CachingEnumerator

A caching wrapper for Enumerator

Add this line to your application's Gemfile:

gem 'caching_enumerator'

And then execute:

$ bundle

Or install it yourself as:

$ gem install caching_enumerator

require 'caching_enumerator'

enum = CachingEnumerator.new do |yielder|
  5.times do |i|
    puts "very expensive operation #{i}"
    yielder.yield i
  end
end

enum.take 2
# very expensive operation 0
# very expensive operation 1
# => [0, 1]

enum.take 3
# very expensive operation 2
# => [0, 1, 2]

enum.next
# => 0

enum.next
# => 1

enum.next
# => 2

enum.next
# very expensive operation 3
# => 3

enum.rewind.next
# => 0

# calling `reset` will clear the cache and rewind the internal pointers
enum.reset.next
# very expensive operation 0
# => 0

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests.

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/cyclotron3k/caching_enumerator.

The gem is available as open source under the terms of the MIT License.