using anything other than sort type of methods to run through an array and scan the highest number.

Maximum

# Find the maximum 
#Scan the array to compare integers and find the maximum 
#within that array if there are objects inside the array
#otherwise set it to nil.

def maximum(arr)
  #arr.max
  #create the sort option
  #comparing the actual number not the index using arr[i]
  itswaps = true
  while itswaps do 
  	itswaps = false
	  0.upto(arr.length-2) { |i|
	  	if arr[i] > arr[i+1] 
	  		arr[i], arr[i+1] = arr[i+1], arr[i]
	  		itswaps = true
			end
  	}
	end
  arr.last

end

# expect it to return 42 below
result = maximum([2, 42, 22, 02])
puts "max of 2, 42, 22, 02 is: #{result}"

# expect it to return nil when empty array is passed in
result = maximum([])
puts "max on empty set is: #{result.inspect}"

result = maximum([-23, 0, -3])
puts "max of -23, 0, -3 is: #{result}"

result = maximum([6])
puts "max of just 6 is: #{result}"