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An implementation of the maybe monad.



gem 'maybelline'


require 'maybelline'


Say you have some objects like the ones below:

require 'ostruct'

data = {
  "neat" => {
    "super" => "cool",
    "lame"  => nil

object =
object.neat =

If any method in the chain of calls returns nil, the block will return nil.

Maybe(data){|d| d["this_key_doesnt_exist"]["this_key_wont_get_called"]} #=> nil
data.maybe{|d| d["this_key_doesnt_exist"]["this_key_wont_get_called"]}  #=> nil
object.maybe{|o| o.neat.lame.this_method_never_gets_called}             #=> nil

If it is successful, it will return the value.

data.maybe{|d| d["neat"]["super"]}  #=> "cool"
object.maybe{|o| o.neat.super}      #=> "cool"

Note on Reporting Issues

  • Try to make a failing test case
  • Tell me which version of ruby you're using
  • Tell me which OS you are using
  • Provide me with any extra files if necessary

Note on Patches/Pull Requests

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.