Flattening an array in ruby is easy too! Your friend again is splat and recursion

gistfile1.txt

# I dont like to monkey-patch, so I dont add this to Array
# also, this method allows for lazy eval, something you cant
# do if you bind this to an array!
def flatten(arr, depth=Float::INFINITY)
  return arr if depth.zero?
  return arr.reduce([]) do |acc, v|
    if v.kind_of?(Array)
      acc.push(*flatten(v, depth-1))
    else
      acc.push v
    end
  end
end