Lalka
Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file lib/lalka
. To experiment with that code, run bin/console
for an interactive prompt.
TODO: Delete this and the text above, and describe your gem
Usage
Create:
task = Lalka::Task.new do |t| # block is not executed untill fork or fork_wait is called
t.resolve(value) # resolve task to a value
# or
t.reject(error) # reject task with an error
# or
t.try { 100 } # will resolve
# or
t.try { raise 'error' } # will reject
end
Create with predefined state:
resolved_task = Lalka::Task.resolve(value) # task which resolves to a value
rejected_task = Lalka::Task.reject(error) # task which rejects to a value
task = Lalka::Task.try { 100 } # will resolve
task = Lalka::Task.try { raise 'error' } # will reject
fork:
# executes computation, fork is nonblocking, returns nil
task.fork do |t|
t.on_success do |value|
# do something with a value
end
t.on_error do |error|
# handle error
end
end
fork_wait:
# executes computation, fork_wait blocks and returns Either from "dry-monads" gem
task = Lalka::Task.resolve(99)
result = task.fork_wait do |t|
t.on_success do |value|
value + 1
end
t.on_error do |error|
# ...
end
end
result # Right(100)
task = Lalka::Task.reject('error')
result = task.fork_wait do |t|
t.on_success do |value|
# ...
end
t.on_error do |error|
"Error: " + error
end
end
result # Left("Error: error")
map:
task = Lalka::Task.resolve(99).map { |v| v + 1 }.map { |v| v.to_s + "!" }
result = task.fork_wait
result # Right("100!")
task = Lalka::Task.reject('error').map { |v| v + 1 }.map { |v| v.to_s + "!" }
result = task.fork_wait
result # Left("error")
bind:
task = Lalka::Task.resolve(99).bind { |v| Lalka::Task.resolve(v + 1) }
result = task.fork_wait
result # Right(100)
ap:
task = Lalka::Task.resolve(-> (v) { v + 1 }).ap(Lalka::Task.resolve(99))
result = task.fork_wait
result # Right(100)
task1 = Lalka::Task.resolve(99)
task2 = Lalka::Task.resolve(1)
result = task1.map { |x| -> (y) { x + y } }.ap(task2).fork_wait
result # Right(100)
result = Lalka::Task.resolve(-> (x) { -> (y) { x + y } }).ap(task1).ap(task2).fork_wait
result # Right(100)
result = Lalka::Task.resolve(-> (x, y) { x + y }.curry).ap(task1).ap(task2).fork_wait
result # Right(100)
Installation
Add this line to your application's Gemfile:
gem 'lalka'
And then execute:
$ bundle
Or install it yourself as:
$ gem install lalka
Usage
TODO: Write usage instructions here
Development
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.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/lalka. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
License
The gem is available as open source under the terms of the MIT License.