ruby - Ruby - 从数组中删除一个值

Question

当我尝试从数组中删除一个值并使用相同的数组对象映射以创建新数组但它无法正常工作时出现错误未定义的方法“删除”。

@test = ["ab","cd","ef"]
@test.map.delete("ab")

NoMethodError（未定义的方法“删除”#）

标签： rubyruby-on-rails-3ruby-on-rails-5

Answer 1

您也可以使用tap尝试此操作，

irb(main):009:0> test = ["ab","cd","ef"]
=> ["ab", "cd", "ef"]
irb(main):010:0> test.tap {|i| i.delete("ab")}
=> ["cd", "ef"]

或者

irb(main):019:0> test = ["ab","cd","ef"]
=> ["ab", "cd", "ef"]
irb(main):020:0> test -= ["ab"]
=> ["cd", "ef"]

或者你可以使用delete_if

irb(main):031:0> @test = ["ab","cd","ef"]
=> ["ab", "cd", "ef"]
irb(main):032:0> @test.delete_if{|i|i=="ab"}
=> ["cd", "ef"]
irb(main):033:0> @test
=> ["cd", "ef"]