How could I DRY this while loop?

Question

I need to DRY this code but I don't know how.

I tried to dry the if condition but I don't know how to put the while in this.

def sum_with_while(min, max)
  # CONSTRAINT: you should use a while..end structure
  array = (min..max).to_a
  sum = 0
  count = 0
  if min > max
    return -1
  else
    while count < array.length
      sum += array[count]
      count += 1
    end
  end

  return sum
end

Answer 1

This is one option, cleaning up your code, see comments:

def sum_with_while(range) # pass a range
  array = range.to_a
  sum, count = 0, 0 # parallel assignment
  while count < array.length
    sum += array[count]
    count += 1
  end
  sum # no need to return
end


sum_with_while(10..20)
#=> 165

---

More Rubyish:

(min..max).sum