example-1.rb

numbers = [1,3,5,8,10,54,99]
cards   = [5,3,4,6,2]

# get only the values where the distance is greater than 10
numbers.each_cons(2).select {|a,b| b-a>10 } #=> [[10, 54], [54, 99]]

# determine if the hand is a straight
cards.sort.each_cons(5).all? do |series| 
             series.last - series.first == 4
           end #=> true