Function mapEquiv

lib/internal/util/comparisons.js:878–921

(a, b, mode, memo)

}

function mapEquiv(a, b, mode, memo) {
  let array;

  for (const { 0: key2, 1: item2 } of b) {
    if (typeof key2 === 'object' && key2 !== null) {
      if (array === undefined) {
        if (a.size === 1) {
          const { 0: key1, 1: item1 } = a.entries().next().value;
          return innerDeepEqual(key1, key2, mode, memo) &&
                  innerDeepEqual(item1, item2, mode, memo);
        }
        array = [];
      }
      array.push(key2);
    } else {
      // By directly retrieving the value we prevent another b.has(key2) check in
      // almost all possible cases.
      const item1 = a.get(key2);
      if (((item1 === undefined && !a.has(key2)) ||
          !innerDeepEqual(item1, item2, mode, memo))) {
        if (mode !== kLoose)
          return false;
        // Fast path to detect missing string, symbol, undefined and null
        // keys.
        if (!mapMightHaveLoosePrim(a, b, key2, item2, memo))
          return false;
        if (array === undefined) {
          array = [];
        }
        array.push(key2);
      }
    }
  }

  if (array === undefined) {
    return true;
  }

  if (mode === kPartial) {
    return partialObjectMapEquiv(array, a, b, mode, memo);
  }

  return mapObjectEquiv(array, a, b, mode, memo);
}

function partialSparseArrayEquiv(a, b, mode, memos, startA, startB) {
  let aPos = startA;