ruby - 从 Rails 中的散列中删除多个键值对

Question

number = {:a => 1, :b => 2, :c => 3, :d => 4}

根据某些条件的评估，我想删除 a,b,c 的键值对

Answer 1

number.delete "A"
number.delete "B"
number.delete "C"

或者，性能较差但更简洁:

number.reject! {|k, v| %w"A B C".include? k }