Maximum Value

MAX VALUE.rb

# Find the maximum 

def maximum(arr)

# Setting the value as max value at first
  max_value = arr.first
# For each value in the array the highest value would be x if x is higher than the first value
  arr.each{|x| max_value = x if x > max_value}
  max_value
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}"