Function diffSets

scripts/kernel-parity.mjs:160–176

(aList, bList)

}

function diffSets(aList, bList) {
  const a = new Map(); // canon -> count (multiset — duplicates matter)
  const b = new Map();
  for (const x of aList) a.set(x, (a.get(x) ?? 0) + 1);
  for (const x of bList) b.set(x, (b.get(x) ?? 0) + 1);
  const onlyA = [];
  const onlyB = [];
  for (const [k, c] of a) {
    const d = c - (b.get(k) ?? 0);
    for (let i = 0; i < d; i++) onlyA.push(k);
  }
  for (const [k, c] of b) {
    const d = c - (a.get(k) ?? 0);
    for (let i = 0; i < d; i++) onlyB.push(k);
  }
  return { onlyA, onlyB };
}

// --- run ----------------------------------------------------------------------
const buckets = new Map(); // category -> {count, samples[]}