Problem Statement

JortSort is a sorting tool set that makes the user do the work and guarantees efficiency because you don't have to sort ever again. It was originally presented by Jenn "Moneydollars" Schiffer at the prestigious   JSConf.

JortSort is a function that takes a single array of comparable objects as its argument. It then sorts the array in ascending order and compares the sorted array to the originally provided array. If the arrays match   (i.e. the original array was already sorted),   the function returns   true. If the arrays do not match (i.e. the original array was not sorted), the function returns   false.

Let's start with the solution:

(defun jort-sort (x) 
  (equalp x (sort (copy-seq x) #'<)))