在散列數組中，如何刪除 ruby​​ 中某個鍵具有特定值的元素？

Question

在散列數組中如何刪除具有特定鍵值的元素？

例如：

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

我需要編寫一個最小且高效的 ruby​​ 腳本，該腳本從數組中刪除所有元素，這些元素將“No”作為鍵“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

如果您不想改變原始數組，則可以使用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"}]