Build Status


TStruct is type checked Struct


Add this line to your application's Gemfile:

gem 'tstruct'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install tstruct


require "tstruct"

# propaty names with Type
# Type must has `#===`
User = Integer, name: String, age: Integer)

homu =, "homu", 14)

# OK = "homuhomu"

# error: TypeError
homu.age = "14"

require "tstruct"

# Use Regexp and Range
User = Integer, name: /^h/, age: (1..20))

homu =, "homu", 14)

# error: TypeError = "mami"

# OK
homu.age = 15

# error: TypeError
homu.age = 21


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


Bug reports and pull requests are welcome on GitHub at