Ruby/Hash/reject
Материал из Wiki.crossplatform.ru
reject and delete from hash with block
h = {:a=>1, :b=>2, :c=>3, :d=>"four"} h.reject! {|k,v| v.is_a? String } # => {:a=>1, :b=>2, :c=>3 } h.delete_if {|k,v| k.to_s < "b" } # => {:b=>2, :c=>3 } h.reject! {|k,v| k.to_s < "b" } # => nil: no change h.delete_if {|k,v| k.to_s < "b" } # => {:b=>2, :c=>3 }: unchanged hash h.reject {|k,v| true } # => {}: h is unchanged
