gistfile1.txt

# http://blog.jazzychad.net/2012/08/01/array-iteration-problem.html
def argh(arr, val, n)
  # change to arr2 = arr if you want to change the array in place
  arr2 = arr.dup
  tmp_range = (0..arr2.length)
  tmp_range = n < 0 ? (n..arr2.length) : (0..(n-1)) unless n == 0
  tmp = []
  arr2.each_with_index { |v, i| tmp << [v, i] if v == val }
  tmp[tmp_range].map! { |v| v[0] += val }
  tmp.each { |v| arr2[v[1]] = v[0] }
  arr2
end