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-module(maps_match_and_update_literals).
-export([test/0]).
test() ->
Map = #{x=>0,y=>"untouched",z=>"also untouched",q=>1},
#{x:=16,q:=21,y:="untouched",z:="also untouched"} = loop_match_and_update_literals_x_q(Map, [
{1,2},{3,4},{5,6},{7,8}
]),
M0 = id(#{ "hi" => "hello", int => 3, <<"key">> => <<"value">>,
4 => number, 18446744073709551629 => wat}),
M1 = id(#{}),
M2 = M1#{ "hi" => "hello", int => 3, <<"key">> => <<"value">>,
4 => number, 18446744073709551629 => wat},
M0 = M2,
#{ 4 := another_number, int := 3 } = M2#{ 4 => another_number },
ok.
loop_match_and_update_literals_x_q(Map, []) -> Map;
loop_match_and_update_literals_x_q(#{q:=Q0,x:=X0} = Map, [{X,Q}|Vs]) ->
loop_match_and_update_literals_x_q(Map#{q=>Q0+Q,x=>X0+X},Vs).
%% Use this function to avoid compile-time evaluation of an expression.
id(I) -> I.
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