简单的列表解析

简单的列表解析[{"aa",2},{"bb",3},{"aa",3}...],把后面为3的都取出来

1> [{A, B} || {A, B} <- [{"aa", 2}, {"bb", 3}, {"aa", 3}], B == 3].
[{"bb",3},{"aa",3}]

lists:filter(fun(Elem)-> 
	if
		element(2, Elem) == 3 -> true;
		true -> false
	end
end, [{"aa",2}, {"bb",3}]).

题目来源：http://blog.youkuaiyun.com/d52787790/article/details/7357318