class Array

Public Instance Methods

one_factorize() click to toggle source

# File lib/one_factorization/array.rb, line 2
def one_factorize
  number_pairs = length / 2
  first, *rest = *self
  result = rest.each_with_index.inject([]) do |set, (person,index)|
    set << (1..number_pairs-1).inject([[first, person]]) do |pairs, offset|
      pairs << [rest[(index-offset)%rest.length], rest[(index+offset)%rest.length]]
    end
  end
  fail OneFactorization::InvalidLengthError.new(result) if length.odd?
  result
end