sort using bubblesort. Compare efficiency with array#sort method using benchmark

sort.rb

# Sort the array from lowest to highest
def bubblesort(arr)
  n = arr.length
  loop do 
    swapped = false
    (n-1).times do |i|
      if arr[i] > arr[i+1]
        arr[i], arr[i+1] = arr[i+1], arr[i]
        swapped = true
      end
    end
    break if not swapped
  end
    arr
end

# Find the maximum 
def maximum(arr)
  bubblesort(arr).last
end

def minimum(arr)
  bubblesort(arr).first
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 2 below
result = minimum([2, 42, 22, 02])
puts "min 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 = minimum([])
puts "min 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}"

require 'benchmark'
puts Benchmark.measure {bubblesort [2, 42, 22, 02]}   
puts Benchmark.measure {[2, 42, 22, 02].sort}