gistfile1.rb

# Find the maximum 
def maximum(arr = 0)
  #arr.max #Initial code (lighthouse code)
max_value = arr[0] 

max_value = 0 if arr[0] == nil #Avoid empty array, makes answer zero

  arr.each do |i|
    max_value = i if (max_value <= i)
  end
  
  max_value
end

result = maximum([])
puts "Max of empty array #{result}"
# expect it to return 42 below
result = maximum([-1, -2, -3, -4])
puts "max of -1, -2, -3, -4 is: #{result}"

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}"