使用拒绝:

>> cities = ["Kathmandu", "Pokhara", "", "Dharan", "Butwal"].reject{ |e| e.empty? }
=> ["Kathmandu", "Pokhara", "Dharan", "Butwal"]

在我的项目中，我使用delete:

cities.delete("")

如果你的数组中有混合类型，下面是一个解决方案:

[nil,"some string here","",4,3,2]

解决方案:

[nil,"some string here","",4,3,2].compact.reject{|r| r.empty? if r.class == String}

输出:

=> ["some string here", 4, 3, 2]

compact_blank (Rails 6.1+)

如果您正在使用Rails(或独立的ActiveSupport)，从6.1版开始，将有一个compact_blank方法从数组中删除空白值。

它使用Object#blank?用于确定一个项目是否为空白。

["Kathmandu", "Pokhara", "", "Dharan", nil, "Butwal"].compact_blank
# => ["Kathmandu", "Pokhara", "Dharan", "Butwal"]

[1, "", nil, 2, " ", [], {}, false, true].compact_blank
# => [1, 2, true]

这里有一个文档链接和一个相关PR链接。

破坏性的变种也是可用的。# compact_blank !看到数组。

如果您使用的是较旧版本的Rails，请检查compact_blank内部实现。

反向移植并不复杂。

def compact_blank
  reject(&:blank?)
end

如果你只需要删除nil值，可以考虑使用Ruby内置的Array#compact和Array#compact!方法。

["a", nil, "b", nil, "c", nil].compact
# => ["a", "b", "c"]

cities.reject! { |c| c.blank? }

为什么要用空白?在空的吗?blank可以识别nil，空字符串和空白。例如:

cities = ["Kathmandu", "Pokhara", " ", nil, "", "Dharan", "Butwal"].reject { |c| c.blank? }

仍然会返回:

["Kathmandu", "Pokhara", "Dharan", "Butwal"]

叫空?On " "将返回false，您可能希望它为true。

注:空白?只能通过Rails访问，Ruby只支持空?

使用严格的join & split更新

cities = ["Kathmandu", "Pokhara", "", "Dharan", "Butwal"]
cities.join(' ').split

结果将是:

["Kathmandu", "Pokhara", "Dharan", "Butwal"]

注意:这对有空间的城市不起作用