Selection Sort program in ruby

selection_sort.rb

# selection_sort.rb
#
# $ ruby selection_sort.rb
# [1, 2, 3, 4, 5, 6, 7, 8]

def selection_sort(array)
  n = array.length-1
  for i in 0..n-1
    min = i
    j = i + 1
    for j in j..n
      if array[min] > array[j]
        min = j
      end
    end
    if i != min
      array[i],array[min] = array[min],array[i]
    end
  end
end

array = [6,5,3,1,8,7,2,4]
selection_sort array
print array