Created
May 13, 2020 17:37
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-module('chapter-5'). | |
-export([map_search_pred/2]). | |
% write a funciton map_search(Map, Pred) that returns the first element {Key, Value} | |
% in the map for which Pred(Key, Value) is true. | |
% 16> A = fun(X, Y) -> case X > Y of true -> true; _ -> false end end. | |
% #Fun<erl_eval.13.126501267> | |
% 17> A(1, 2). | |
% false | |
% 18> 'chapter-5':map_search_pred(#{1=>2, 4=>3}, A). | |
% {4,3} | |
% 19> | |
map_search_pred(Map, Pred) -> | |
map_search(maps:to_list(Map), Pred). | |
map_search([], _Pred) -> | |
[]; | |
map_search([H|T], Pred) -> | |
{Key, Value} = H, | |
case Pred(Key, Value) of | |
true -> {Key, Value}; | |
_ -> map_search(T, Pred) | |
end. | |
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