Pascal's Triangle in Ruby

Question

I am writing Pascal's triangle in Ruby, but keep getting the error message:

pascalsTriangle.rb:3:in 'triangle': undefined method `each' for 4:Fixnum (NoMethodError)
from pascalsTriangle.rb:18

def triangle(n)
  for r in n:
    lst=[1]
    term=1
    k=0
    (0..r+1).step(1){ |index|
      term=term*(r-k+1)/k
      lst.append(term)
      k+=1
    }
    print lst
  end
end

triangle(4)

Answer 1

the final source code:

def triangle(n)
    (0..n).each{|r|
            lst=[1]
            term=1
            k=1
            (0..r-1).step(1){|index|
                    term=term*(r-k+1)/k
                    lst.push term 
                    k+=1
            }
            p lst
    }
end
triangle(4)

changes:

1. you have syntax error on for r in n:.
2. a logical error on k=0 that causes Division by zero.
3. (0..r+1) is changed to (0..r-1)
4. there is no append method for array. changed to push
5. p is used instead of print