Randomly Shuffle Enumerated list using enumerate package

Question

I am building a template for writing exams, and I'd like to randomly shuffle my enumerated lists at compile time. The answers to this question worked for that purpose, however I am using other functions to be able to switch between a 'Student View' and a view of the 'Key', and the solutions provided doesn't work with the functionality of the enumerate package which I used when constructing my other functionality.

Here is an MWE, without the randomize functionality

\documentclass{article}
\usepackage[dvipsnames]{xcolor}
\usepackage{amsmath, enumerate, ifthen, multicol, tikz}
\newif\ifgrading
\newcommand*\circleAns[1]{\tikz[baseline=(char.base)]{
            \node[shape=circle,draw,inner sep=2pt,color=ForestGreen] (char) {#1};}}
\makeatletter

\newcommand{\itemAns}{
    \ifgrading
        \stepcounter{enum\romannumeral@enumdepth}
        \item[\circleAns{\textcolor{ForestGreen}{@nameuse{label@enumctr}}}]
    \else \item
    \fi
}
\makeatother
\begin{document}
\begin{multicols}{2}
\gradingtrue
\begin{enumerate}[a)]
    \itemAns
    \item 
    \item
\end{enumerate}
\gradingfalse
\begin{enumerate}[a)]
    \itemAns
    \item 
    \item
\end{enumerate}
\end{multicols}
\end{document}

Producing the output:

Ideally, the randomization functionality would allow me to continue using both \begin{enumerate}[<options>] and \itemAns, and would also allow me to set a seed for the random generation process for repeatability. Thank you in advance for your assistance.

I answered a similar question before. Does it help? https://tex.stackexchange.com/questions/566202/could-i-do-a-different-automatic-exam-copies-one-for-each-student/566247#566247 — Alan Xiang, Nov 15 '20 at 22:42
Alan, thank you for your comment, it was helpful to see, though I will be implementing egreg's solution. — Shaun, Nov 16 '20 at 21:25

score 1 · Accepted Answer · answered Nov 16 '20 at 00:13

Here's how you can shuffle the answers in a repeatable way, by fixing the seed. Devise a formula based on the student number to be fed as the seed.

\documentclass{article}
%\usepackage{xparse} % not needed with LaTeX 2020-10-01 or later
\usepackage{enumitem} % much more powerful than enumerate
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
\newcommand*\circleanswer[1]{%
  \smash{\tikz[baseline=(char.base)]{%
    \node[shape=circle,draw,inner sep=2pt,color=ForestGreen] (char) {#1};
  }}%
}
\ExplSyntaxOn
\sys_gset_rand_seed:n { 43221+32 } % a fixed number + the student number
\NewDocumentEnvironment{answers}{+b}
 {
  \begin{enumerate}[label=__shaun_answers_maybecorrect:n {\alph*})]
  \shaun_answers:n { #1 }
  \end{enumerate}
 }{}
\NewDocumentCommand{\grading}{}
 {
  \bool_gset_true:N \g_shaun_answers_grading_bool
 }
\NewDocumentCommand{\notgrading}{}
 {
  \bool_gset_false:N \g_shaun_answers_grading_bool
 }
\seq_new:N \l__shaun_answers_seq
\bool_new:N \l__shaun_answers_correct_bool
\bool_new:N \g_shaun_answers_grading_bool
\cs_new_protected:Nn \shaun_answers:n
 {
  \seq_set_split:Nnn \l__shaun_answers_seq { \item } { #1 }
  \seq_pop_left:NN \l__shaun_answers_seq \l_tmpa_tl
  \seq_shuffle:N \l__shaun_answers_seq
  \exp_last_unbraced:Ne __shaun_answers_item:
   { \seq_use:Nn \l__shaun_answers_seq { __shaun_answers_item: } }
 }
\cs_new_protected:Nn __shaun_answers_item:
 {
  \peek_charcode_remove:NTF +
   { \bool_set_true:N \l__shaun_answers_correct_bool \item }
   { \bool_set_false:N \l__shaun_answers_correct_bool \item }
 }
\cs_new_protected:Nn __shaun_answers_maybecorrect:n
 {
  \bool_if:NTF \l__shaun_answers_correct_bool
   {
    \bool_if:NTF \g_shaun_answers_grading_bool { \circleanswer{#1} } { #1 }
   }
   {
    #1
   }
 }
\ExplSyntaxOff
\begin{document}
%\grading
\notgrading
\subsection*{First question}
\begin{answers}
\item+ Correct
\item Incorrect (1)
\item Incorrect (2)
\item Incorrect (3)
\end{answers}
\subsection*{Second question}
\begin{answers}
\item+ Correct
\item Incorrect (1)
\item Incorrect (2)
\item Incorrect (3)
\end{answers}
\end{document}

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Thank you for your very elegant solution (as well as for including my name in your solution, it was a very nice touch) — Shaun, Nov 16 '20 at 20:57
@Shaun expl3 functions and variables should always start with a “unique” prefix in order to avoid clashes with other people's code. I often use as prefix the nickname of the person who asked for the code, if possible. — egreg, Nov 16 '20 at 21:14
I am having one problem where I am trying to reference to the answer item using \label{} and \ref{} and I am receiving errors. Would you have any suggestions for implementing this functionality? — Shaun, Nov 17 '20 at 00:24

Randomly Shuffle Enumerated list using enumerate package

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