Making eazily initialized read-only attributes in a simple manner.
Add this line to your application's Gemfile:
gem 'attr_lazy_reader'
And then execute:
$ bundle
Or install it yourself as:
$ gem install attr_lazy_reader
It contains only one method.
It makes sym
method just like Module#attr_reader
, but it requires block.
- if instance variable
@#{sym}
exists (even if it isnil
), just return it and block is not called. - Otherwise,
block
is evaluated in instance context, set the return value to instance variable@#{sym}
, and returns the value
After checking out the repo, run bin/setup
to install dependencies. Then, run rake spec
to run the tests. You can also run bin/console
for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install
. To release a new version, update the version number in version.rb
, and then run bundle exec rake release
, which will create a git tag for the version, push git commits and tags, and push the .gem
file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/maisumakun/attr_lazy_reader.
The gem is available as open source under the terms of the MIT License.