Maximum Value

max.rb

# Find the maximum
def maximum(arr)

  # My first method... Uses 0 as a default value, so
  # kind of doesn't work for an array full of elements
  # that are less than zero.
  y = 0
  arr.each do |x|
    if x > y
      y = x
    end
  end
    return y

  # Second way using "inject" -> No default value; returns nil
  # for empty array. Also looks succinct and pretty.
  #arr.inject{|y,x| x > y ? x : y}
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, -1, -3])
puts "max of -23, -1, -3 is: #{result}"

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