Write a method smallest_integer which takes as its input an Array of integers and returns the smallest integer in the Array. For example: smallest_integer([1, 2, 3]) # => 1 smallest_integer([0, -10, 10]) # => -10 smallest_integer([-10, -20, -30]) # => -30 If the input Array is empty smallest_integer should return nil.

Find the smallest integer in an array

# smallest_integer is a method that takes an array of integers as its input
# and returns the smallest integer in the array
#
# +array+ is an array of integers
# smallest_integer(array) should return the smallest integer in +array+
#
# If +array+ is empty the method should return nil
def smallest_integer(array)
  min = nil
  array.each do |x|
    if min.nil? || min > x 
      min = x
    end
  end
  
  min
end