在散列数组中，如何删除 ruby​​ 中某个键具有特定值的元素？

Question

在散列数组中如何删除具有特定键值的元素？

例如：

array = [ {"lang"=> 'Ruby', "is_using"=> "Yes"}, { "lang"=> "Go", "is_using" => "No"}, {"lang"=> "Rust", "is_using"=> "No"} ]

我需要编写一个最小且高效的 ruby​​ 脚本，该脚本从数组中删除所有元素，这些元素将“No”作为键“is_using”的值。

Answer 1

使用Array#delete_if ：

array = [ {"lang"=> 'Ruby', "is_using"=> "Yes"}, { "lang"=> "Go", "is_using" => "No"}, {"lang"=> "Rust", "is_using"=> "No"} ]
array.delete_if { |hash| hash['is_using'] == 'No' }
#=> [{ "lang" => "Ruby", "is_using" => "Yes" }]

Answer 2

如果您不想改变原始数组，则可以使用reject ：

array = [{ "lang"=> 'Ruby', "is_using"=> "Yes" },
         { "lang"=> "Go", "is_using" => "No" },
         { "lang"=> "Rust", "is_using"=> "No" }]

array.reject { |h| h["is_using"].eql?('Yes') }
# [{"lang"=>"Go", "is_using"=>"No"}, {"lang"=>"Rust", "is_using"=>"No"}]