Ruby OpenStruct.delete_field用法及代碼示例

delete_field(name) { || ... }

從對象中刪除命名字段並返回字段包含的值(如果已定義)。您可以選擇提供一個塊。如果未定義該字段，則返回塊的結果，或者如果沒有給出塊，則會引發 NameError 。

require "ostruct"

person = OpenStruct.new(name: "John", age: 70, pension: 300)

person.delete_field!("age")  # => 70
person                       # => #<OpenStruct name="John", pension=300>

將值設置為 nil 不會刪除該屬性：

person.pension = nil
person                 # => #<OpenStruct name="John", pension=nil>

person.delete_field('number')  # => NameError

person.delete_field('number') { 8675_309 } # => 8675309