はてなブックマーク

The most interesting addition to Ruby 2.3.0 is the Safe Navigation Operator(&.). A similar operator has been present in C# and Groovy for a long time with a slightly different syntax - ?.. So what does it do? TLDR It is used for avoiding NoMethodError exceptions when calling methods on objects that may be nil. account = nil account.number # => NoMethodError (undefined method `number' for nil:NilCl