CODEWITHSUNDEEP
erlangerl
emzemzx
emzemzx

Reputation: 165

check for item in list in Erlang

I'm trying to make check function in Erlang I have one word and list of word

list_word() ->
     ["bad1", "bad2", "bad3"].

And I'm trying to check if this word in list return true except return false

example :

check_list() ->
    badword = list_word(),
    if "bad1" == badword ->
        %% do some thing

in this case first word in list but second word not and I wan't it to return true

check_list() ->
    badword = list_word(),
    if "bad1 test" == badword ->
        %% do some thing

how can I do it ?

Upvotes: 1

Views: 4160

Answers (1)

Hynek -Pichi- Vychodil
Hynek -Pichi- Vychodil

Reputation: 26121

Look at lists:member/2 — it is implemented as a BIF so it's very fast.

case lists:member("bad1", list_word()) of
    true ->
        %% do something
        ;
    false ->
        ok
end.

Edit: For your second example you can do something like:

Words = list_word(),
Found = fun(Word) -> lists:member(Word, Words) end,
BadWords = string:tokens("bad1 test", " "),
case lists:any(Found, BadWords) of
    true ->
        %% do something
        ;
    false ->
        ok
end.

Upvotes: 2

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