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-module(take). | |
-export([take/2, test_take/0]). | |
% Define a function take that takes the first N elements from a list. Here are some examples of take in action: | |
% take(0,"hello") = [] | |
% take(4,"hello") = "hell" | |
% take(5,"hello") = "hello" | |
% take(9,"hello") = "hello" | |
-spec take(non_neg_integer(), [T]) -> [T]. | |
-spec take_worker(non_neg_integer(), non_neg_integer(), [T], [T]) -> [T]. | |
take(Max, L) -> | |
take_worker(0, Max, L, []). | |
% lists:reverse(take_worker(0, Max, L, [])). | |
take_worker(Min, Min, _L, Result) -> | |
Result; | |
take_worker(Min, Max, [H|T], Result) -> | |
take_worker(Min + 1, Max, T, Result ++ [H]). | |
% take_worker(Min + 1, Max, T, [H|Result]). | |
test_take() -> | |
take(0, "Pradeep") == [], | |
take(1, "P") == "P", | |
take(2, "Pr") == "Pr", | |
success. |
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