felixfrank

def next_row row
  ([0] + row).zip(row + [0]).collect do |l, r|
     l + r
  end
end

def pascal n
  ([nil] * n).inject([1]) do |row, y|
    y = next_row row
  end

felixfrank

def next_row row
  ([0] + row).zip(row + [0]).collect do |l, r|
     l + r
  end
end

def pascal n
  ([nil] * n).inject([1]) do |row, y|
    y = next_row row
  end