client/src/data/problemCheck.js

   1 export function checkProblem(p) {
   2   const vid = parseInt(p.vid, 10);
   3   if (isNaN(vid) || vid <= 0) return "Please select a variant";
   4
   5   if (!V.IsGoodFen(p.fen)) return "Errors in FEN";
   6
   7   if (p.instruction.trim().length == 0) return "Missing instructions";
   8
   9   if (p.solution.trim().length == 0) return "Missing solution";
  10
  11   return "";
  12 }