3 char combinations (of my name)

combinations.rb

# try pairs of 2
def pairs_of_2(names)
  slices = names.join.scan(/.{2}/)
  combinations(slices)
end

# try each chars
def pairs_of_chars(names)
  chars = names.join.chars.to_a.uniq
  combinations(combinations(chars))
end

def combinations(slices)
  slices.product(slices).map {|x| x.join[0..2]}.uniq
end

names = %w(alexis reigel)

#puts pairs_of_2 names
puts pairs_of_chars names