Invite people to a Secret Santa without you knowing who draws whom (sketch)

secret_santa.rb

#!/usr/bin/env ruby

participants = [
  { :name => "Santa",    :email => "santa@north.mas" },
  { :name => "Rudolf",   :email => "rednose@north.mas" },
  { :name => "Ruprecht", :email => "knecht77@north.mas" }
]

def assign_gifts(folks)
  perm = (0...folks.size).to_a.shuffle

  perm.zip(perm.rotate(1)).each { |pair|
    send_mail(folks[pair[0]][:email], folks[pair[1]][:name])
  }
end

def send_mail(to, gift_to)
  puts "Tell #{to} to prepare a 🔒-🎅 🎁 for #{gift_to}"
  # Real implementation e.g. with:  https://jerodsanto.net/2009/02/a-simple-ruby-method-to-send-emai/
end

assign_gifts(participants)