评估数组是否包含ruby中的任何项目

evaluate if array has any items in ruby

有没有更好的申报方法？

1	if current_user.received_replies.unread.count > 0

我要做的是匹配条件，前提是至少有一个unread对象。

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unless current_user.received_replies.unread.empty?
# ...
end

或者，如果你有ifelse，开关的情况下(因为一个unless/elseiChange)：

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if current_user.received_replies.unread.empty?
# ...
else
# ...
end

我使用：

1	if current_user.received_replies.unread.any?

从文档：

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= Array.any?

(from ruby core)
=== Implementation from Enumerable
------------------------------------------------------------------------------
enum.any? [{|obj| block } ] -> true or false

------------------------------------------------------------------------------

Passes each element of the collection to the given block. The method returns
true if the block ever returns a value other than false or nil. If the block
is not given, Ruby adds an implicit block of {|obj| obj} (that is any? will
return true if at least one of the collection members is not false or nil.

%w{ant bear cat}.any? {|word| word.length >= 3} #=> true
%w{ant bear cat}.any? {|word| word.length >= 4} #=> true
[ nil, true, 99 ].any? #=> true