如何检查Erlang中是否有许多字符串不为空？

Question

我有S1,S2而且S3,我想做一些像:

if S1 != "" and S2 != "" and S3 != "" then do something.

Answer 1

如果所有必须为空,您可以执行某些操作,

case {S1,S2,S3} of
    {[],[],[]} -> %% empty
    _ -> %% not empty
end.

如果你需要知道哪一个是空的

case {S1,S2,S3} of
    {[],[],[]} -> %% empty
    {[],_,_} -> %% S1 empty
    {_,[],_} -> %% S2 empty
    {_,_,[]} -> %% S3 empty
end.

清洁代码!!
编辑

case lists:member(true,[Each =:= []  || Each <- [S1,S2,S3]]) of
    true -> 
        %% atleast one of them is empty
    false -> 
        %% all are not empty
end.