dry-rb - dry-initializer

• optional attributes and default values

optional attributes and default values

1. http://dry-rb.org/gems/dry-initializer/optionals-and-defaults

• optional attribute

  # option can be not specified at all
  option :foo, Types::Strict::String, optional: true
  

• default value

  when using default key, optional: true is implied:

  # equivalent to `Types::Strict::String, optional: true`
  option :foo, Types::Strict::String, default: proc { nil }
  option :foo, Types::Strict::String, default: proc { 'bar' }
  

  NOTE: the last example is not equivalent to:

  option :foo, Types::Strict::String.default('bar'), optional: true
  

  such usage is incorrect - when option is not specified, it will be nil.