Created
May 15, 2020 16:29
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-module(lst). | |
-export([ | |
take/2, | |
reverse/1, | |
palindrome/1, | |
remove/2, | |
nub/1 | |
]). | |
%% | |
%% take(N, L) -> return the N first elements of the list L | |
%% | |
take(0, _L) -> []; | |
take(_N, []) -> []; | |
take(N, [X|Xs]) when N > 0 -> | |
[X | take(N-1, Xs)]. | |
%% | |
%% reverse | |
%% | |
reverse([]) -> []; | |
reverse([X|Xs]) -> reverse(Xs) ++ [X]. | |
%% | |
%% palindrome | |
%% | |
palindrome(X) -> X =:= reverse(X). | |
%% | |
%% remove(I,L) -> remove all occurrencies of X in L. | |
%% | |
remove(_X, []) -> []; | |
remove(X, [X|Xs]) -> remove(X,Xs); | |
remove(X, [Y|Xs]) -> [Y | remove(X,Xs)]. | |
%% | |
%% nub(L) | |
%% | |
nub([]) -> []; | |
nub([X|Xs]) -> [X|nub(remove(X,Xs))]. |
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