Given these 3 pieces of information:

• An advisor's name
• The domain name of the company he works for
• A set of name's and emails of other advisors that work for the same company

For this scenario there are 4 potential patterns

1. first_name_dot_last_name: "[email protected]"
2. first_name_dot_last_initial: "[email protected]"
3. first_initial_dot_last_name: "[email protected]"
4. first_initial_dot_last_initial: "[email protected]"

And given a sample dataset:

{
  "John Ferguson" => "[email protected]",
  "Damon Aw" => "[email protected]",
  "Linda Li" => "[email protected]",
  "Larry Page" => "[email protected]",
  "Sergey Brin" => "[email protected]",
  "Steve Jobs" => "[email protected]"
}

We have to work out the most likely email address for the following:

1. "Peter Wong", "alphasights.com"
2. "Craig Silverstein", "google.com"
3. "Steve Wozniak", "apple.com"
4. "Barack Obama", "whitehouse.gov"

To run the test-suite that covers all 4 occurrences

$ bundle exec rspec

To log into the application's console, set CONSOLE to true when running the test suite

$ CONSOLE=true bundle exec rspec

which will boot pry with the app loaded. Sample execution:

prediction = EmailPredictor::Prediction.new("Peter Wong", "alphasights.com")
=> #<EmailPredictor::Prediction:0x00000101e295f8
 @domain=#<EmailPredictor::Domain:0x00000101e29580 @full_domain="alphasights.com">,
 @name=#<EmailPredictor::Name:0x00000101e295a8 @full_name="Peter Wong">>

email = prediction.predicted_email
=> #<EmailPredictor::PredictedEmail:0x00000101d2c2e0 @address="[email protected]", @pattern=:first_name_dot_last_name>

email.address
=> "[email protected]"
email.pattern
=> :first_name_dot_last_name

• For predominant patterns: the pattern used will always be the one with more ocurrences on the database

• For multiple non-predominant patterns: any of them is used

• For no previous pattern found a NotImplementedError is raised.