darrencauthon / add-up-to-100 Goto Github PK

def next_options_for number, statement = nil
  next_number = number + 1
  statement   = number unless statement
  [
    "#{statement}#{next_number}",
    "#{statement} + #{next_number}",
    "#{statement} - #{next_number}",
  ].map do |x|
    {
      number:      number,
      next_number: next_number,
      statement:   x,
      value:       eval(x),
    }
  end
end

results = next_options_for 1
7.times { results = results.map { |o| next_options_for o[:next_number], o[:statement] }.flatten }
results.select { |x| x[:value] == 100 }
       .map    { |x| x[:statement] }