[erlang-questions] list comprehensions speed
Oleg
lego12239@REDACTED
Tue Feb 25 14:08:52 CET 2014
Hello.
I'm erlang newbie. Don't beat me, please :-), if this question is obvious.
I have a list of key-value pairs:
A=[{"name1", 1}, {"name2", 77}, {"name3", 33}, {"name4", 234}].
What is faster:
[ Value || {Name, Value} <- A, string:equal(Name, "name3")].
Or:
get_value(Key, []) ->
[].
get_value(Key, [H|T]) ->
{Name, Value} = H,
case string:equal(Name, Key) of
true ->
[Value];
false ->
get_value(Key, T)
end.
start() ->
get_value("name3", A).
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