, _} = Error ->
Error
end
end.
-spec fold_until(list(ACB), ACD, fun((ACD, ACB) -> continue_or_stop(ACD))) -> ACD.
fold_until(Collection, Accumulator, Fun) ->
case Collection of
[] ->
Accumulator;
[First | Rest] ->
case Fun(Accumulator, First) of
{continue, Next_accumulator} ->
fold_until(Rest, Next_accumulator, Fun);
{stop, B} ->
B
end
end.
-spec find(list(ACF), fun((ACF) -> boolean())) -> {ok, ACF} | {error, nil}.
find(Haystack, Is_desired) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Is_desired(X) of
true ->
{ok, X};
_ ->
find(Rest, Is_desired)
end
end.
-spec find_map(list(ACJ), fun((ACJ) -> {ok, ACL} | {error, any()})) -> {ok, ACL} |
{error, nil}.
find_map(Haystack, Fun) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Fun(X) of
{ok, X@1} ->
{ok, X@1};
_ ->
find_map(Rest, Fun)
end
end.
-spec all(list(ACR), fun((ACR) -> boolean())) -> boolean().
all(List, Predicate) ->
case List of
[] ->
true;
[First | Rest] ->
case Predicate(First) of
true ->
all(Rest, Predicate);
false ->
false
end
end.
-spec any(list(ACT), fun((ACT) -> boolean())) -> boolean().
any(List, Predicate) ->
case List of
[] ->
false;
[First | Rest] ->
case Predicate(First) of
true ->
true;
false ->
any(Rest, Predicate)
end
end.
-spec do_zip(list(ACV), list(ACX), list({ACV, ACX})) -> list({ACV, ACX}).
do_zip(Xs, Ys, Acc) ->
case {Xs, Ys} of
{[X | Xs@1], [Y | Ys@1]} ->
do_zip(Xs@1, Ys@1, [{X, Y} | Acc]);
{_, _} ->
reverse(Acc)
end.
-spec zip(list(ADB), list(ADD)) -> list({ADB, ADD}).
zip(List, Other) ->
do_zip(List, Other, []).
-spec strict_zip(list(ADG), list(ADI)) -> {ok, list({ADG, ADI})} |
{error, length_mismatch()}.
strict_zip(List, Other) ->
case length(List) =:= length(Other) of
true ->
{ok, zip(List, Other)};
false ->
{error, length_mismatch}
end.
-spec do_unzip(list({ATA, ATB}), list(ATA), list(ATB)) -> {list(ATA), list(ATB)}.
do_unzip(Input, Xs, Ys) ->
case Input of
[] ->
{reverse(Xs), reverse(Ys)};
[{X, Y} | Rest] ->
do_unzip(Rest, [X | Xs], [Y | Ys])
end.
-spec unzip(list({ADR, ADS})) -> {list(ADR), list(ADS)}.
unzip(Input) ->
do_unzip(Input, [], []).
-spec do_intersperse(list(ADW), ADW, list(ADW)) -> list(ADW).
do_intersperse(List, Separator, Acc) ->
case List of
[] ->
reverse(Acc);
[X | Rest] ->
do_intersperse(Rest, Separator, [X, Separator | Acc])
end.
-spec intersperse(list(AEA), AEA) -> list(AEA).
intersperse(List, Elem) ->
case List of
[] ->
List;
[_] ->
List;
[X | Rest] ->
do_intersperse(Rest, Elem, [X])
end.
-spec at(list(AED), integer()) -> {ok, AED} | {error, nil}.
at(List, Index) ->
case Index >= 0 of
true ->
_pipe = List,
_pipe@1 = drop(_pipe, Index),
first(_pipe@1);
false ->
{error, nil}
end.
-spec unique(list(AEH)) -> list(AEH).
unique(List) ->
case List of
[] ->
[];
[X | Rest] ->
[X | unique(filter(Rest, fun(Y) -> Y /= X end))]
end.
-spec merge_up(
integer(),
integer(),
list(AEK),
list(AEK),
list(AEK),
fun((AEK, AEK) -> gleam@order:order())
) -> list(AEK).
merge_up(Na, Nb, A, B, Acc, Compare) ->
case {Na, Nb, A, B} of
{0, 0, _, _} ->
Acc;
{_, 0, [Ax | Ar], _} ->
merge_up(Na - 1, Nb, Ar, B, [Ax | Acc], Compare);
{0, _, _, [Bx | Br]} ->
merge_up(Na, Nb - 1, A, Br, [Bx | Acc], Compare);
{_, _, [Ax@1 | Ar@1], [Bx@1 | Br@1]} ->
case Compare(Ax@1, Bx@1) of
gt ->
merge_up(Na, Nb - 1, A, Br@1, [Bx@1 | Acc], Compare);
_ ->
merge_up(Na - 1, Nb, Ar@1, B, [Ax@1 | Acc], Compare)
end;
{_, _, _, _} ->
Acc
end.
-spec merge_down(
integer(),
integer(),
list(AEP),
list(AEP),
list(AEP),
fun((AEP, AEP) -> gleam@order:order())
) -> list(AEP).
merge_down(Na, Nb, A, B, Acc, Compare) ->
case {Na, Nb, A, B} of
{0, 0, _, _} ->
Acc;
{_, 0, [Ax | Ar], _} ->
merge_down(Na - 1, Nb, Ar, B, [Ax | Acc], Compare);
{0, _, _, [Bx | Br]} ->
merge_down(Na, Nb - 1, A, Br, [Bx | Acc], Compare);
{_, _, [Ax@1 | Ar@1], [Bx@1 | Br@1]} ->
case Compare(Bx@1, Ax@1) of
lt ->
merge_down(Na - 1, Nb, Ar@1, B, [Ax@1 | Acc], Compare);
_ ->
merge_down(Na, Nb - 1, A, Br@1, [Bx@1 | Acc], Compare)
end;
{_, _, _, _} ->
Acc
end.
-spec merge_sort(
list(AEU),
integer(),
fun((AEU, AEU) -> gleam@order:order()),
boolean()
) -> list(AEU).
merge_sort(L, Ln, Compare, Down) ->
N = Ln div 2,
A = L,
B = drop(L, N),
case Ln < 3 of
true ->
case Down of
true ->
merge_down(N, Ln - N, A, B, [], Compare);
false ->
merge_up(N, Ln - N, A, B, [], Compare)
end;
false ->
case Down of
true ->
merge_down(
N,
Ln - N,
merge_sort(A, N, Compare, false),
merge_sort(B, Ln - N, Compare, false),
[],
Compare
);
false ->
merge_up(
N,
Ln - N,
merge_sort(A, N, Compare, true),
merge_sort(B, Ln - N, Compare, true),
[],
Compare
)
end
end.
-spec sort(list(AEX), fun((AEX, AEX) -> gleam@order:order())) -> list(AEX).
sort(List, Compare) ->
merge_sort(List, length(List), Compare, true).
-spec tail_recursive_range(integer(), integer(), list(integer())) -> list(integer()).
tail_recursive_range(Start, Stop, Acc) ->
case gleam@int:compare(Start, Stop) of
eq ->
[Stop | Acc];
gt ->
tail_recursive_range(Start, Stop + 1, [Stop | Acc]);
lt ->
tail_recursive_range(Start, Stop - 1, [Stop | Acc])
end.
-spec range(integer(), integer()) -> list(integer()).
range(Start, Stop) ->
tail_recursive_range(Start, Stop, []).
-spec do_repeat(AFD, integer(), list(AFD)) -> list(AFD).
do_repeat(A, Times, Acc) ->
case Times =< 0 of
true ->
Acc;
false ->
do_repeat(A, Times - 1, [A | Acc])
end.
-spec repeat(AFG, integer()) -> list(AFG).
repeat(A, Times) ->
do_repeat(A, Times, []).
-spec do_split(list(AFI), integer(), list(AFI)) -> {list(AFI), list(AFI)}.
do_split(List, N, Taken) ->
case N =< 0 of
true ->
{reverse(Taken), List};
false ->
case List of
[] ->
{reverse(Taken), []};
[X | Xs] ->
do_split(Xs, N - 1, [X | Taken])
end
end.
-spec split(list(AFN), integer()) -> {list(AFN), list(AFN)}.
split(List, Index) ->
do_split(List, Index, []).
-spec do_split_while(list(AFR), fun((AFR) -> boolean()), list(AFR)) -> {list(AFR),
list(AFR)}.
do_split_while(List, F, Acc) ->
case List of
[] ->
{reverse(Acc), []};
[X | Xs] ->
case F(X) of
false ->
{reverse(Acc), List};
_ ->
do_split_while(Xs, F, [X | Acc])
end
end.
-spec split_while(list(AFW), fun((AFW) -> boolean())) -> {list(AFW), list(AFW)}.
split_while(List, Predicate) ->
do_split_while(List, Predicate, []).
-spec key_find(list({AGA, AGB}), AGA) -> {ok, AGB} | {error, nil}.
key_find(Keyword_list, Desired_key) ->
find_map(
Keyword_list,
fun(Keyword) ->
{Key, Value} = Keyword,
case Key =:= Desired_key of
true ->
{ok, Value};
false ->
{error, nil}
end
end
).
-spec key_filter(list({AGF, AGG}), AGF) -> list(AGG).
key_filter(Keyword_list, Desired_key) ->
filter_map(
Keyword_list,
fun(Keyword) ->
{Key, Value} = Keyword,
case Key =:= Desired_key of
true ->
{ok, Value};
false ->
{error, nil}
end
end
).
-spec do_pop(list(AWT), fun((AWT) -> boolean()), list(AWT)) -> {ok,
{AWT, list(AWT)}} |
{error, nil}.
do_pop(Haystack, Predicate, Checked) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Predicate(X) of
true ->
{ok, {X, append(reverse(Checked), Rest)}};
false ->
do_pop(Rest, Predicate, [X | Checked])
end
end.
-spec pop(list(AGN), fun((AGN) -> boolean())) -> {ok, {AGN, list(AGN)}} |
{error, nil}.
pop(Haystack, Is_desired) ->
do_pop(Haystack, Is_desired, []).
-spec do_pop_map(list(AXH), fun((AXH) -> {ok, AXU} | {error, any()}), list(AXH)) -> {ok,
{AXU, list(AXH)}} |
{error, nil}.
do_pop_map(Haystack, Mapper, Checked) ->
case Haystack of
[] ->
{error, nil};
[X | Rest] ->
case Mapper(X) of
{ok, Y} ->
{ok, {Y, append(reverse(Checked), Rest)}};
{error, _} ->
do_pop_map(Rest, Mapper, [X | Checked])
end
end.
-spec pop_map(list(AGW), fun((AGW) -> {ok, AGY} | {error, any()})) -> {ok,
{AGY, list(AGW)}} |
{error, nil}.
pop_map(Haystack, Is_desired) ->
do_pop_map(Haystack, Is_desired, []).
-spec key_pop(list({AHF, AHG}), AHF) -> {ok, {AHG, list({AHF, AHG})}} |
{error, nil}.
key_pop(Haystack, Key) ->
pop_map(
Haystack,
fun(Entry) ->
{K, V} = Entry,
case K of
K@1 when K@1 =:= Key ->
{ok, V};
_ ->
{error, nil}
end
end
).
-spec key_set(list({AHL, AHM}), AHL, AHM) -> list({AHL, AHM}).
key_set(List, Key, Value) ->
case List of
[] ->
[{Key, Value}];
[{K, _} | Rest] when K =:= Key ->
[{Key, Value} | Rest];
[First | Rest@1] ->
[First | key_set(Rest@1, Key, Value)]
end.
-spec each(list(AHP), fun((AHP) -> any())) -> nil.
each(List, F) ->
case List of
[] ->
nil;
[X | Xs] ->
F(X),
each(Xs, F)
end.
-spec try_each(list(AHS), fun((AHS) -> {ok, any()} | {error, AHV})) -> {ok, nil} |
{error, AHV}.
try_each(List, Fun) ->
case List of
[] ->
{ok, nil};
[X | Xs] ->
case Fun(X) of
{ok, _} ->
try_each(Xs, Fun);
{error, E} ->
{error, E}
end
end.
-spec do_partition(list(AZB), fun((AZB) -> boolean()), list(AZB), list(AZB)) -> {list(AZB),
list(AZB)}.
do_partition(List, Categorise, Trues, Falses) ->
case List of
[] ->
{reverse(Trues), reverse(Falses)};
[X | Xs] ->
case Categorise(X) of
true ->
do_partition(Xs, Categorise, [X | Trues], Falses);
false ->
do_partition(Xs, Categorise, Trues, [X | Falses])
end
end.
-spec partition(list(AIF), fun((AIF) -> boolean())) -> {list(AIF), list(AIF)}.
partition(List, Categorise) ->
do_partition(List, Categorise, [], []).
-spec permutations(list(AIJ)) -> list(list(AIJ)).
permutations(L) ->
case L of
[] ->
[[]];
_ ->
_pipe = L,
_pipe@5 = index_map(_pipe, fun(I_idx, I) -> _pipe@1 = L,
_pipe@2 = index_fold(
_pipe@1,
[],
fun(Acc, J, J_idx) -> case I_idx =:= J_idx of
true ->
Acc;
false ->
[J | Acc]
end end
),
_pipe@3 = reverse(_pipe@2),
_pipe@4 = permutations(_pipe@3),
map(_pipe@4, fun(Permutation) -> [I | Permutation] end) end),
concat(_pipe@5)
end.
-spec do_window(list(list(AIN)), list(AIN), integer()) -> list(list(AIN)).
do_window(Acc, L, N) ->
Window = take(L, N),
case length(Window) =:= N of
true ->
do_window([Window | Acc], drop(L, 1), N);
false ->
Acc
end.
-spec window(list(AIT), integer()) -> list(list(AIT)).
window(L, N) ->
_pipe = do_window([], L, N),
reverse(_pipe).
-spec window_by_2(list(AIX)) -> list({AIX, AIX}).
window_by_2(L) ->
zip(L, drop(L, 1)).
-spec drop_while(list(AJA), fun((AJA) -> boolean())) -> list(AJA).
drop_while(List, Predicate) ->
case List of
[] ->
[];
[X | Xs] ->
case Predicate(X) of
true ->
drop_while(Xs, Predicate);
false ->
[X | Xs]
end
end.
-spec do_take_while(list(AJD), fun((AJD) -> boolean()), list(AJD)) -> list(AJD).
do_take_while(List, Predicate, Acc) ->
case List of
[] ->
reverse(Acc);
[First | Rest] ->
case Predicate(First) of
true ->
do_take_while(Rest, Predicate, [First | Acc]);
false ->
reverse(Acc)
end
end.
-spec take_while(list(AJH), fun((AJH) -> boolean())) -> list(AJH).
take_while(List, Predicate) ->
do_take_while(List, Predicate, []).
-spec do_chunk(list(AJK), fun((AJK) -> AJM), AJM, list(AJK), list(list(AJK))) -> list(list(AJK)).
do_chunk(List, F, Previous_key, Current_chunk, Acc) ->
case List of
[First | Rest] ->
Key = F(First),
case Key =:= Previous_key of
false ->
New_acc = [reverse(Current_chunk) | Acc],
do_chunk(Rest, F, Key, [First], New_acc);
_ ->
do_chunk(Rest, F, Key, [First | Current_chunk], Acc)
end;
_ ->
reverse([reverse(Current_chunk) | Acc])
end.
-spec chunk(list(AJS), fun((AJS) -> any())) -> list(list(AJS)).
chunk(List, F) ->
case List of
[] ->
[];
[First | Rest] ->
do_chunk(Rest, F, F(First), [First], [])
end.
-spec do_sized_chunk(
list(AJX),
integer(),
integer(),
list(AJX),
list(list(AJX))
) -> list(list(AJX)).
do_sized_chunk(List, Count, Left, Current_chunk, Acc) ->
case List of
[] ->
case Current_chunk of
[] ->
reverse(Acc);
Remaining ->
reverse([reverse(Remaining) | Acc])
end;
[First | Rest] ->
Chunk = [First | Current_chunk],
case Left > 1 of
false ->
do_sized_chunk(
Rest,
Count,
Count,
[],
[reverse(Chunk) | Acc]
);
true ->
do_sized_chunk(Rest, Count, Left - 1, Chunk, Acc)
end
end.
-spec sized_chunk(list(AKE), integer()) -> list(list(AKE)).
sized_chunk(List, Count) ->
do_sized_chunk(List, Count, Count, [], []).
-spec reduce(list(AKI), fun((AKI, AKI) -> AKI)) -> {ok, AKI} | {error, nil}.
reduce(List, Fun) ->
case List of
[] ->
{error, nil};
[First | Rest] ->
{ok, fold(Rest, First, Fun)}
end.
-spec do_scan(list(AKM), AKO, list(AKO), fun((AKO, AKM) -> AKO)) -> list(AKO).
do_scan(List, Accumulator, Accumulated, Fun) ->
case List of
[] ->
reverse(Accumulated);
[X | Xs] ->
Next = Fun(Accumulator, X),
do_scan(Xs, Next, [Next | Accumulated], Fun)
end.
-spec scan(list(AKR), AKT, fun((AKT, AKR) -> AKT)) -> list(AKT).
scan(List, Initial, Fun) ->
do_scan(List, Initial, [], Fun).
-spec last(list(AKV)) -> {ok, AKV} | {error, nil}.
last(List) ->
_pipe = List,
reduce(_pipe, fun(_, Elem) -> Elem end).
-spec combinations(list(AKZ), integer()) -> list(list(AKZ)).
combinations(Items, N) ->
case N of
0 ->
[[]];
_ ->
case Items of
[] ->
[];
[X | Xs] ->
First_combinations = begin
_pipe = map(
combinations(Xs, N - 1),
fun(Com) -> [X | Com] end
),
reverse(_pipe)
end,
fold(
First_combinations,
combinations(Xs, N),
fun(Acc, C) -> [C | Acc] end
)
end
end.
-spec do_combination_pairs(list(ALD)) -> list(list({ALD, ALD})).
do_combination_pairs(Items) ->
case Items of
[] ->
[];
[X | Xs] ->
First_combinations = map(Xs, fun(Other) -> {X, Other} end),
[First_combinations | do_combination_pairs(Xs)]
end.
-spec combination_pairs(list(ALH)) -> list({ALH, ALH}).
combination_pairs(Items) ->
_pipe = do_combination_pairs(Items),
concat(_pipe).
-spec transpose(list(list(ALO))) -> list(list(ALO)).
transpose(List_of_list) ->
Take_first = fun(List) -> case List of
[] ->
[];
[F] ->
[F];
[F@1 | _] ->
[F@1]
end end,
case List_of_list of
[] ->
[];
[[] | Xss] ->
transpose(Xss);
Rows ->
Firsts = begin
_pipe = Rows,
_pipe@1 = map(_pipe, Take_first),
concat(_pipe@1)
end,
Rest = transpose(map(Rows, fun(_capture) -> drop(_capture, 1) end)),
[Firsts | Rest]
end.
-spec interleave(list(list(ALK))) -> list(ALK).
interleave(List) ->
_pipe = transpose(List),
concat(_pipe).
-spec do_shuffle_pair_unwrap(list({float(), ALT}), list(ALT)) -> list(ALT).
do_shuffle_pair_unwrap(List, Acc) ->
case List of
[] ->
Acc;
[Elem_pair | Enumerable] ->
do_shuffle_pair_unwrap(
Enumerable,
[erlang:element(2, Elem_pair) | Acc]
)
end.
-spec do_shuffle_by_pair_indexes(list({float(), ALX})) -> list({float(), ALX}).
do_shuffle_by_pair_indexes(List_of_pairs) ->
sort(
List_of_pairs,
fun(A_pair, B_pair) ->
gleam@float:compare(
erlang:element(1, A_pair),
erlang:element(1, B_pair)
)
end
).
-spec shuffle(list(AMA)) -> list(AMA).
shuffle(List) ->
_pipe = List,
_pipe@1 = fold(
_pipe,
[],
fun(Acc, A) -> [{gleam@float:random(+0.0, 1.0), A} | Acc] end
),
_pipe@2 = do_shuffle_by_pair_indexes(_pipe@1),
do_shuffle_pair_unwrap(_pipe@2, []).