Bsearch p2

bsearch_part_2.rb

arr = [ 1, 1, 2, 3, 5, 8, 13, 21, 34 ] 

res = arr.bsearch do |val| 
  case when val < 19 
  then +1 when val > 23 
  then -1 
  else 0 
  end
end 
res # => 21